How does HVAC scope change between the MCG Northern Stand and a new build like Optus Stadium Perth?

The Melbourne Cricket Ground Great Southern Stand (BHP-funded redevelopment) and the Northern Stand redevelopment of 2006 added hospitality tiers and broadcast space to an existing 100,000-capacity bowl on a heritage site, so HVAC integration was bounded by the existing structural grid, the existing main-switch room locations and the existing chilled-water plant capacity. Optus Stadium Perth (Multiplex 2018, Burswood) was a new-build greenfield project where the HVAC architecture was set from concept — central chilled-water plant sized for the full 60,000-seat bowl plus 70 corporate suites plus full concourse circulation plus the four restaurants, with smoke-management strategy embedded in the architectural form. New builds run sealed-seam Class A throughout, common chilled-water and condenser-water backbones, and a single BMS. Heritage redevelopments work with what is there and accept a higher leakage class in legacy ducts.

How is a stadium kitchen exhaust system designed under AS 1668.2 for 50,000 patrons at halftime?

A 50,000-capacity stadium runs 15-30 commercial kitchens, food outlets, beer halls and bars distributed across the concourse. Each commercial cookline gets a Type I hood with capture velocity 80-125 fpm under AS 1668.2 Section 9 and NFPA 96 reference, 16-gauge black steel welded liquid-tight grease ducts sloped 1:50 to a collection point, access doors every 3.5 m, fire-rated enclosure where the duct passes through occupied space, and dedicated make-up air at 70-90% of exhaust volume. Halftime exhaust spike is handled by oversize fans operating with variable-frequency-drive setback at low-event mode, so the fan delivers full nameplate during the 15-minute halftime window without sizing the entire system at peak. The discharge schedule coordinates with the spectator-bowl outdoor-air intakes to prevent re-entrainment.

Insights · Major Venues, Stadiums, Arenas, Convention Centres

Sports Stadium, Arena, Convention Centre & Exhibition Hall HVAC Duct Guide — MCG, Marvel, Optus, Suncorp, ICC Sydney, MCEC, Rod Laver Arena

An engineer-led ductwork design and procurement guide for Australian major venues — outdoor sports stadiums with 30,000 to 100,000-seat bowls, indoor arenas hosting Grand Slam tennis and arena concerts, convention centres at trade-show scale, and the multi-purpose exhibition halls that move from corporate dinner to product launch to gala in a single 24-hour window. The brief sits at the intersection of crowd ventilation, smoke management, kitchen exhaust, acoustic control and the operational reality of a building that runs at 5% occupancy for most of the year and at 100% occupancy for fourteen Saturday afternoons a season. A stadium AHU schedule sized for the average day will fail at peak; a schedule sized for peak will waste capacity for fifty weeks of the year. This guide is the long-form reference our engineers use when a major-venue HVAC duct package lands on our desk in Box Hill North VIC.

By SBKJ Engineering Team · Published May 20, 2026 · 44 min read · Reviewed by SBKJ QA & Engineering

Why major-venue ductwork is its own category

The Australian major-venue brief is the most operationally unforgiving HVAC project in the country. A 50,000-seat stadium is a building that runs empty for the majority of the year and then absorbs fifty thousand people across a 90-minute window for the home-and-away AFL or NRL season, the State of Origin, the AFL Grand Final, an A-League final, a Wallabies test, a Bledisloe Cup, an NRL Grand Final, an Ashes test, a stadium concert tour or a Royal Show event. The HVAC has to be invisible to all fifty thousand patrons in the bowl, generous enough to clear the halftime restroom and bar spike, fire-safe to AS 1668.1 smoke management for the inevitable false alarm on opening night, energy-conservative enough to defend a NABERS Energy rating against the operating-empty days, and fast enough to switch from concert-mode acoustic NC 25 in the bowl to AFL-mode NC 40 between Tuesday rehearsal and Saturday match. A convention centre brief looks calmer on paper but compresses the same demand spike into a Tuesday morning trade-show floor at thirty thousand visitors per hour, then transforms the same hall to a corporate gala dinner of three thousand by Friday night.

The major-venue problem is the simultaneous integration of three structurally different mechanical occupancies under one BMS — the stadium bowl with its open-or-retractable roof and its 90-minute crowd load, the indoor arena with its concert acoustic and its broadcast-grade dehumidification, and the convention or exhibition floor with its movable-partition reconfiguration in the four hours between events. A flagship Australian venue — Marvel Stadium Docklands, Rod Laver Arena Melbourne Park, ICC Sydney Darling Harbour, the Melbourne Exhibition and Convention Centre at Southbank — runs all three modes in some configuration on a given week, with hospitality suites and corporate boxes overlaid on top of the bowl, a media-and-broadcast precinct overlaid on top of the press box, locker rooms and player facilities overlaid on the back-of-house and a service yard that doubles as the post-event ingress for the concert truck convoy on the Sunday morning.

This guide assumes familiarity with general stadium HVAC; if you need that background first, start with the stadium and sports venue HVAC duct guide. For the convention scope see the convention centre and exhibition hall HVAC duct guide. For the kitchen-exhaust scope see the commercial kitchen exhaust HVAC duct guide. For the broadcast and media scope see the broadcasting TV and radio studio HVAC duct guide. For the concert and performance scope see the concert hall and performing arts centre HVAC duct guide. This guide is the integration layer that ties stadium bowl, indoor arena, convention floor, exhibition hall and the major-venue operational reality together at the brief our engineering team handles each week.

The Australian major-venue footprint

Australia carries a portfolio of major venues spread across the capital cities and the regional centres. The outdoor AFL and NRL stadium portfolio is the most visible. The Melbourne Cricket Ground (MCG) at Yarra Park is the largest, with 100,024 seats across the Great Southern Stand (BHP-funded), the Ponsford Stand, the Olympic Stand and the Members Reserve. It is owned by the Melbourne Cricket Club (MCC) and managed under a trust arrangement with the State Government of Victoria. The MCG hosts the AFL Grand Final, the Boxing Day Test, AFL home-and-away matches across the season and major concert tours when the schedule allows. Marvel Stadium at Docklands (53,359 seats, formerly Etihad Stadium and Telstra Dome before that) sits on the Victoria Harbour waterfront and operates a retractable roof — one of only a handful of fully-retractable-roof stadiums in the country and the venue that pioneered the architectural form in Australia. It is owned by the AFL and was redeveloped in the 2018-2024 cycle. AAMI Park (formerly Melbourne Rectangular Stadium) at the Melbourne Park precinct seats 30,050 across a tight rectangular bowl serving Melbourne Storm NRL, Melbourne Victory and Melbourne City A-League and the Melbourne Rebels Super Rugby team.

Sydney carries Allianz Stadium (the Football Stadium, rebuilt 2022 by Lendlease and John Holland to 42,500 seats) at Moore Park, Accor Stadium (formerly ANZ Stadium, formerly Stadium Australia from the 2000 Olympics) at Sydney Olympic Park Homebush with 83,500 seats configurable to 70,000 for AFL and rectangular for NRL, and the historic Sydney Cricket Ground adjacent to Allianz at Moore Park (48,000 seats, NSW Cricket Association). Brisbane carries Suncorp Stadium (Lang Park, 52,500 seats) home of the Brisbane Broncos, the Reds and the Roar, and the Gabba (currently under redevelopment as the Brisbane 2032 Olympic athletics venue) and at one point the Queen's Wharf precinct adjacent. Perth carries Optus Stadium at Burswood (60,000 seats, built by Multiplex 2018 as a greenfield project to replace the ageing Subiaco Oval) and the older Perth Stadium and HBF Park. Adelaide carries Adelaide Oval (the South Stand redeveloped by Hindmarsh-Bauer 2014 to 53,500 seats), the historic ground that hosts AFL, Test cricket and concerts under a heritage envelope. Hindmarsh Stadium (Coopers Stadium, 18,435 seats) serves the A-League. Canberra carries GIO Stadium Canberra (Bruce Stadium, 25,011 seats) for the Raiders and the Brumbies, Hobart carries Bellerive Oval and Newcastle the McDonald Jones Stadium (Hunter Stadium, 33,000 seats) and Townsville the Queensland Country Bank Stadium (Cowboys, 25,000 seats, opened 2020) replacing the old 1300SMILES Stadium. Geelong holds GMHBA Stadium (Kardinia Park, 36,000 seats) for the Cats.

Indoor arenas form the second tier of major venues. Rod Laver Arena at Melbourne Park (14,820 seats with retractable roof) is the centre court of the Australian Open and hosts the bulk of Melbourne's concert calendar through the rest of the year. John Cain Arena (formerly Hisense Arena, formerly Melbourne Park Multi-Purpose Venue, 10,500 seats with retractable roof) sits adjacent. Margaret Court Arena (7,500 seats with retractable roof, opened 2015) completes the Melbourne Park triumvirate, all three sharing the central plant and the BMS architecture of the Melbourne and Olympic Parks Trust. Qudos Bank Arena at Sydney Olympic Park (formerly Allphones Arena, Acer Arena, Sydney SuperDome, 21,000 seats) is Sydney's largest indoor arena. RAC Arena Perth (formerly Perth Arena, 15,500 seats) serves the western capital. Brisbane Entertainment Centre at Boondall (13,500 seats) serves the eastern capital. AIS Arena Canberra (5,200 seats at the Australian Institute of Sport) and the historic Hordern Pavilion at Moore Park complete the standard indoor circuit.

Convention and exhibition venues form the third tier. The International Convention Centre Sydney (ICC Sydney) at Darling Harbour combines a 35,000 square metre exhibition floor across Hall 1-7, the 5,000-delegate Aware Super Theatre and a banquet-and-conference suite that handles state and federal political conferences alongside the trade calendar. The venue was a Lendlease design-and-construct opened 2016 on the site of the old Sydney Exhibition Centre. The Melbourne Exhibition and Convention Centre (MCEC, locally known as Jeff's Shed after its 1990s patron Premier Jeff Kennett) at Southbank houses the Plenary Hall (5,500-seat auditorium, the largest of its kind in the southern hemisphere) and a 30,000 square metre exhibition floor across multiple halls. The 2018 South Wharf extension added 20,000 square metres of exhibition floor and a second plenary space. Brisbane Convention and Exhibition Centre at South Bank (operated by AEG Ogden, now ASM Global) carries the Plaza Auditorium (4,000 seats) and 20,000 square metres of exhibition floor. Adelaide Convention Centre on North Terrace adjacent to the Adelaide Festival Centre carries the Hall G plenary and exhibition floor. Perth Convention and Exhibition Centre on Mounts Bay Road, Cairns Convention Centre on the Esplanade and Wrest Point's Hobart Function Centre complete the national network. Most venues operate under integrated facility-management arrangements with ASM Global or AEG Ogden as the international operator partner.

The major-venue ductwork programme on a flagship project consumes 80,000 to 200,000 square metres of sheet metal across the 24-60 month construction window. The Optus Stadium Perth fabrication programme delivered an estimated 130,000 square metres on the Multiplex-led 2014-2018 build. The Allianz Stadium Sydney rebuild 2019-2022 by Lendlease and John Holland delivered an estimated 90,000 square metres. The ICC Sydney programme delivered an estimated 110,000 square metres. The Adelaide Oval South Stand programme of 2014 delivered an estimated 60,000 square metres on a working-stadium overlay constraint. The production capacity to deliver that volume reliably and at sealed-seam Class A construction across the construction window is the deliverability case for the SBKJ machinery configuration documented later in this guide.

