Why convention centre HVAC is unique
A convention centre is not a building — it is an event factory. The HVAC plant has to serve a 50,000 m² hall that is empty on Monday, half-full of forklifts and stand-builders on Tuesday, packed with 30,000 visitors on Wednesday, and back to a vacuum cleaner crew on Thursday. The same plant simultaneously conditions a 5,000-seat plenary auditorium with NC-25 acoustic targets, half a dozen 200-seat conference rooms, a commercial kitchen with 30 cooking stations and a Type I grease exhaust riser, a hotel-attached pre-function arcade, and a sometimes-forgotten retail concourse. Almost no other building type combines the volume, occupancy swing, mixed-use density and assembly-occupancy life-safety requirement of a convention centre. The ductwork has to handle all of it.
The first thing that surprises engineers new to the typology is the scale of the volume. A typical exhibition hall is 20,000–100,000 m² of column-free floor area with ceiling heights of 10–20 m. ICC Sydney's largest hall sits at around 32,500 m² across three contiguous spaces with 8 m to 14 m clearance to the structure. MCEC's combined Plenary–Exhibition footprint is over 70,000 m² of usable floor area. Las Vegas Convention Center after its West Hall expansion ranges past 200,000 m² of total floor area in a single contiguous campus. The cubic volume is enormous, and the HVAC plant must condition it without overwhelming the occupant zone with cold supply air or generating audible turbulence.
The second surprise is the load swing. An idle exhibition hall with two cleaners and a service technician needs almost no cooling — a few hundred watts of internal heat plus the envelope solar gain. Twelve hours later the same hall has 30,000 visitors generating roughly 100 W of sensible heat each (3 MW), 200 vendor stands with combined 1.5 MW of equipment lighting and electronics, plus the lighting plant for the hall itself. The HVAC ductwork has to deliver an order-of-magnitude airflow change between idle and event-day peak — and the building management system has to sequence it without long pull-down lag.
The third surprise is the smoke management. Under both NFPA 92 in the United States and AS 1668.4 in Australia, large-volume spaces over 5 m ceiling height are treated as atria for smoke management purposes. The design fire heat release rate ranges 5–15 MW depending on combustible loading from booths, stored exhibits and packaging materials. Mechanical exhaust fans must clear the smoke layer to keep the interface at least 2.5 m above the highest occupant walking surface for the design egress duration. Makeup air must enter at low level at velocities below 1.0 m/s (200 fpm) to avoid disrupting the smoke plume. The ductwork carrying both supply and exhaust must be sealed to SMACNA leakage Class 3 or better — leakage in a smoke management system is not a comfort issue, it is a life-safety issue.
This guide walks through every layer of convention centre HVAC ductwork — the hall typology, the standards, the materials, the diffusion strategy, the smoke management, the acoustic targets, the kitchen exhaust, the construction phasing and the sustainability ratings. It then maps SBKJ's machinery onto the typical procurement packages and explains how mechanical contractors building convention centre projects use SBKJ duct lines, spiral tubeformers and TDF flange formers to fabricate the galvanised rectangular and round content of the duct package on site or in their nearby fabrication shop.
The seven facility types inside a convention centre
Before the ductwork can be sized, the design team has to break the building into its component facility types. Each type has a different ventilation rate, acoustic target, smoke management strategy and fitout finish — and the duct specification follows the typology, not the gross floor area.
1. Large exhibition hall
The signature space — typically 20,000–60,000 m² per hall, 10–20 m ceiling, column-free or wide-grid columns. Hosts B2B trade shows, FMCG expos, automotive launches, vehicle exhibitions, machinery shows and the occasional concert or sporting event. Ventilation rate per ASHRAE 62.1 is 7.5 L/s per person plus 0.3 L/s per m² floor; AS 1668.2 reaches a similar number through a different occupancy-density methodology. Acoustic target NC-40 — less stringent because ambient activity from booths, demonstrations and crowd noise dominates. Smoke management is the dominant life-safety element. Diffusion strategy is increasingly stratified displacement ventilation with low-level perimeter slot diffusers and high-throw jet diffusers from the upper level for shoulder-season fast pull-down.
2. Conference and meeting rooms
Typically 50–500 m², 3–4 m ceiling, demountable partitions, classroom or boardroom layout. ASHRAE 62.1 ventilation rate 2.5 L/s per person plus 0.3 L/s per m² floor. Acoustic target NC-30 with full duct lining and attenuators on every supply and return branch. VAV terminal units with demand-controlled ventilation tied to CO2 sensors are standard. Diffusion is overhead linear slot or perforated face. The volume is small relative to the exhibition hall but the count is high — a typical convention centre runs 30–80 meeting rooms across multiple floors, each with its own VAV terminal and zone control.