NCC Class 9b mixed-occupancy classification at the major venue

The first step on any major-venue brief is NCC Volume 1 classification by zone. NCC Class 9b (assembly) covers the spectator bowl, the indoor arena floor, the convention auditorium, the exhibition hall, the function rooms, the ballroom, the resident-show theatre and the concert configuration of any multi-purpose space. Class 9b drives the higher AS 1668.2 outdoor-air rates, the more rigorous AS 1668.1 smoke-management strategy with mechanical smoke exhaust calculated from floor area, design fire size and ceiling height, dedicated stair pressurisation and lift-lobby pressurisation, and AS 1530.4 fire-resistance levels on every wall and slab penetration that intersects the spectator envelope.

Class 5 (office) covers the admin floors, the press and broadcast booths, the surveillance equipment room, the security guard-force station and the engineering office. Lower outdoor-air defaults than Class 9b. Class 6 (retail and restaurant) covers the merchandise outlets, the bars and the food-and-beverage outlets along the concourse — each carries the AS 1668.2 commercial kitchen exhaust scope per outlet and the dining and bar rates. Class 7a (car park) covers the basement parking and the porte-cochere, with AS 1668.2 mechanical car-park ventilation at 1 L/s/m2 baseline and CO monitoring. Class 9a (health) covers the medical room and the anti-doping suite where applicable.

A modern indoor arena adds Class 9c (residential care) if the venue carries a permanent overnight back-of-house dormitory, and Class 3 (hotel) where the venue is integrated with an adjacent hotel tower (the Optus Stadium precinct includes an integrated Crown Towers-adjacent footprint with extension service). The classification schedule drives every subsequent design decision. Build it first; review it at each design milestone; lock it before the AHU schedule is issued for tender.

AS 1668.2 outdoor air rates by major-venue zone

The ventilation schedule is the central design document for any major-venue brief. Every zone, NCC classification, design occupancy, AS 1668.2 outdoor-air rate, calculated supply volume, ACH, design pressure differential and BMS tag. The certifier reviews at building permit, the fire engineer cross-references against AS 1668.1, the commissioning engineer verifies during balancing, and the operations team uses it through the life of the building.

Spectator bowl seating. 7.5 L/s per person under AS 1668.2 Class 9b assembly default and ASHRAE 62.1 equivalent. At a 50,000-capacity bowl this corresponds to 375,000 L/s of fresh air across the two-hour load window. The CO2 setpoint is deliberately relaxed to 2,500-3,000 ppm at peak (versus 800-1,000 ppm in an office) because the dwell time is short, the activity is sedentary, the crowd warmth is welcome on a winter night, and CO2 dispersion to the open or roof-vented bowl is effectively unlimited. ACH targets are 6-10 at peak on a closed-roof venue and effectively uncapped on an open-roof venue.

Concourse circulation. 10 L/s per person plus the 0.3 L/s per square metre area component under AS 1668.2 Class 9b. Concourse spaces handle the 50,000-patron walk-through at halftime when restrooms and bars spike and the spectator population is briefly concentrated. NC 35-40 acoustic. Sealed-seam Class A construction. The 5-metre ceiling on most concourses allows for round spiral duct ring-mains served from the central plant.

Hospitality suite and corporate box. 10 L/s per person plus 0.3 L/s/m2 area component. MERV 13 filtration. NC 25-30 acoustic — the suite holder is paying for the experience and the air handling must be invisible. Dedicated suite AHU separate from the main bowl plant. Individual zone control. Humidity setpoint at 45-55% RH on premium-tier suites. Acoustic-attenuated supply outlets selected for low NC and low induction over seated guests. Sealed-seam Class A throughout with vibration-isolated hangers and minimal flexible duct.

Resident-show theatre and concert configuration. 10 L/s per person at AS 1668.2 Class 9b with peak-occupancy demand-controlled ventilation. NC 25-30 acoustic in the seating zone. Dedicated AHUs separate from the bowl. Stage-lighting heat budget integrated into the cooling load. Demand-controlled fresh air via CO2 sensors. AS 1668.1 smoke management with mechanical smoke exhaust at the proscenium or roof structure.

Locker room, training room and player shower. AS 1668.2 Class 9b athletic plus the steam-and-vapour management overlay. Shower-zone exhaust at 25-30 L/s per fixture continuous. Locker-zone supply at 10-15 ACH with MERV 13 filtration to suit elite athletic respiration patterns. Dedicated drying-line risers serving the washing-and-drying rooms downstream of the laundry. 316L stainless duct in the wet-zone return-air path to resist chlorinated-water and chloramine corrosion.

Press box and broadcast booth. 10 L/s per person under AS 1668.2 Class 5 office. NC 20-25 acoustic on the broadcast booth — the announcer's microphone picks up any background mechanical noise. Double-walled silencers on supply and return. Structural acoustic isolation of the AHU plinth. Dedicated AHU with stable temperature and humidity.

Function room and ballroom. 15-20 L/s per person at peak theatre-seating density (1.4 person/m2), 10-12 L/s per person banquet (0.7 person/m2), 7-10 L/s per person classroom (0.5 person/m2). A 1,000 square metre ballroom at theatre seating reaches 1,400 occupants. CO2-based demand-controlled ventilation saves 60-80% of ventilation energy on the average day. Typical ballroom AHU on a 1,000 square metre room is 35,000-55,000 L/s. Operable partition walls require parallel zoning.

Indoor arena floor (concert and event mode). 10 L/s per person at Class 9b assembly. When the arena reconfigures from sport to concert the bowl AHU re-sequences to a quieter, lower-velocity, NC 25 supply for the seated concert audience. Demand-controlled CO2 fresh air. Dedicated stage-area cooling for the performer envelope. LED lighting and video-wall sensible-heat budget can reach 200 kW in major concert configurations.

Indoor arena ice rink (where applicable). AS 1668.2 Class 9b assembly plus the dedicated ice-floor cooling and dehumidification overlay. Sub-floor brine coolers maintain the ice. Above-ice dehumidification at 4-7 degrees C dew point prevents fog formation. Air supply throw is configured to avoid disturbing the ice surface. RAC Arena Perth and Brisbane Entertainment Centre carry occasional ice configurations for AIHL ice hockey and ice-show events.

Convention hall and exhibition floor. Under-floor displacement ventilation at 0.25-0.5 metres per second at floor level. 16-18 degrees C supply temperature. One person per square metre peak during trade-show conditions. CO2-based demand-controlled fresh air. Dedicated AHU per hall on the BMS so individual halls can be conditioned independently for parallel events.

Plenary hall and conference auditorium. 10 L/s per person at AS 1668.2 Class 9b. NC 25-30 acoustic — the lecture audience is listening to a single speaker through the venue PA. Demand-controlled CO2 fresh air. Acoustic-lined supply duct on the last 6 metres into the auditorium envelope. Internal acoustic baffle on every supply diffuser.

Commercial cookline kitchen exhaust. Under AS 1668.2 Section 9 and NFPA 96 reference. Type I hood capture velocity 80-125 fpm. 16-gauge black-steel grease ducts welded liquid-tight. 1:50 slope to drain. Access doors every 3.5 metres. Fire-rated enclosure where the duct passes through occupied space. Dedicated make-up air at 70-90% of exhaust volume. Halftime spike handled by oversize fans at VFD setback for non-event mode.

Medical room, anti-doping suite, first-aid. AS 1668.2 Class 9a health overlay. MERV 13-14 filtration. Dedicated AHU separate from the bowl. Pressure differential to the corridor (positive for the medical room, negative for the anti-doping isolation suite).

Car park, basement parking, porte-cochere. AS 1668.2 Section 4 mechanical car-park ventilation at 1 L/s per square metre baseline with CO monitoring. Elevated rate at EV-charging zones for thermal management. Smoke-management overlay to AS 1668.1 where the car park is below an occupied venue.

Service yard and loading dock. AS 1668.2 Class 7b warehouse overlay. Truck-engine exhaust ventilation per AS 1668.2 Table B1. Diesel-particulate management on enclosed service-yard envelopes.

MCG HVAC duct fabrication scope

The Melbourne Cricket Ground is the largest of the Australian stadiums and the most complex from a heritage-overlay perspective. The Great Southern Stand redevelopment (BHP-funded in the late 2010s) added a hospitality tier and an extended back-of-house to the 1992 Great Southern Stand built for the Lillee-Marsh era. The Northern Stand redevelopment of 2006 by Multiplex replaced the old Olympic and Northern Stands with a single integrated structure carrying corporate boxes, the AFL Members Reserve, broadcast facilities and the Long Room. The Ponsford Stand and the Members Reserve trace back to the 1928 grandstand and the 1956 Melbourne Olympics. The ground is owned by the Melbourne Cricket Club (MCC) and managed under the Melbourne Cricket Ground Trust on behalf of the State of Victoria.

The HVAC scope on a heritage MCG redevelopment is shaped by the existing structural grid, the existing chilled-water plant capacity (the central chillers are progressively upgraded in stages with the redevelopment rounds), the existing risers and the existing main-switch room locations. The Northern Stand redevelopment integrated a new central chilled-water plant on the south-eastern footprint and pushed risers into the structural columns of the new stand. The Great Southern Stand BHP package added corporate-suite zones served by dedicated suite AHUs cantilevered off the existing structural slab. The Members Reserve fit-out within the legacy stands runs on smaller, distributed AHUs in plant rooms inserted into the legacy ceiling void.

Duct construction for an MCG redevelopment runs sealed-seam Class A galvanised G300 for the bowl supply, the concourse and the suite back-of-house. The bowl-supply ducts are routed through the precast structural soffit on a clear duct-routing easement coordinated with the architect, the engineer and the broadcast cabling. The bowl-supply diffusers are typically slot-and-grille types throwing conditioned air down into the seating tier from the fascia edge of the stand soffit. The concourse runs round spiral duct ring-mains in 800-1500 mm diameters, with the SBFB-1500 spiral former producing the run on a continuous coil schedule. The smoke spill duct programme follows AS 1668.1 with 1.6-2.0 mm galvanised construction welded continuously on the smoke-shaft spine and dedicated bowl smoke-exhaust spurs.

The MCG's Boxing Day Test event (4-5 day cricket test with daily crowds of 80,000-100,000) and the AFL Grand Final (capacity 100,024) drive the peak HVAC sizing. The 90-minute AFL Grand Final crowd load is the textbook major-venue design case. The peak sensible load on the bowl is dominated by occupant heat (50,000-100,000 patrons at 100 W each), supplemented by the lighting and broadcast lighting load on the structural soffit. The peak latent load is dominated by occupant moisture (50-100 g per hour per patron, multiplied by capacity) and the residual humidity from the catering precinct. The central plant chilled-water capacity sizes around the AFL Grand Final at peak design dry bulb 32 degrees C with the wet-bulb conditions of a typical Melbourne September afternoon.

Marvel Stadium retractable roof ventilation

Marvel Stadium at Docklands (formerly Etihad Stadium and Telstra Dome before that) was Australia's first retractable-roof major stadium when it opened in 2000 as the Victoria Harbour stadium project. The 53,359-seat bowl is configurable from full-football rectangular to AFL oval through the moveable lower-tier seating system. The retractable roof is mechanically actuated and the BMS is interlocked to the roof-position sensor. The 2018-2024 redevelopment cycle by the AFL (the venue is AFL-owned and AFL-managed) refurbished the spectator concourses, the corporate suites, the broadcast facilities and the central plant.

The roof-position interlock is the defining HVAC characteristic of Marvel Stadium. Roof-open mode operates the bowl on natural ventilation and perimeter dehumidification only. Bowl AHUs are off or in setback mode. Suites, concourses, kitchens and back-of-house run on full mechanical service. The bowl smoke-management strategy in roof-open mode is gravity exhaust through the open roof — no mechanical smoke exhaust is required because the roof is the exhaust path. Roof-closed mode activates full bowl AHU output, typically 40-60 ACH for the spectator volume, with the smoke-management ducts ready to AS 1668.1 stand-by. The BMS reads the roof position and switches the supply, return, smoke-management and outdoor-air strategies as a single block. The interlock is safety-critical and must fail to roof-closed HVAC operation if the position sensor reads ambiguously.

The retractable roof structure at Marvel Stadium is a moving truss system that runs on roof-edge rails. The roof mass and the wind loading determine the rate of closure — typically 20-30 minutes from open to closed under normal conditions, longer in high wind. The HVAC sequence allows the bowl to ramp from no-mechanical-cooling to full-mechanical-cooling across that 20-30 minute window without overcooling on the leading edge or undercooling on the trailing edge. The supply temperature reset is BMS-driven from the bowl temperature and humidity sensors.

Smoke management at Marvel Stadium in roof-closed mode follows AS 1668.1 with mechanical smoke exhaust at the bowl ceiling capacity sized for the closed-roof spectator volume. The smoke-spill duct programme is rated 250 degrees C for 120 minutes through the fire-rated penetration zone and 600 degrees C for 60 minutes through the structural enclosure. Smoke exhaust fans are roof-mounted on the perimeter of the bowl envelope and discharge to safe-distance outdoor air per AS 1668.1 Section 7. The make-up air strategy uses opening doors and grille louvres at the concourse level to draw replacement air without depressurising the bowl. The retractable-roof venue is mechanically the same architecturally as a fully-enclosed venue when the roof is closed — the difference is the BMS sequence that handles the transition.

Marvel Stadium's HVAC duct programme uses galvanised G300 sealed-seam Class A for the general bowl and back-of-house supply, 304 stainless in the kitchen exhaust and make-up air paths, and 1.6-2.0 mm welded smoke-spill duct on the bowl ceiling and the smoke shafts. The hospitality suite tier above the lower bowl runs on dedicated suite AHUs with NC 25 acoustic, vibration-isolated hangers and the SBAL-V production output finished with the suite acoustic overlay. The Marvel Stadium central plant integrates with the adjacent Etihad Stadium retail and the AAMI Park precinct as part of the Docklands waterfront mechanical grid.

Optus Stadium Perth — greenfield new build 2018

Optus Stadium at Burswood opened in 2018 as a greenfield Multiplex-led design-and-construct project on the Burswood Peninsula across the Swan River from the Perth CBD. The 60,000-seat bowl replaced the ageing Subiaco Oval and Patersons Stadium as Western Australia's primary AFL and cricket venue. The bowl carries AFL home-and-away through the West Coast Eagles and Fremantle Dockers, hosts cricket tests at the WACA, and runs concert tours through the Western Australian summer season. The stadium sits within a master-planned precinct that includes the Crown Perth integrated resort and the East Perth riverside corridor.

As a greenfield project the Optus Stadium HVAC architecture was set from concept. Central chilled-water plant sized for the full 60,000-seat bowl plus 70 corporate suites plus full concourse circulation plus the four signature restaurants plus the back-of-house. Smoke-management strategy embedded in the architectural form with smoke shafts integral to the structural columns. Sealed-seam Class A construction throughout. Common chilled-water and condenser-water backbones. Single BMS architecture from the start.

The Optus Stadium bowl-supply strategy uses fascia-edge slot-diffuser supply throwing conditioned air down into the seating tier from the under-soffit fascia plenum. The fascia plenum is a continuous box section that runs the full perimeter of the bowl, fed from riser shafts at every fifth structural column. The plenum is sealed-seam Class A galvanised on the SBAL-V production schedule, with internal acoustic lining on the last 2 metres into the diffuser face to drop the NC. The diffuser pattern delivers conditioned air at 20 degrees C through the seating tier on a downward 15-degree throw at 4-6 metres per second at the diffuser face, reaching the spectator at 0.25-0.4 metres per second after entrainment.

The Optus Stadium corporate suite tier runs 70 individual suites on the eastern and western sides of the bowl. Each suite is on a dedicated VAV with humidity control, MERV 13 filtration and NC 25 acoustic. The supply duct from the central plant routes through the structural soffit to the suite penetration, with internal acoustic lining on the last 6 metres before the suite. The return-air path runs through ceiling grilles back to a common return shaft per suite tier. The hospitality suite mechanical is the highest-spec part of the Optus Stadium build and the part that most directly determines the suite-holder experience.

The Optus Stadium kitchen exhaust programme covers 15 food-and-beverage outlets across the concourse plus the four signature restaurants and the eight bars. Each cookline runs Type I hood capture at 100 fpm with 16-gauge black-steel welded grease duct sloped 1:50 to a collection point. The grease-duct seams are produced on the SBLR-600 welder. Make-up air at 80% of exhaust on the SB-ZF1500 stitchwelder line in 304 stainless. The discharge schedule places the grease-duct discharge fans on the roof at safe distance from the bowl-supply outdoor-air intakes per AS 1668.2 Section 8. The halftime exhaust spike is handled by VFD-driven oversize fans.

The Optus Stadium NABERS Energy compliance target was a 5-star equivalent stadium rating, achieved through demand-controlled ventilation on the bowl outdoor-air rate during low-event mode, variable-speed drives on every chilled-water pump and AHU fan, heat recovery on the kitchen exhaust make-up air paths where the geometry allows, and the central BMS sequence-of-operation that re-sequences the plant for event-day versus non-event-day load. The non-event-day load on a 60,000-seat stadium is dominated by the corporate office and the back-of-house, with the bowl in setback or shut-down. The peak-day load is dominated by the bowl. NABERS compliance bridges the two.

ICC Sydney convention HVAC at trade-show scale

The International Convention Centre Sydney (ICC Sydney) at Darling Harbour was a Lendlease design-and-construct delivered 2016 on the site of the former Sydney Exhibition Centre. The venue combines a 35,000 square metre exhibition floor across Hall 1-7, the 5,000-delegate Aware Super Theatre, and a banquet-and-conference suite that handles state and federal political conferences, the annual Australian Open Tennis function programme and the bulk of Sydney's major trade calendar. The venue is operated by ASM Global under a 25-year management agreement with the NSW Government and Lendlease as the design-build-finance-maintain partner.

The exhibition hall HVAC at ICC Sydney runs on under-floor displacement supply through floor diffusers across the entire 35,000 square metre slab. The displacement strategy means cool air at 16-18 degrees C is delivered at 0.25-0.5 metres per second at floor level, rising through stand exhibitors and visitors at peak occupancy of one person per square metre during trade-show conditions. The displacement supply is sized for 1 person per square metre at 10 L/s per person plus 0.3 L/s per square metre area component — for a 35,000 square metre floor this is 350,000 L/s plus 10,500 L/s on the area component, totalling 360,500 L/s of design fresh air at peak. The floor-diffuser distribution avoids the high-throw overhead supply that would otherwise overcool the exhibitor stands and undercool the visitor circulation.

The conference theatre HVAC at ICC Sydney runs on conventional overhead supply with NC 25 acoustic and demand-controlled CO2-based fresh air. The 5,000-delegate auditorium represents a Class 9b assembly load with the acoustic-sensitive overlay typical of a lecture-and-presentation venue. Internal acoustic lining on the last 6 metres of supply into the seating zone. Dedicated VAV terminal per zone. CO2 sensor in the return-air path triggers the demand-controlled fresh-air response. Speaker-zone supply is sized separately so that the presenter at the podium is on a constant low-velocity supply that does not disturb microphone audio.

The banquet-and-conference suite at ICC Sydney carries the gala-dinner, the awards-night, the conference-keynote and the trade-show-gala configurations. The ballroom is 1,200 square metres and seats 1,600 in theatre mode, 1,000 banquet and 600 cabaret. Operable partition walls divide the space into smaller function rooms when required. Each sub-zone is on a dedicated VAV with CO2 sensor and thermostat. NC 25-30 acoustic. The kitchen behind the ballroom is a commercial cookline serving 2,000 covers per service at peak gala-dinner load with the kitchen exhaust on the standard AS 1668.2 Section 9 design.

The ICC Sydney duct construction throughout is sealed-seam Class A to AS 4254.1. Galvanised G300 for general supply and return on the SBAL-V production schedule. 304 stainless on the kitchen exhaust and make-up air paths on the SB-ZF1500 stitchwelder. Spiral round duct on the SBFB-1500 for the concourse ring distribution. The smoke management is to AS 1668.1 with mechanical smoke exhaust at the exhibition hall ceiling and the theatre proscenium, with the smoke-spill duct programme rated 250 degrees C for 120 minutes through the fire-rated penetration zone.

The ICC Sydney BMS coordinates with the venue-mode schedule — exhibition mode, conference mode, gala-dinner mode, concert mode, sports event mode (the venue carries occasional basketball and netball when configured). Each mode sets a different AHU sequence, a different fresh-air rate and a different acoustic target. The BMS sequence-of-operation document is 200+ pages and is the operational reference for the facilities team across the venue's 25-year operational life.

MCEC Jeff's Shed and the 2018 South Wharf extension

The Melbourne Exhibition and Convention Centre (MCEC) at Southbank — locally known as Jeff's Shed after its 1990s patron, then-Premier Jeff Kennett who commissioned the original Melbourne Exhibition Centre in 1996 — combines the original Exhibition Centre with the Melbourne Convention Centre opened 2009 on the adjacent South Wharf site. The Plenary Hall at the Convention Centre side seats 5,500 in lecture mode and is the largest auditorium of its kind in the southern hemisphere. The Exhibition Centre side carries 30,000 square metres of exhibition floor across multiple halls divisible by movable partition. The 2018 South Wharf extension added 20,000 square metres of exhibition floor and the second plenary space (Plenary 2, 1,000 seats) along with new connecting concourse and additional catering precincts.

The MCEC Plenary Hall is the showpiece of the venue and the most acoustically demanding space. The 5,500-seat configuration sits a single audience facing a stage. Sound reinforcement is provided through the venue PA, with the audience listening to a lecturer, a keynote speaker, a conference presentation or a concert. The Plenary Hall HVAC runs on dedicated AHUs with NC 25 acoustic in the seating zone. The supply duct from the central plant routes through the structural soffit to the over-stage and side-wall plenum, with internal acoustic lining on the last 6 metres of supply. Dedicated VAV terminals on each seating sub-zone. Demand-controlled CO2 fresh air. The speaker-zone supply at the podium is sized separately so the presenter is on a constant low-velocity supply.