3. Plenary auditorium
The pinnacle space — 1,000–5,000 seats, raked or dished seating, dedicated audio and video infrastructure, sometimes retractable seating for multi-mode use. Acoustic target NC-25 — the most stringent in the building. Diffusion strategy is displacement ventilation under raked seating with a low-velocity supply plenum, return at high level above the proscenium. Dedicated AHU with sound-attenuated supply and return paths, double attenuators where the supply main passes any plant room. Smoke management for 5,000+ seat assembly is treated under NFPA 101 Chapter 13 assembly occupancy or AS 1668.4 — typically a dedicated smoke control system with one-hour-rated exhaust ductwork.
4. Catering kitchen
Commercial kitchen serving banqueting, catering for the conference rooms and food service for the exhibition hall food court. Cooking line spans 20–40 stations, mix of solid-fuel grills, woks, fryers, ovens, steamers and dishwasher. Type I grease exhaust hood over solid-fuel and high-grease cooking, Type II vapour hood over steam and dishwasher. Schedule 10 carbon steel welded grease ducts per NFPA 96 standard for ventilation control of commercial cooking operations. Replacement air at 60–70 percent of exhaust volume — the kitchen runs slightly negative to stop grease vapour migrating to the dining floor. NC-45 acoustic target.
5. Back-of-house operations
Loading docks, marshalling yards, freight elevators, maintenance corridors, cleaner stores, security control room. AS 1668.2 minimum mechanical ventilation rates apply. Acoustic target NC-45 to NC-50. Diffusion strategy is overhead grilles and louvres. Loading dock ventilation often combines mechanical exhaust with infiltration from the dock door — the dock leveller seal is the dominant air-balance variable.
6. Hotel-attached pre-function and ballroom
Convention venues frequently sit alongside or above a host hotel — ICC Sydney, MCEC, BCEC, Adelaide Convention Centre, the Hilton hotel above Las Vegas Convention Center, the Hilton at Riyadh's RICEC, the Marina Bay Sands integrated with Singapore Expo. The pre-function arcade and ballroom space inherit the host hotel's acoustic and finish standard — NC-35 target, painted galvanised duct never visible, all fabric duct or finished plasterboard ceilings concealing the ductwork. AHU farms are usually shared with the convention centre but the BMS sequencing is hotel-priority on guest-arrival days.
7. Integrated retail
Coffee outlets, branded food and beverage, business centre, gift shop, sometimes a small department of a host retail brand. ASHRAE 62.1 retail ventilation rate 3.8 L/s per person plus 0.6 L/s per m² floor. NC-40 acoustic target. Most modern convention centres treat the retail concourse as a connector between the hotel and the exhibition halls, with continuous displacement ventilation along the spine and supplementary VAV at each retail tenancy.
Major Australian convention centres
Australia has a small number of very large convention centres, most operating to a similar HVAC playbook and most served by mechanical contractors using SBKJ machinery for the galvanised duct content. A walk-around of the major venues shows how the typology plays out at scale.
International Convention Centre Sydney (ICC Sydney)
ICC Sydney at Darling Harbour is the country's largest integrated convention, exhibition and entertainment precinct. Across three principal halls — ICC Sydney Exhibition, ICC Sydney Convention and ICC Sydney Theatre — the venue offers around 32,000 m² of contiguous exhibition space, a 8,000-seat ICC Sydney Theatre, an 8,000-seat tiered Plenary, and over 70 individual meeting rooms. The HVAC architecture combines large-volume displacement ventilation in the Exhibition Halls (low-level perimeter supply, high-level return through the structural ceiling void), dedicated AHUs per meeting room cluster, and acoustic-rated ductwork for the Plenary and Theatre. Dock ventilation, kitchen exhaust for the in-house catering serving over 9,000 guests, and hotel-attached pre-function spaces complete the package. ICC Sydney is the host venue for ARBS 2026 — Australia's premier HVAC, refrigeration and building services trade show in May 2026 — making it the most familiar convention centre to anyone in the Australian HVAC sector.
Melbourne Convention and Exhibition Centre (MCEC)
MCEC at South Wharf is one of the largest convention centres in the southern hemisphere with over 70,000 m² of total floor area across the connected MCEC and adjacent Pullman-precinct expansion. The Plenary seats 5,564 — the largest of its kind in the country — with an acoustic-rated displacement ventilation strategy under raked seating and dedicated AHUs above the upper proscenium. The Exhibition Halls run a column-free 30,000 m² with stratified displacement ventilation, high-throw jet diffusers from upper-level slot openings for shoulder-season fast pull-down, and an NFPA-92-equivalent atrium smoke management system designed to AS 1668.4. The kitchen exhaust riser serves the central banqueting kitchen and food court, with Schedule 10 black steel grease duct per NFPA 96.
Brisbane Convention and Exhibition Centre (BCEC)
BCEC at South Bank Brisbane operates around 30,000 m² of usable space across Plaza Auditorium (2,000+ seats), Great Hall (3,000+ seats), and three Exhibition Halls. The HVAC strategy is similar to MCEC and ICC Sydney with displacement ventilation in the exhibition halls, acoustic-rated ductwork in the Plaza and Great Hall, and a dedicated kitchen exhaust system serving the in-house catering. BCEC's hotel-attached spaces (Rydges South Bank) inherit hotel acoustic standards through the pre-function arcade.
Adelaide Convention Centre
Adelaide Convention Centre on the River Torrens runs approximately 20,000 m² of usable space across Halls A through L and a 1,000+ seat Panorama Ballroom. The ductwork package is smaller in absolute terms than the eastern-state venues but follows the same typology — displacement ventilation in the exhibition halls, acoustic ductwork in the Panorama Ballroom, dedicated kitchen exhaust riser, and integration with the adjacent Hilton Hotel pre-function spaces.
Perth Convention and Exhibition Centre (PCEC)
PCEC on Mounts Bay Road runs around 16,500 m² of usable space across Riverside Theatre, Bellevue Ballroom, Riverside Foyer, and Pavilion 1–4. The Riverside Theatre seats 2,500+ with acoustic-rated displacement ventilation. The Pavilions run conventional mixed ventilation with overhead supply and high-level return, reflecting an older architectural era — PCEC is currently in its multi-stage upgrade programme that is bringing the HVAC closer to the displacement-ventilation playbook used at MCEC and ICC Sydney.
Cairns, Darwin, Hobart and regional venues
Cairns Convention Centre at the Esplanade runs around 7,000 m² across the Main Hall, Halls A–D, and 12 meeting rooms. Darwin Convention Centre at the Waterfront precinct runs around 4,000 m² with a 1,500-seat plenary. Hobart's Hotel Grand Chancellor convention space and the Wrest Point Casino convention floor serve the southern Tasmanian market. These venues run the same typology as the larger convention centres but at a smaller scale, with fewer dedicated AHU farms and a tighter integration between the convention HVAC plant and the host hotel HVAC plant.
Major global convention centres
The HVAC playbook is similar across global venues, but the climate, code framework and procurement model differs. A short tour of the major international venues helps any project team benchmark their own scope against the world's leading examples.
Las Vegas Convention Center (LVCC)
LVCC across the South, Central, North and West Halls runs over 200,000 m² of total floor area, hosting AHR Expo (the world's largest HVAC, refrigeration and building services trade show) in odd years. The HVAC strategy is Nevada desert climate-driven — heavy-duty cooling load, displacement ventilation in the South Hall and the new West Hall expansion, atrium smoke management under NFPA 92, and integration with the connected Westgate Las Vegas Resort and the Hilton brand hotel. The West Hall expansion brought the venue's HVAC up to a current LEED standard with enhanced commissioning, demand-controlled ventilation, and tight-leakage duct construction.
Messe Frankfurt
Messe Frankfurt across Halls 1 to 12 runs over 367,000 m² of indoor exhibition space — the largest single trade fair complex in the world, hosting ISH (the global HVAC, sanitary and water trade show) in odd years. The HVAC strategy is German Energy Saving Ordinance (GEG) and DIN 1946 compliant with displacement ventilation, free-cooling economisers tied to the temperate central European climate, and tight-leakage duct construction validated by mandatory site leakage testing. Hall 12 — opened in 2018 — is one of the most architecturally and HVAC-progressive convention spaces in Europe with stratified displacement ventilation and a dedicated atrium smoke management system.