The exhibition hall side at MCEC runs displacement supply through floor diffusers across the exhibition slab. The exhibition slab is divided into halls 1-5 in the original Jeff's Shed and 6-10 in the 2018 South Wharf extension, with each hall on a dedicated AHU so the halls can be configured independently for parallel events. The displacement supply at 16-18 degrees C at 0.25-0.5 metres per second at floor level rises through stand exhibitors and visitors at one person per square metre peak.

The MCEC kitchen exhaust programme is among the largest commercial-cookline programmes in any Australian convention venue. The venue serves up to 8,000 covers per service at major gala events, with the catering precinct running 15 separate cooklines across the concourse and the back-of-house. Each cookline gets a Type I hood, 16-gauge welded grease duct sloped 1:50 to a collection point, dedicated make-up air at 80% of exhaust and a fire-rated enclosure where the duct passes through occupied space. The discharge schedule places the grease-duct fans on the roof at safe distance from the bowl-supply outdoor-air intakes and the adjacent residential intake of the South Wharf precinct.

Duct construction at MCEC is sealed-seam Class A to AS 4254.1 throughout. Galvanised G300 for general supply and return, 304 stainless in the kitchen exhaust make-up air paths, internal acoustic lining on the Plenary Hall supply, dedicated smoke spill ducts to AS 1668.1 with 250 degrees C for 120 minute rating, BMS coordinated with the venue-mode schedule (lecture, banquet, exhibition, concert, gala dinner). The venue mode changes the AHU setpoint, the fresh-air rate, the supply temperature, the lighting interlock and the acoustic configuration. The BMS sequence-of-operation document is the operational reference for the MCEC facilities team across the venue's lifecycle. The MCEC has held NABERS Energy 5-star ratings under the convention-centre rating tool.

Indoor arena HVAC — Rod Laver, John Cain, Margaret Court Arena, Qudos Bank Arena

Australian indoor arenas operate as multi-purpose venues that switch between Grand Slam tennis, NBL basketball, A-League netball, AIHL ice hockey, concert tours, comedy shows, motivational-speaker events, e-sports tournaments and the occasional corporate gala dinner. Rod Laver Arena at Melbourne Park is the largest and most acoustically demanding of the four. The 14,820-seat retractable-roof bowl is the centre court of the Australian Open and the venue for the bulk of Melbourne's concert calendar through the rest of the year. John Cain Arena (10,500 seats, retractable roof) and Margaret Court Arena (7,500 seats, retractable roof) complete the Melbourne Park triumvirate, sharing the central plant and BMS with Rod Laver under the Melbourne and Olympic Parks Trust facility-management arrangement.

The retractable roof at Rod Laver Arena is the design parameter that distinguishes the arena from a fixed-roof venue. Roof-open mode (typical for daytime sessions at the Australian Open with mild weather and good visibility) runs the bowl on natural ventilation and perimeter dehumidification only. Roof-closed mode (typical for night sessions, rain delays, extreme heat policy days, concert tours, comedy and corporate events) activates full bowl AHU output. The transition between modes is BMS-controlled with the roof-position sensor as the master input. The Australian Open uses extreme-heat-policy thresholds based on wet-bulb-globe-temperature that may trigger roof closure during play, which means the HVAC has to ramp from setback to full output during a match without disturbing the bowl thermally.

The acoustic configuration of Rod Laver Arena changes between sport mode and concert mode. Sport mode (Australian Open tennis, NBL basketball, A-League netball) tolerates NC 35-40 background from HVAC. Concert mode (Taylor Swift, Adele, Ed Sheeran, the major touring acts) requires NC 25 in seating because the audience is listening to amplified music through the venue PA. The bowl AHU re-sequences for concert mode with a lower supply velocity, internal-lined supply duct, and the suite AHUs in coordinated configuration. The acoustic transition is part of the venue's value proposition — Rod Laver hosts both the Australian Open and major concerts on the same week within hours of each other.

Margaret Court Arena is the smallest of the three Melbourne Park arenas and the most flexible. The 7,500-seat configuration supports tennis, basketball, ice hockey (the AIHL Melbourne Mustangs use the venue occasionally), corporate gala dinner, indoor athletics and the occasional ice-show event. The ice configuration requires sub-floor brine coolers, above-ice dehumidification at 4-7 degrees C dew point to prevent fog formation, and supply throw configured to avoid disturbing the ice surface. The transition from ice to hardcourt tennis takes 48-72 hours including the ice removal, the floor preparation, the hardcourt installation and the HVAC reconfiguration from above-ice dehumidification to tennis-mode supply.

Qudos Bank Arena at Sydney Olympic Park (formerly Allphones Arena, Acer Arena, Sydney SuperDome) is Sydney's largest indoor arena at 21,000 seats. The venue is fully enclosed (no retractable roof) and serves NBL Sydney Kings basketball, NRL pre-season matches, concert tours, ice-show events, e-sports tournaments and corporate galas. The HVAC architecture is conventional enclosed-arena with full mechanical service at all times. The bowl AHU operates continuously during event mode with demand-controlled CO2 fresh air and the suite AHUs in coordinated configuration. The arena hosts up to 200 events per year with the highest occupancy spike during concert season (October-April).

RAC Arena Perth (formerly Perth Arena, opened 2012) is the western capital's primary indoor arena at 15,500 seats. The architecturally distinctive faceted-roof venue serves the Perth Wildcats NBL, concert tours, corporate events and the occasional NBA exhibition match. The HVAC architecture is fully enclosed with mechanical service at all times. Brisbane Entertainment Centre at Boondall (13,500 seats, opened 1986) is the older of the major Brisbane arenas and serves concerts, NBA pre-season and corporate events.

Indoor arena duct fabrication runs on the same SBKJ machinery configuration as a stadium bowl but with the acoustic and the concert-mode overlay weighted more heavily. The SBAL-V auto duct line produces the bulk galvanised rectangular ductwork for the bowl supply, the concourse and the back-of-house. The SBFB-1500 spiral former runs the concourse ring-main round duct. The SBSF-1525 stitchwelder produces high-volume round supply for the dome-shaped bowl envelope where the geometry suits welded round duct. The SB-ZF1500 stitchwelder produces 304 stainless kitchen exhaust make-up air and the NC 25 acoustic supply duct for the concert-mode configuration. The SBPC1500 plasma cutter handles stainless fittings and access doors.

Allianz Stadium Sydney — full demolition and rebuild 2019-2022

Allianz Stadium at Moore Park Sydney (the Football Stadium, the Sydney Football Stadium) was demolished and rebuilt 2019-2022 on the original site by a joint venture of Lendlease and John Holland. The new 42,500-seat rectangular stadium replaced the 1988 Sydney Football Stadium and serves the NSW Waratahs, the Sydney Roosters, Sydney FC, the Wallabies for select tests and major concert tours. The rebuild was designed by Cox Architecture and Buchan Group with the structural and mechanical-services brief delivered through the design-build joint venture.

The Allianz Stadium HVAC architecture sets a contemporary benchmark for a mid-size Australian rectangular stadium. Central chilled-water plant on the southern footprint, dedicated bowl AHUs feeding fascia-edge slot diffusers, hospitality suite tier on dedicated VAV with NC 25 acoustic, concourse circulation on round spiral duct ring-mains, kitchen exhaust on the standard AS 1668.2 Section 9 cookline programme. Sealed-seam Class A throughout to AS 4254.1. Smoke management to AS 1668.1 with 250 C/120 min rated smoke-spill ducts on the bowl ceiling spine. NABERS Energy compliance against the 5-star equivalent stadium target.

The hospitality programme at Allianz Stadium runs 39 corporate suites and 8 super suites across two tiers above the lower bowl. Each suite is on a dedicated VAV with humidity control, MERV 13 filtration and NC 25 acoustic. The supply duct routes through the structural soffit to the suite penetration with internal acoustic lining on the last 6 metres. The return-air path runs through ceiling grilles back to a common return shaft per suite tier. The premier-tier super suites carry a higher acoustic specification (NC 20) and individual humidity setpoint at 45-55% RH.

The Allianz Stadium concourse programme runs 25 food-and-beverage outlets plus 4 signature bars across the upper and lower concourses. Each cookline runs Type I hood capture at 100 fpm with 16-gauge welded grease duct. Make-up air at 80% of exhaust. The discharge schedule places the grease-duct fans at safe distance from the bowl-supply outdoor-air intakes and the adjacent Sydney Cricket Ground bowl. The two venues share the Moore Park precinct and coordinate discharge schedules across the venue boundary.

The Allianz Stadium duct fabrication programme delivered an estimated 90,000 square metres across the 2019-2022 construction window. The fabrication contractor configured the SBAL-V auto duct line as the workhorse for the bulk galvanised programme, with the SBFB-1500 spiral former on the concourse ring-main round duct, the SB-ZF1500 stitchwelder on the kitchen exhaust and the suite acoustic supply, and the SBLR-600 welder on the grease-duct seams. The fabrication ran on a shop-drawing approval cycle of 4-6 weeks per area with the SBKJ engineering team supporting the contractor's design-verification queries on the bowl smoke-spill duct interpretation against AS 1668.1.

Adelaide Oval South Stand 2014 — heritage overlay

The Adelaide Oval South Stand redevelopment of 2014 (Hindmarsh Construction with Bauer JV) added 14,000 seats to the western side of the historic Adelaide Oval as part of the broader 2008-2014 Adelaide Oval Redevelopment project. The historic ground hosts AFL home-and-away for the Adelaide Crows and Port Adelaide Power, Sheffield Shield and Test cricket for South Australia, the Adelaide International Tennis events and concert tours during the Adelaide Festival programme. The ground is owned by the South Australian Cricket Association (SACA) and the South Australian National Football League (SANFL) under a joint venture and is managed by the Adelaide Oval Stadium Management Authority.

The Adelaide Oval redevelopment was a heritage overlay project — the existing 1882 grandstand on the southern side was retained and integrated into the new South Stand structure. The HVAC architecture had to coordinate with the heritage envelope, the existing structural grid and the existing central plant. The new bowl-supply ducts route through the precast structural soffit on a clear routing easement coordinated with the heritage architect. The hospitality suite tier above the lower bowl runs on dedicated suite AHUs cantilevered off the new structural slab. The Members Reserve fit-out within the legacy stand runs on smaller distributed AHUs in plant rooms inserted into the legacy ceiling void.

Duct construction at Adelaide Oval South Stand runs sealed-seam Class A to AS 4254.1 throughout. The SBAL-V production schedule handled the bulk galvanised rectangular ductwork for the bowl supply, the concourse and the back-of-house. The smoke-spill duct programme on the new South Stand follows AS 1668.1 with 1.6-2.0 mm welded construction on the smoke shaft spine and dedicated bowl smoke-exhaust spurs. The kitchen exhaust programme covers 12 food-and-beverage outlets plus the signature restaurant and 6 bars on the new concourse.