Fiera Milano Rho
Fiera Milano Rho on the western edge of Milan runs over 345,000 m² of indoor space across 24 pavilions, hosting MCE (Mostra Convegno Expocomfort, Italy's national HVAC trade show) in even years and Salone del Mobile (the international furniture fair). The HVAC strategy follows Italian UNI 10339 ventilation rates with displacement ventilation across the principal halls, atrium smoke management under EN 12101 series standards, and tight-leakage duct construction.
McCormick Place Chicago
McCormick Place across the South, North, West and Lakeside Buildings runs over 260,000 m² of total exhibition space — the largest convention centre in North America by exhibition floor area. HVAC strategy reflects Chicago's continental climate with heavy-duty heating and cooling, displacement ventilation, NFPA 92 atrium smoke management, and integration with the Hyatt Regency McCormick Place hotel.
Javits Center New York City
The Jacob K. Javits Convention Center on the West Side of Manhattan runs over 80,000 m² of exhibition space following its 2014 expansion. HVAC strategy reflects NYC code requirements with NFPA 92 atrium smoke management, displacement ventilation in the largest halls, and a green-roof-integrated thermal envelope strategy that has helped the venue achieve LEED Silver certification and NYC Local Law 97 compliance.
Riyadh International Convention and Exhibition Center (RICEC)
RICEC on King Abdul Aziz Road runs around 60,000 m² of exhibition and convention space and hosts Big 5 Saudi (the regional construction and HVAC trade show). The HVAC strategy is Saudi desert climate-driven with extreme cooling loads, displacement ventilation, NFPA 92 atrium smoke management, and a tight integration with the connected Hilton Riyadh hotel. SASO and Saudi Building Code references apply alongside ASHRAE 62.1.
ExCeL London
ExCeL on Royal Victoria Dock runs around 100,000 m² of exhibition space across the East and West buildings. HVAC strategy follows UK Building Regulations Part F (ventilation) and Part L (energy), with displacement ventilation, BS 5588 / EN 12101 smoke management for atria and large-volume spaces, and BREEAM Excellent rating. ExCeL hosted COP26 climate sessions and routinely hosts technology, automotive and FMCG trade shows.
Dubai World Trade Centre
Dubai World Trade Centre on Sheikh Zayed Road runs around 130,000 m² of exhibition space across Za'abeel Halls and Sheikh Saeed Halls. Climate-driven heavy-duty cooling, displacement ventilation, atrium smoke management, and integration with the Trade Centre Apartments and the Novotel and Ibis hotels on site. UAE Fire and Life Safety Code applies alongside ASHRAE 62.1.
Singapore Expo and Tokyo Big Sight
Singapore Expo at Changi runs around 100,000 m² of exhibition space across 10 halls plus the MAX Atria conference centre. Tokyo Big Sight runs around 95,000 m² across the East, West and South halls and the iconic Conference Tower. Both venues run displacement ventilation with tropical/temperate climate adjustments, NFPA-92-equivalent smoke management, and integration with the local hotel and transport network.
Code and standard framework
Convention centre HVAC ductwork sits at the intersection of half a dozen code frameworks. Getting the references straight at concept design saves months of rework at tender stage.
ASHRAE 62.1 — Ventilation for Acceptable Indoor Air Quality
The global default for ventilation rate procedure. Table 6.2.2.1 sets minimum outdoor air rates per occupant and per unit floor area for every space type — exhibition halls, conference rooms, auditoriums, kitchens, retail. Convention centres typically apply Table 6.2.2.1 as the floor and add a project-specific uplift (often 30 percent for IEQ credit under LEED v4.1) for premium spaces.
ASHRAE 90.1 — Energy Standard for Buildings Except Low-Rise Residential
The global energy benchmark. Convention centre HVAC plant must meet the minimum efficiency tables (chiller, fan, pump, motor) and the prescriptive duct leakage requirements — tight-leakage SMACNA Class 3 construction is increasingly required by ASHRAE 90.1 Section 6.4.4.2 for medium and high-pressure ductwork.
NFPA 92 — Standard for Smoke Control Systems
The dominant code for atrium and large-volume smoke management in the United States and most NFPA-aligned jurisdictions. Section 5 covers atrium smoke management with a smoke layer interface design at least 2.5 m (8 ft) above the highest occupant walking surface for the design egress duration. Section 4 covers stairwell pressurisation. Section 6 covers zoned smoke control with mechanical exhaust and pressurised supply to adjacent compartments.
NFPA 101 — Life Safety Code
Chapter 13 covers existing assembly occupancies and Chapter 12 covers new assembly occupancies. Means of egress, smoke control, fire-resistance compartmentation and ventilation tie back to the assembly occupancy load. For convention centres with 5,000+ seat plenary auditoriums, Chapter 12 governs.