Smoke spill duct in stadium and arena — AS 1668.1 and AS 4254

Smoke management is the single most safety-critical HVAC scope on a major-venue project. AS 1668.1 governs the smoke-management strategy across the NCC Class 9b assembly envelope. The strategy combines mechanical smoke exhaust at the bowl, the indoor arena, the convention auditorium and the exhibition hall ceiling, dedicated stair pressurisation for every egress stair, lift-lobby pressurisation, smoke-management dampers on every AHU return, fire-rated smoke spill ducts to AS 1668.1 construction class, BMS-orchestrated sequence-of-operation per zone of origin and fail-safe duct construction that withstands the fire-load temperature for the required duration.

AS 4254 Section 7 sets the construction class for smoke spill duct. The construction class is 250 degrees C for 120 minutes (2-hour 250 C rating) in the bowl smoke-spill spine and 600 degrees C for 60 minutes in the smoke-shaft sleeve through fire-rated walls and slabs to AS 1530.4. Wall thickness is typically 1.6-2.5 mm galvanised G300 or 304 stainless welded continuously, with no transverse joints in the fire-rated penetration zone. Hangers are fire-rated to match the duct, gaskets are intumescent under AS 1682, and the entire register is documented for AS 1851 in-service inspection on a six-monthly cycle.

The smoke-spill duct fabrication runs on the SBAL-III sheet-feed line for the heavy-gauge 1.6-2.5 mm coil schedule, with manual welding stations served by the SBLR-600 producing the longitudinal seam to the AS 4254 Section 7 specification. The SBSF-1525 stitchwelder produces the round smoke-shaft sleeve sections where the geometry suits a welded round profile. The SBPC1500 plasma cutter handles access doors, cleanout panels and test ports on the smoke-spill spine. The completed smoke-spill duct is pressure-tested to the project leakage class before insulation and documented for AS 1851 testing.

The smoke-management BMS sequence is the part of the design that ties the duct construction to the operational life of the building. The sequence reads the zone-of-origin from the fire-detection system (AS 1670 for the detection wiring), activates the appropriate smoke-spill fans, opens the smoke-exhaust dampers in the zone of origin and closes the smoke-resistant dampers at the zone boundary. Stair pressurisation fans run continuously to maintain positive pressure in the egress stairs. Lift-lobby pressurisation runs on alarm. Make-up air comes from opening concourse doors and grille louvres. The sequence must be tested at commissioning, re-tested annually under AS 1851 and re-validated whenever the configuration changes.

Stadium and arena smoke-spill duct programmes are large in absolute terms. A 50,000-seat stadium runs 200-400 metres of bowl smoke-spill spine and 600-1200 metres of smoke-shaft sleeve through the structural envelope. The MCG carries an estimated 1,500 metres of smoke-spill duct across the four stands. Marvel Stadium carries an estimated 900 metres including the retractable-roof closure ductwork. ICC Sydney carries an estimated 600 metres across the exhibition halls, the theatre and the conference suite. MCEC carries an estimated 800 metres. The fabrication time on the smoke-spill programme is typically 6-9 months of dedicated SBAL-III line time depending on the venue scale.

Hospitality suite and corporate box mechanical

The hospitality suite and corporate box programme is the revenue-driving differentiator on a major-venue project. The Optus Stadium 70-suite tier, the Allianz Stadium 47-suite tier (39 corporate plus 8 super), the Marvel Stadium two-tier corporate suite programme and the MCG Northern Stand corporate-box programme each carry the highest mechanical specification on the venue. The suite holders pay six- and seven-figure annual fees for a 12-20 person box with food-and-beverage service, broadcast view of the bowl and a controlled-temperature, controlled-humidity, controlled-acoustic environment.

The suite mechanical brief is NC 25-30 acoustic, MERV 13 filtration, individual zone control, humidity setpoint at 45-55% RH on premium-tier suites, vibration-isolated hangers, minimal flexible duct and acoustic-attenuated supply outlets selected for low NC and low induction over seated guests. The supply duct routes through the structural soffit to the suite penetration with internal acoustic lining on the last 6 metres before the suite. The duct construction is sealed-seam Class A throughout and the SBAL-V production schedule produces the same gauge galvanised material as the back-of-house with the acoustic overlay added at the suite penetration.

Each suite is on a dedicated VAV with CO2 sensor, thermostat and humidity sensor. The VAV terminal mixes outdoor air at 10 L/s per person plus 0.3 L/s per square metre area with return air from the suite, modulates the supply temperature against the suite setpoint and re-heats with a hot-water coil if required. The fan-coil arrangement varies — some venues use a chilled-water coil on the VAV terminal (Optus Stadium configuration), others use a dedicated fan-coil unit at the suite (the Marvel Stadium configuration in the older areas) and a third arrangement uses a DOAS with a separate fan-coil for sensible cooling (the contemporary best-practice configuration adopted in the Allianz Stadium 2022 rebuild).

The suite acoustic specification is critical. The suite holder is in a glass-fronted box looking down on the bowl, with the bowl PA audible at typical event level, the crowd soundscape at typical match level and the hospitality service running through the box. The HVAC must be invisible underneath all of that. NC 25 in a stadium suite is achieved through low-velocity supply (under 2.5 metres per second at the diffuser face), in-line duct-mounted attenuators on supply and return at the suite penetration, internal acoustic lining on the supply duct, vibration-isolated AHU plinth, structural acoustic isolation of the suite envelope from the bowl envelope and double-walled silencer construction on the return side.

The premier-tier super suites at flagship venues carry a higher specification still — NC 20, dedicated four-pipe fan coil with independent heating and cooling, humidity control at 50% RH year-round, dedicated AHU separate from the standard suite plant, sealed-seam Class A throughout, marble-and-walnut interior finish that drives the architectural ceiling depth, and the SBAL-V production output finished with the bespoke acoustic and finish overlay specified by the venue's interior architect.

Locker room, training room, player facility

Stadium and arena locker rooms, training rooms and player shower facilities are the most environmentally hostile zones on a major-venue project. The locker-room envelope handles elite athletic respiration (high CO2 production at sustained high-intensity exercise), the shower zone handles high-volume steam and chlorinated-water vapour, the laundry handles high-temperature drying and the medical-treatment zone handles wound-care aerosols.

Shower-zone exhaust runs at 25-30 L/s per fixture continuous to clear the steam and prevent moisture accumulation on adjacent surfaces. The exhaust duct is 316L stainless or PVC-coated steel in the wet-zone return-air path to resist chloramine corrosion from the chlorinated-water aerosol. The exhaust discharges through dedicated risers to the roof at safe distance from outdoor-air intakes. The shower-zone supply runs at 10 ACH with MERV 13 filtration and dedicated AHU.

Locker-zone supply runs at 10-15 ACH with MERV 13 filtration to suit elite athletic respiration patterns and the high turnover of athletes through the warm-up, the match and the post-match cooldown. The locker bench supply diffusers are positioned to deliver conditioned air at the athlete bench without overcooling the resting player. The return-air path through the locker-room ceiling avoids the shower-zone steam re-entrainment.

The drying-line risers serving the washing-and-drying rooms downstream of the laundry handle high-temperature exhaust at 50-80 degrees C from the commercial dryers. The duct is 304 stainless on the SB-ZF1500 stitchwelder line, sized for the dryer manufacturer's exhaust specification (typically 200-400 L/s per dryer at the duty point). The discharge is to the roof at safe distance from outdoor-air intakes.

The medical-treatment zone runs at AS 1668.2 Class 9a health overlay with MERV 13-14 filtration, dedicated AHU separate from the locker-room and back-of-house plant, and pressure differential to the corridor (positive for the medical room to prevent ingress of locker-room contamination). The anti-doping suite where applicable is at negative pressure to the corridor to contain potential contaminants in the isolation envelope. The AS/NZS 3666 microbial-control overlay applies to all air-water interfaces — Legionella risk from shower aerosols travels into the return-air path if the air-handler return is poorly located, and the operator carries continuous monitoring duty.

Convention floor and exhibition hall reconfiguration

Convention and exhibition venues earn revenue across multiple event configurations on the same calendar week. ICC Sydney handles a trade show in Hall 4 on Monday, a corporate gala dinner in Hall 5 on Tuesday, a state-political conference in Hall 6 on Wednesday and a graduation ceremony in Hall 7 on Thursday — with the operable partition walls reconfigured between each event. MCEC handles up to 8 simultaneous events across its hall portfolio at peak. Brisbane Convention Centre handles 4-5 simultaneous events. Each event mode carries a different occupancy load, a different acoustic target, a different fresh-air rate and a different lighting interlock.

The HVAC architecture has to support the reconfiguration without manual reprogramming between events. The standard solution is parallel-zoned VAV terminals with the BMS reading the partition-wall position sensors. When the partition closes the BMS recognises the sub-zone boundary and applies the appropriate AHU setpoint, fresh-air rate and acoustic configuration to the sub-zone independently. When the partition opens the sub-zones merge under a common control. The CO2 sensor in each sub-zone return-air path triggers the demand-controlled fresh-air response per occupancy.

The exhibition hall under-floor displacement supply distribution serves the reconfiguration well because the floor diffusers are uniformly distributed across the slab and the partition-wall reconfiguration does not disturb the supply path. The exhibition slab is divided into halls on the BMS schedule and each hall can be conditioned independently for parallel events. The overhead supply distribution typical of conference auditoriums and ballroom configurations needs to be parallel-zoned per partition sub-zone, which drives a higher AHU count and a more complex duct routing through the structural soffit.

The kitchen exhaust programme for the convention venue handles the gala-dinner spike across an unpredictable schedule. A typical 1,000-cover gala dinner runs 50-80 kW of cookline heat for the 2-3 hour service window with a dedicated commercial kitchen behind the ballroom or in the back-of-house. The kitchen exhaust is sized for peak with the make-up air at 70-90% of exhaust and the discharge schedule coordinated with the venue's outdoor-air intakes. The fans run on VFD setback during the non-event days and ramp to full output for the gala-dinner service.

Concert mode and acoustic switching

Indoor arenas and convention auditoriums earn the highest revenue per square metre on the concert and major-event configuration. Rod Laver Arena hosts up to 100 concert dates per year, Qudos Bank Arena up to 200 dates per year, MCEC Plenary Hall up to 50 major-event dates per year. The concert configuration changes the acoustic, the lighting and the HVAC at the same time — the venue switches from sport-mode NC 35-40 to concert-mode NC 25 in the bowl, the LED-wall lighting load lifts to 200 kW from the rigging, and the stage-area cooling for the performer envelope kicks in to handle the 80-100 kW of stage-rig heat.

The HVAC sequence for concert mode runs three coordinated transitions. First, the bowl AHU re-sequences to a lower supply velocity with internal-lined supply duct to drop the bowl acoustic from NC 35-40 to NC 25. The supply temperature is set to the concert-audience target (typically 22-23 degrees C cool with the venue at full occupancy) with a humidity setpoint that allows for the audience moisture load. Second, the LED-wall lighting and the rigging load are integrated into the cooling budget — the lighting designer publishes the rigging-load schedule and the BMS reads it as a planned-event load. Third, the stage-area cooling runs on dedicated supply for the performer envelope at the artist's required setpoint (typically cooler than the audience setpoint, often 18-20 degrees C at the stage face).

The LED-wall and rigging lighting load is the largest variable. A major concert tour with full LED wall, video-screen array and rigging lighting can dissipate 200-300 kW continuous through the rigging plus another 50-80 kW from the stage-rig audio amplifiers. The BMS reads the lighting load from the production-coordination schedule provided by the touring act and pre-cools the bowl in advance of the doors-open to handle the sustained sensible load.

The pyrotechnic and special-effects clearance after the halftime show or the concert encore is a separate HVAC consideration. Indoor pyrotechnics and CO2 effects release particulate and gas that has to be cleared from the bowl envelope before the audience egress. The BMS triggers a clearance sequence on the production-coordination signal — increased fresh-air rate, smoke-management dampers in clearance configuration, exhaust at the roof or the perimeter louvres ramped to full output. The clearance duration is typically 5-15 minutes depending on the load.

AS/NZS 3666 microbial control on stadium cooling towers

AS/NZS 3666.1, 3666.2 and 3666.3 govern the microbial-control duty on air-water interfaces in major venues. The cooling-tower duty under AS/NZS 3666.1 (design and installation) and AS/NZS 3666.2 (operation and maintenance) sits at the highest end of the stadium operator's risk profile. A major venue cooling-tower system handles the condenser-water rejection from the central chilled-water plant at 5-15 MW peak rejection during AFL Grand Final, Boxing Day Test and major-concert peak days. Cooling-tower aerosol from poorly managed water chemistry has been the source of multiple Legionella outbreaks at major venues globally, including the well-documented 2000 Melbourne Aquarium outbreak in a near-stadium precinct. The Australian Public Health regulators take the AS/NZS 3666 duty seriously and the operator carries continuous responsibility.

The AS/NZS 3666 duty applies to every air-water interface — cooling towers, evaporative-cooling chambers, humidifier reservoirs, indirect-evaporative coolers, condensate trays on chilled-water coils and the AHU drain-pan system. The operator monitors water chemistry continuously, doses biocide on the cooling-tower schedule, services the AHU drain pans on the AS/NZS 3666.2 inspection cycle and maintains the documentation register for state public-health inspection.

Duct construction supports the AS/NZS 3666 duty by avoiding moisture accumulation in the supply and return paths. Sealed-seam Class A construction prevents condensation entry through duct joints. Internal duct insulation is specified with closed-cell or coated facing to prevent moisture absorption and microbial growth. The return-air path through the bowl, the concourse and the back-of-house is designed to avoid water-fixture proximity that would carry aerosol into the AHU return. The shower-zone exhaust never connects to the AHU return.

NCC Vol 1 Section J energy efficiency and NABERS Energy rating

The Australian National Construction Code (NCC) Volume 1 Section J sets the energy-efficiency compliance pathway for the major-venue building. Section J Part J5 covers HVAC equipment efficiency, Part J6 covers ductwork insulation, Part J7 covers heat-recovery requirements and Part J8 covers the BMS sequencing for energy management. The compliance pathway is either prescriptive (meet each clause individually) or performance (meet the overall energy target through a J-Verify modelling exercise).

Major-venue projects typically take the performance pathway because the venue's operational profile is unusual — the building runs at 5% occupancy for most of the year and at 100% occupancy for fourteen Saturday afternoons a season. The performance pathway allows the design to oversize the AHUs for the peak day while running at deep setback for the non-event days, with the BMS sequence-of-operation managing the transition. NABERS Energy compliance for the venue runs against the major-event-venue rating tool with a typical target of 5-star equivalent (the rating tool is still maturing for major venues compared with the office tool).

Heat recovery on the kitchen exhaust make-up air is part of the Section J Part J7 pathway where the geometry allows. The plate or wheel heat exchanger transfers thermal energy from the warm kitchen exhaust to the cold make-up air during the heating season, reducing the heating load on the make-up air AHU. The recovery duct is 304 stainless on the SB-ZF1500 stitchwelder line. The heat exchanger media is selected for the grease-vapour cross-contamination resistance.

Demand-controlled ventilation on the bowl outdoor-air rate during low-event mode saves 60-80% of the ventilation energy on the average non-event day. CO2 sensors in the bowl return-air path drive the AHU outdoor-air damper position. When the bowl is unoccupied the AHU runs on minimum outdoor-air for envelope conditioning only. When the bowl is at event occupancy the AHU runs on full design outdoor-air per AS 1668.2. The CO2-based control is the largest single energy-saving lever on the major-venue building.

Variable-speed drives on every chilled-water pump, condenser-water pump, AHU supply fan and AHU return fan track the system load continuously. The pump and fan affinity laws mean a 50% load reduction corresponds to 12.5% power on the variable-speed drive (cube law on the fan and pump), so the energy saving from VFDs on a venue running at non-event load is substantial. The chiller-plant sequence under Section J Part J5 stages the chillers from minimum-energy to high-load as the cooling load ramps from non-event setback to event peak.

AS 1668.2 stadium ventilation rates by sport and event mode

Different sport and event modes carry different occupancy patterns and different ventilation requirements. AS 1668.2 Class 9b assembly default of 10 L/s per person plus the area component applies in the general case, but the stadium operator carries the obligation to size for the worst-case mode the venue is configured to support.

AFL home-and-away match at 50,000-80,000 attendance is a 90-minute load with a 30-minute pre-match build, a 15-20 minute halftime spike and a 30-45 minute post-match exit. The bowl AHU sizes for the full attendance at 7.5 L/s per person spectator default. The concourse AHU sizes for the halftime spike at one person per square metre concourse occupancy. The kitchen exhaust sizes for the halftime spike at 100% of nominal capacity.

NRL match at 30,000-50,000 attendance follows the same profile as AFL but with a shorter 80-minute match clock and a shorter halftime. State of Origin at 80,000+ attendance pushes the stadium beyond standard AFL load. Wallabies test at 40,000-80,000 carries the same envelope. A-League and rugby union sit in the 20,000-40,000 attendance bracket. Cricket Test attendance at 80,000-100,000 across a five-day window is a sustained rather than peak load, with the spectators dispersed across the 8-hour playing day rather than concentrated in a 90-minute window.

Concert mode at 50,000-80,000 attendance is a single-event peak load with the venue at maximum capacity for the 3-4 hour show plus the support acts. The bowl AHU sizes for full attendance. The LED-wall and stage lighting load lifts the sensible-cooling demand by 200-300 kW. The acoustic configuration drops to concert-mode NC 25 in the seating zone.

Gala dinner mode at 1,000-3,000 attendance in the bowl-floor or ballroom configuration is a banquet-density load (1 person per 1.5 square metre) for 4-6 hours with the catering precinct running at maximum output. The bowl AHU sizes for banquet density rather than spectator density. The kitchen exhaust runs at full output across the 4-6 hour service.

E-sports tournament mode at 5,000-15,000 attendance combines the seated-audience load with the LED-wall and broadcast-lighting envelope. The audience is more sedentary than a sport crowd and the LED load runs continuously across the 4-8 hour event. The BMS reads the configuration mode and applies the appropriate AHU setpoint.

Royal Show or major exhibition mode at the venue's full floor reconfiguration handles the convention-floor displacement supply across the exhibition halls with the standard 10 L/s per person plus 0.3 L/s per square metre area component. Royal Show events at venues like the Sydney Showground and the Brisbane RNA Showgrounds carry their own seasonal HVAC peak.

BMS sequence-of-operation for a major venue

The BMS sequence-of-operation is the document that ties the design intent to the operational reality across the venue's 30-year lifecycle. The sequence covers every AHU, VAV terminal, motorised damper, exhaust fan, smoke-management damper, chilled-water pump, condenser-water pump, cooling tower, chiller, boiler, heat recovery wheel, CO2 sensor, humidity sensor, temperature sensor, occupancy sensor and the roof-position sensor at retractable-roof venues. The sequence is typically 200-400 pages on a flagship venue and is the reference for the facilities team across the operational life of the building.

Event-day sequence handles the pre-event AHU ramp-up from setback to full output, the in-event tracking of occupancy and CO2, the halftime spike on the kitchen exhaust and the concourse AHU, the post-event ramp-down to setback, and the cleaning-crew night-shift mode that allows access while maintaining minimum envelope conditioning. The pre-event ramp-up typically starts 2-3 hours before doors-open to bring the bowl to the spectator setpoint with the structural mass pre-cooled. The post-event ramp-down runs across the 2-3 hour egress window.

Non-event-day sequence handles the deep setback that delivers the NABERS Energy compliance for the building. The bowl AHU runs on minimum outdoor-air for envelope conditioning only. The hospitality suites run at admin setpoint (22 degrees C, 40-50% RH) with reduced occupancy. The concourse and back-of-house run on standard office setpoint. The chiller plant runs the smallest-capacity chiller on the duty schedule.

Smoke-mode sequence handles the AS 1668.1 response to a fire-detection signal. The sequence reads the zone-of-origin and activates the appropriate smoke-spill fans, opens the smoke-exhaust dampers in the zone of origin, closes the smoke-resistant dampers at the zone boundary, runs the stair-pressurisation fans, runs the lift-lobby pressurisation, opens the make-up-air louvres at the concourse and the perimeter, and shuts down the standard AHU supply to the affected zone. The sequence is tested at commissioning, re-tested annually under AS 1851 and re-validated whenever the venue configuration changes.

Roof-mode sequence at retractable-roof venues (Marvel Stadium, Rod Laver Arena, John Cain Arena, Margaret Court Arena) reads the roof-position sensor and switches the bowl supply, return, smoke-management and outdoor-air strategies as a single block. The sequence allows for the 20-30 minute transition between open and closed without overcooling on the leading edge or undercooling on the trailing edge.

Event-mode sequence handles the concert-mode acoustic transition, the gala-dinner banquet-density transition, the e-sports tournament configuration and the Royal Show or exhibition-floor reconfiguration. Each event mode sets a different AHU setpoint, fresh-air rate, supply temperature, acoustic target and lighting interlock. The BMS applies the appropriate sequence on the production-coordination signal from the venue operations team.

SBKJ machinery configuration for the major-venue programme

The SBKJ standard machinery configuration for a major-venue HVAC duct programme delivers the 80,000-200,000 square metre fabrication scope across the 24-60 month construction window at sealed-seam Class A construction with full traceability for the AS 1668.1 smoke-management documentation, the AS 4254 duct construction class certification, the AS/NZS 2107 acoustic compliance and the NABERS Energy supporting documentation.

SBAL-V auto duct production line. The workhorse for the bulk galvanised rectangular ductwork on the bowl supply, the concourse, the hospitality back-of-house, the exhibition hall, the convention floor and the back-of-house. Configured for the gauge range 0.6-1.2 mm GAL with TDF flange tooling and the standard 30 mm Pittsburgh-equivalent corner connector. In-line notching, beading, folding and flange-forming stations sequence without operator intervention. 24-hour shift capacity at 800-1200 fittings per shift on the standard duct cross-section range. The SBAL-V is selected as the bulk programme line because the major-venue duct geometry is dominated by rectangular cross-sections in the 0.8-1.2 mm gauge band.

SBAL-III auto duct line. The second-line configuration for parallel running on the smoke-spill duct heavy-gauge coil schedule (1.6-2.0 mm GAL) and the kitchen exhaust make-up-air programme. The SBAL-III is the SBAL-V predecessor and runs effectively on the parallel programme alongside the bulk SBAL-V line. The configuration choice between SBAL-V and SBAL-III is documented in the dedicated SBAL-V vs SBAL-III comparison.

SBSF-1525 stitchwelder. Automatic spiral stitchwelder producing high-volume welded round duct in the 300-1525 mm diameter range. Suitable for the bowl-supply round fascia plenum where the geometry calls for a welded round profile, the round smoke-shaft sleeve sections through fire-rated penetrations, and the high-volume kitchen exhaust make-up air round risers. The SBSF-1525 produces seam-welded round duct at a higher leakage-class than spiral-wound duct, suitable for the sealed-seam Class A pressure class of major-venue construction.

SB-ZF1500 stitchwelder. Automatic stitchwelder configured for 304 stainless commercial kitchen exhaust make-up air, theatre NC 25 acoustic ducts, locker-room shower-zone exhaust and the laundry drying-line risers. The stainless construction resists chloramine, grease vapour and steam exposure across the wet-zone return-air path. The SB-ZF1500 produces the seam at sealed-seam Class A leakage class with full weld traceability.

SBFB-1500 spiral former. Continuous spiral-wound duct former in the 200-1500 mm diameter range on a 0.6-1.5 mm galvanised coil. Spiral duct is lighter than rectangular at equivalent area, has lower pressure drop and is the standard for stadium concourse ring distribution, the atrium supply on a multi-storey hospitality tier, and the bowl smoke-spill secondary spurs where the round geometry suits. The SBFB-1500 is the largest production capacity spiral former in the SBKJ range and handles the major-venue concourse programme without straining the line.

SBPC1500 plasma cutter. CNC plasma cutting for stainless fittings, access doors, cleanout panels, test ports, register cuts and the architectural detail on the suite penetration. The SBPC1500 handles 1500 mm sheet width at the gauge range required for major-venue fittings (0.6-3.0 mm). The plasma is integrated with the SBAL-V and SB-ZF1500 in the standard fabrication workflow.

SBLR-600 welder. Longitudinal-seam welder for grease-duct seams to NFPA 96 liquid-tight specification, smoke-spill duct heavy-gauge seams to AS 4254 Section 7 specification, and stainless fittings on the kitchen exhaust make-up air. The SBLR-600 is the standard manual welding station for the heavy-gauge programme.

SBTF-1500/1602/2020 TDF flange formers. Standalone or in-line TDF (Transverse Duct Flange) formers producing the 30 mm Pittsburgh-equivalent corner connector for the rectangular duct sections. The SBTF-1500 handles the 1500 mm flange face, the SBTF-1602 the 1602 mm flange face for the larger cross-sections on the bowl supply, and the SBTF-2020 the 2020 mm flange face for the heavy-gauge smoke-spill spine. The TDF connector is the standard rectangular-duct joint across the major-venue fabrication programme.

For the bulk programme the workflow is: SBAL-V running the bowl-supply galvanised rectangular ductwork in continuous shift, SBFB-1500 running the concourse round ring-main spiral ductwork in parallel, SB-ZF1500 running the kitchen exhaust make-up air in a third parallel stream, SBLR-600 manual stations producing the grease-duct seams and the smoke-spill spine, SBPC1500 plasma cutting the fittings and access doors. The line configuration delivers the 80,000-200,000 square metre programme across the construction window without bottleneck on any single station.

The fabrication shop layout supports the major-venue programme with continuous coil-feed stocks for the SBAL-V and SBAL-III on the rectangular galvanised programme, separate coil-feed stocks for the stainless on the SB-ZF1500 line, dedicated weld-station bays for the SBLR-600 manual welding, and the SBPC1500 plasma on a CNC bay with the access-door and fitting programme. The progressive site delivery is on a steel-frame stillage system that loads the fabricated duct in spool sequence with the architectural cladding programme on the venue.

Acoustic targets by zone — AS/NZS 2107:2016

AS/NZS 2107:2016 sets the recommended design sound levels for the interior of buildings, with the major-venue zones falling across a wide range from NC 20 in broadcast booths to NC 45 in spectator seating. The acoustic specification drives the duct construction class, the internal lining, the silencer placement, the AHU isolation and the supply diffuser selection.

Spectator bowl seating NC 35-45 — the crowd soundscape and the broadcast PA sit well above any mechanical noise. AHU and ductwork acoustic compliance is achieved with standard sealed-seam Class A construction without internal lining.

Concourse circulation NC 35-40 — the crowd noise during the halftime spike and the open soundscape of the public concourse tolerate higher NC. Standard sealed-seam Class A.

Corporate hospitality suite NC 25-30 — the suite holder experience requires invisible HVAC. Internal acoustic lining on the last 6 metres of supply, in-line attenuators, low-velocity supply diffusers, vibration-isolated hangers.

Premier-tier super suite NC 20-25 — the highest-spec suite tier carries double-walled silencers, structural acoustic isolation and the bespoke acoustic overlay specified by the interior architect.

Broadcast booth and press booth NC 20-25 — the announcer's microphone picks up any background mechanical noise. Double-walled silencers on supply and return. Structural acoustic isolation of the AHU plinth. Dedicated AHU with stable temperature.

Resident-show theatre and concert configuration NC 25-30 — the audience is listening to the show through the venue PA. Internal acoustic lining on the supply duct, dedicated acoustic-attenuated supply diffusers, vibration-isolated AHU plinth.

Indoor arena concert mode NC 25 in the seating zone — the bowl AHU re-sequences from sport mode (NC 35-40) to concert mode (NC 25) on the production-coordination signal. The supply velocity drops, the internal-lined supply duct kicks in, the suite AHUs coordinate.

Convention plenary and conference auditorium NC 25-30 — the lecture audience is listening to a single speaker through the venue PA. Internal acoustic lining on the last 6 metres of supply, demand-controlled CO2 fresh air, dedicated speaker-zone supply at the podium.

Exhibition hall and trade-show floor NC 35-40 — the open exhibition soundscape and the stand-exhibitor audio tolerate higher NC. Under-floor displacement supply through floor diffusers.

Function room and ballroom NC 25-30 — the gala-dinner audience is in conversation with table mates and the venue PA delivers the awards-night and keynote audio. Internal acoustic lining on the supply duct, dedicated AHU per partition sub-zone, low-velocity supply diffusers.

Locker room and training room NC 35-40 — the athletic occupancy tolerates higher NC and the shower-zone steam masks any HVAC noise. Standard sealed-seam Class A on the supply, stainless on the wet-zone return.

Medical room and anti-doping suite NC 30-35 — the clinical-treatment envelope requires a quieter acoustic than the locker room. Dedicated AHU with MERV 13-14 filtration and pressure differential.

Admin office and back-of-house NC 35-40 — the standard commercial-office acoustic envelope. Sealed-seam Class A on the supply.

CIBSE TM52 overheating and the Australian climate challenge

CIBSE TM52 (Technical Memorandum 52, the Limits of Thermal Comfort: Avoiding Overheating in European Buildings) is the methodology referenced in Australian major-venue design for assessing overheating risk in occupied spaces. Australian climatic conditions vary dramatically across the venue portfolio — Adelaide Oval at 42 degrees C dry bulb in mid-summer drives a different design case than Melbourne's MCG at 32 degrees C, Sydney's Allianz Stadium at 28 degrees C or Hobart's Bellerive Oval at 22 degrees C peak summer.

The TM52 methodology assesses three criteria — hours of exceedance above the upper limit of the adaptive comfort temperature, weighted exceedance of severity above the threshold, and absolute exceedance above the upper limit. The Australian application uses the local design-day data (BoM 1% summer DBT and MWB by capital city) to set the design case and then runs the TM52 assessment on the post-occupancy energy model to confirm the venue does not exceed the overheating threshold.

Adelaide Oval and Perth's Optus Stadium carry the most demanding TM52 assessment in the Australian portfolio because the local summer DBT routinely exceeds 40 degrees C in the AFL pre-season and pre-finals window. The bowl AHU sizing margins on these venues are larger than the equivalent Melbourne or Sydney venue to handle the elevated DBT. The hospitality suite humidity setpoint is critical because the radiant temperature from the elevated outdoor surfaces drives the suite cooling load through the glass facade.

Brisbane's Suncorp Stadium and the venues in the tropical regions (Cairns Convention Centre, the Country Bank Stadium Townsville) carry an additional latent-load consideration because the humidity exposure during the wet season exceeds the temperate-zone venues. The dehumidification capacity on the bowl AHU is sized for the elevated latent load and the cooling-tower duty is correspondingly higher.

Major-venue HVAC duct programme schedule

A 60,000-seat new-build major-venue HVAC duct programme typically runs 14-22 months end-to-end from shop-drawing approval through fabrication and site delivery. The schedule breaks down: 3-4 months design and shop-drawing approval, 2-3 months machinery commissioning if a dedicated SBKJ line is set up for the project, 9-14 months fabrication and progressive site delivery, 1-2 months commissioning and balancing. Olympic-readiness or major-event-readiness venues compress this to 18 months by running parallel SBAL-V and SBAL-III lines for bowl, concourse, hospitality suite and back-of-house simultaneously.

The shop-drawing approval cycle is the longest single-thread item on the schedule. The architect, the structural engineer, the building services consultant, the fire engineer, the acoustic engineer and the certifier all sign off on the duct routing, the smoke-management strategy, the AS 1668.1 sequence-of-operation, the AS/NZS 2107 acoustic compliance and the NCC Section J energy compliance. The approval cycle takes 4-6 weeks per area for the first issue and 2-3 weeks for revisions.

The fabrication and progressive site delivery is the longest aggregate item. The duct is fabricated in spool sequence with the architectural cladding programme and delivered to site on a steel-frame stillage. The SBAL-V production schedule on the bulk programme runs continuously across the 9-14 month fabrication window with the SBAL-III on the parallel heavy-gauge programme. The progressive site delivery is on a coordinated schedule with the structural completion, the architectural cladding and the mechanical-services installation.

Commissioning and balancing closes the schedule. Every AHU, VAV terminal, motorised damper, exhaust fan, smoke-management damper and BMS sequence is commissioned against the design schedule. The bowl supply, the concourse, the suites, the kitchens and the back-of-house are balanced to the design fresh-air rate and pressure differential. The AS 1668.1 smoke-mode sequence is verified by simulated alarm at each zone of origin. The roof-position interlock at retractable-roof venues is verified by switching the roof and confirming the bowl AHU and smoke-management response. The balancing report, the AS 1851 fire and smoke damper register, the BMS sequence-of-operation document and the as-built duct drawing set are issued to the venue operator.

ARBS 2026 Sydney — meet the SBKJ team

SBKJ Group will be exhibiting at ARBS 2026 in Sydney from 12-14 May 2026 at the International Convention Centre Sydney at Darling Harbour, the venue this guide references throughout. ARBS is the Australian Air Conditioning, Refrigeration and Building Services exhibition — the largest HVAC-and-mechanical-services trade event in the Australian and South Pacific region. The 2026 event is hosted at the very venue where the under-floor displacement supply, the 5,000-delegate Aware Super Theatre and the AS 1668.1 smoke-management strategy described in this guide were designed and built.

The SBKJ engineering team will be on stand to discuss major-venue HVAC duct programmes with fit-out contractors, building-services consultants, mechanical engineers, architects and venue operators. The discussion topics include the SBAL-V auto duct line configuration for the bulk galvanised rectangular ductwork, the SBSF-1525 stitchwelder for the round seam-welded supply, the SBFB-1500 spiral former for the concourse ring-main, the SB-ZF1500 stitchwelder for the kitchen exhaust make-up air and the locker-room shower-zone exhaust, the SBPC1500 plasma cutter for the access doors and fittings, the SBLR-600 welder for the grease-duct seam and the smoke-spill spine. Booth visitors can also discuss the bespoke configuration for a specific upcoming major-venue project against the SBKJ engineering team's documented experience across the AFL stadium portfolio, the convention-centre programme and the indoor-arena rebuild cycle.

SBKJ Group is the Australian-positioned HVAC duct machinery supplier headquartered at Box Hill North VIC, with delivery, support and engineering across the Australian capital city portfolio and the regional centres. The standard engagement on a major-venue project is direct between the SBKJ engineering team and the fit-out contractor — the contractor specifies the configuration, SBKJ delivers the line, factory-acceptance-tests on the buyer's coil and stainless specifications, ships under sealed Incoterm to the contractor's workshop, commissions on site and trains the operators. SBKJ provides remote support on 72-hour response and a 10-year spare-parts continuity guarantee.

Cross-references and adjacent guides

This guide is the major-venue integration layer. The adjacent guides cover the deeper scope on specific components:

Stadium and Sports Venue HVAC Duct Guide — the original stadium HVAC duct reference with Olympic Brisbane 2032 and FIFA 2026 venue context.
Convention Centre and Exhibition Hall HVAC Duct Guide — the deeper convention-and-exhibition-floor reference.
Concert Hall and Performing Arts Centre HVAC Duct Guide — the deeper concert-and-performance reference for the acoustic transition.
Commercial Kitchen Exhaust HVAC Duct Guide — the deeper kitchen-exhaust reference for the 15-30 cookline major-venue programme.
Broadcasting TV and Radio Studio HVAC Duct Guide — the deeper broadcast-and-press-booth reference for the NC 20-25 acoustic envelope.
Hotel and Hospitality HVAC Duct Guide — the adjacent reference for the venue-integrated hotel tower.
Acoustic HVAC Duct Lining and Attenuator Guide — the deeper acoustic reference for the suite, broadcast and theatre acoustic programme.
AS 1668.2 Australian Ventilation Code Reference — the code reference for the outdoor-air rate calculation by zone.
AS 4254 Australian Ductwork Construction Reference — the duct construction class reference for the seal class and pressure class.
SBAL-V vs SBAL-III — the comparison between the recommended SBAL-V and the SBAL-III predecessor.
Auto Duct Line ROI Cost Analysis — the financial business case for the SBAL-V capacity investment.
BIM Integration HVAC Duct Fabrication — the BIM-and-shop-drawing reference for the major-venue coordination cycle.

SBKJ engagement on major-venue projects

SBKJ Group, headquartered in Box Hill North VIC, supports major-venue HVAC duct fabrication programmes across Australia and our 100+ country installed base. The standard engagement is direct between the SBKJ engineering team and the fit-out contractor — the contractor specifies the configuration against the project brief, SBKJ delivers the line, factory-acceptance-tests on the buyer's coil and stainless specifications, ships under sealed Incoterm to the contractor's workshop, commissions on site and trains the operators. SBKJ provides remote support on 72-hour response and a 10-year spare-parts continuity guarantee.

For major-venue projects where the contractor is new to the 80,000-200,000 square metre fabrication scale, SBKJ can second a senior engineer to the contractor's project for the first three months of high-volume production. The seconded engineer supports the contractor's production setup, the shop-drawing-to-fabrication translation, the quality-assurance workflow and the AS 4254 sealed-seam Class A documentation chain that the certifier reviews at building permit. SBKJ will also support the contractor's coordination with the venue operator on the as-built drawing set, the BMS sequence-of-operation document and the AS 1851 fire-and-smoke damper register that the operator carries through the building's life. The SBKJ point of contact is a single senior engineer, not a salesperson, who carries the account from machinery delivery to programme handover. The SBKJ promise is the 12-hour engineering reply, the 72-hour spare-parts dispatch and the 10-year continuity guarantee.

Contact the SBKJ Engineering Team at sales@sbkjduct.com, phone +61 435 074 994 or visit sbkjduct.com. SBKJ Group is headquartered at Box Hill North VIC 3129 with delivery and support across the Australian capital city portfolio and the regional centres. Meet the team at ARBS 2026 Sydney 12-14 May 2026 at ICC Sydney.

Discuss your major-venue project with an SBKJ engineer →

FAQ

What outdoor air rate applies to an Australian stadium bowl under AS 1668.2?

7.5 L/s per person at design occupancy under AS 1668.2 Class 9b assembly default and ASHRAE 62.1 equivalent. A 50,000-capacity bowl at peak ticket sale demands 375,000 L/s of fresh air across the two-hour load window. CO2 setpoint is relaxed to 2,500-3,000 ppm at peak versus 800-1,000 ppm in an office because the dwell time is short, the activity is sedentary and CO2 dispersion to the open or roof-vented bowl is effectively unlimited. Hospitality suites and corporate boxes lift the rate to 10 L/s per person with MERV 13 filtration.

How does HVAC switch between roof-open and roof-closed modes at Marvel Stadium and Rod Laver Arena?

Retractable-roof venues run two interlocked HVAC modes. Roof-open mode operates the bowl on natural ventilation and perimeter dehumidification only, with suites and concourse on full mechanical service. Roof-closed mode activates full bowl AHU output at 40-60 ACH for the seating volume with smoke management ducts ready to AS 1668.1 stand-by. The BMS reads roof-position sensors and switches the supply, return, smoke-management and outdoor-air strategies as a single block. The interlock is safety-critical and must fail to roof-closed HVAC operation.

What is the smoke spill duct construction class for a stadium concourse under AS 4254 and AS 1668.1?

250 degrees C for 120 minutes in the bowl smoke-spill spine and 600 degrees C for 60 minutes in the smoke-shaft sleeve through fire-rated walls and slabs to AS 1530.4. Wall thickness 1.6-2.5 mm galvanised G300 or 304 stainless welded continuously, no transverse joints in the fire-rated penetration zone, fire-rated hangers to match the wall and slab penetration rating, intumescent gaskets under AS 1682, and the entire register documented for AS 1851 in-service inspection on a six-monthly cycle.

How does HVAC scope change between MCG Northern Stand redevelopment and Optus Stadium Perth new build?

The MCG redevelopment is bounded by the existing structural grid, the existing chilled-water plant capacity and the existing main-switch room locations. Optus Stadium was a greenfield Multiplex-led 2018 project where the HVAC architecture was set from concept — central plant sized for the full 60,000-seat bowl plus 70 corporate suites plus full concourse plus four restaurants, with smoke-management strategy embedded in the architectural form. New builds run sealed-seam Class A throughout, common backbones and single BMS. Heritage redevelopments work with what is there.

What acoustic specification applies to a stadium bowl versus a corporate hospitality suite?

AS/NZS 2107:2016 sets the targets. Bowl seating tolerates NC 35-45 because the crowd soundscape and the broadcast PA sit well above any mechanical noise. Concourse circulation NC 35-40. Corporate hospitality suites NC 25-30. Broadcast booths NC 20-25 with double-walled silencers and structural acoustic isolation. Locker rooms NC 40. Indoor-arena concert mode sizes the bowl AHU for NC 25 in seating because the audience is listening to amplified music.

How is stadium kitchen exhaust designed under AS 1668.2 for 50,000 patrons at halftime?

15-30 commercial kitchens, food outlets, beer halls and bars across the concourse. Each cookline gets a Type I hood at 80-125 fpm capture velocity under AS 1668.2 Section 9 and NFPA 96 reference, 16-gauge black-steel welded liquid-tight grease ducts sloped 1:50, access doors every 3.5 m, fire-rated enclosure through occupied space, dedicated MUA at 70-90% of exhaust. Halftime spike handled by oversize fans on VFD setback at low-event mode. Discharge schedule coordinated with the spectator-bowl outdoor-air intakes.

What HVAC is required for a stadium locker room, training room and player shower?

AS 1668.2 Class 9b athletic with steam-and-vapour management overlay. Shower-zone exhaust 25-30 L/s per fixture continuous, locker-zone supply 10-15 ACH MERV 13, dedicated drying-line risers, 316L stainless duct in the wet-zone return-air path against chlorinated-water corrosion. Smoke management to AS 1668.1. AS/NZS 3666 microbial-control overlay on air-water interfaces because Legionella risk from shower aerosols travels into the return-air path if the air-handler return is poorly located.

How does ICC Sydney handle the 35,000 sqm exhibition floor and the 8,000-seat theatre simultaneously?

Exhibition halls run under-floor displacement supply at 0.25-0.5 m/s at floor level rising through stand exhibitors at one person per square metre peak. The 8,000-seat Aware Super Theatre runs conventional overhead supply at NC 25 with demand-controlled CO2 fresh air. Both share the central chilled-water and condenser-water backbones with dedicated AHUs and independent BMS sequence-of-operation. Each hall can be sub-zoned by movable partitioning.

What duct construction is specified for the MCEC Plenary Hall and the 2018 South Wharf extension?

Sealed-seam Class A to AS 4254.1 throughout. Galvanised G300 for general supply and return, 304 stainless on kitchen exhaust make-up air, internal acoustic lining on the last 6 m of supply into the Plenary Hall to drop NC to 25, dedicated smoke spill ducts to AS 1668.1 with 250 C/120 min rating, BMS coordinated with the venue-mode schedule (lecture, banquet, exhibition, concert, gala dinner) so AHU setpoint and fresh-air rate change with the configuration of the day.

What SBKJ machinery configuration suits a stadium, arena or convention centre fabrication programme?

SBAL-V auto duct line as the workhorse for bulk galvanised rectangular at 0.8-1.2 mm GAL (bowl supply, concourse, hospitality back-of-house). SB-ZF1500 stitchwelder for 304 stainless kitchen exhaust make-up air and theatre NC 25 acoustic ducts. SBFB-1500 spiral former for 600-1500 mm round concourse and ring-main. SBSF-1525 stitchwelder for high-volume round supply. SBPC1500 plasma cutter for stainless fittings and access doors. SBLR-600 welder for grease-duct seams and heavy-gauge smoke-spill duct seams. For 2.0-2.5 mm smoke spill, SBAL-III sheet-feed combined with manual welding stations.

12-hour reply

Got a spec question on a stadium, arena, convention centre or exhibition hall HVAC duct brief? An SBKJ mechanical engineer in Box Hill North replies within 12 hours — not a salesperson. Meet the team at ARBS 2026 Sydney 12-14 May at ICC Sydney, Darling Harbour.

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