IBC Chapter 10 — Means of Egress
The International Building Code Chapter 10 sets occupant load factor by space type, exit width per occupant, and travel distance limits. Exhibition hall occupant load factor under IBC Table 1004.5 is typically 1.4 m² per occupant (15 sq ft) for unconcentrated assembly and 0.65 m² per occupant (7 sq ft) for concentrated assembly. The HVAC team needs the IBC occupant load matrix to size the smoke management exhaust because the design fire heat release scales with occupant density and combustible loading.
AS 1668.1 — Fire and Smoke Control in Buildings
The Australian default for fire and smoke control ductwork — fire-resistance ratings for shaft ductwork, smoke spill ductwork, kitchen exhaust ductwork. Tested to AS 1530.7 for fire-resistance level of structural adequacy and integrity.
AS 1668.2 — The Use of Mechanical Ventilation in Buildings
The Australian default for mechanical ventilation rates. Section 5 sets the minimum outdoor air rate per occupant and per unit floor area, with Section 5.6 covering assembly occupancy spaces equivalent to ASHRAE 62.1 exhibition halls and auditoriums.
AS 1668.4 — Smoke Control in Atria and Large-Volume Spaces
Australian standard for atrium smoke management equivalent to NFPA 92. Smoke layer interface design at least 2.5 m above highest occupant walking surface, mechanical exhaust at ceiling, low-velocity makeup air below 1.0 m/s. Plume calculation methodology is similar to NFPA 92 with terminology adjustments.
NFPA 96 — Standard for Ventilation Control and Fire Protection of Commercial Cooking Operations
The dominant code for catering kitchen exhaust. Type I hood exhaust over solid-fuel and high-grease cooking with Schedule 10 carbon steel welded grease duct. Type II vapour hood over steam and dishwasher with 304L stainless or aluminised steel. Continuous external slope to grease reservoir at minimum 1 in 50 fall.
Exhibition hall HVAC architecture
The exhibition hall is the signature space of any convention centre and the most demanding HVAC environment. Modern designs converge on a stratified displacement ventilation strategy with mechanical smoke management — but the implementation details vary by climate, ceiling height, hall area and the degree of multi-mode use the venue is targeting.
Supply at low level, return at high level
Cool supply air enters at the perimeter of the hall through low-level slot diffusers — typically 1.5–2.5 m above floor level — at a face velocity of 0.2–0.4 m/s. The cool air pools at occupant level (a stratified layer typically 2.5–3 m deep), warming and rising by natural convection as it picks up heat from people, equipment and lighting. The warm air collects in the upper hall volume, displaced by the next layer of cool air below it. The return is taken at high level through ceiling void grilles or direct upper-hall returns, ducted back to the AHU.
The advantages over fully mixed overhead supply are substantial. Total airflow drops 20–40 percent because only the occupant zone needs to be conditioned, not the full cubic volume up to the ceiling. Thermal comfort improves because the cool zone sits at occupant height rather than being delivered cold from the ceiling. The natural stratification creates a smoke-clearing layer above 2.5 m that integrates seamlessly with the NFPA 92 smoke management strategy. And the duct routing is simpler — perimeter horizontal supply mains rather than a full overhead grid.
Jet diffusers for high-throw shoulder-season pull-down
Pure displacement ventilation has one weakness — slow shoulder-season pull-down. On the morning of an event, the hall has been idle overnight at minimum ventilation. The thermal mass of the floor and the structure has drifted up or down with the outdoor temperature. The displacement ventilation strategy at low velocity cannot pull the hall down to setpoint in under 4–6 hours. For a venue that opens its doors at 09:00 and needs occupant-zone temperature within ±1°C of setpoint, that is too slow.
The remedy is supplementary high-throw jet diffusers fed from upper-level supply mains. These are turned on for 1–2 hours before doors open, dumping cool air down from the ceiling at 6–10 m/s throw to mix the full hall volume. Once the hall is at setpoint, the jet diffusers throttle back and the displacement supply takes over as the dominant ventilation strategy. The BMS event calendar sequences the changeover automatically.
Fabric duct in feature applications
Fabric duct from manufacturers like Durkeesox, Prihoda and KE Fibertec has become a default option for the visible distribution layer in exhibition halls and pre-function spaces. The advantages are real — exposed fabric duct in white or printed colour reads as a feature ceiling element rather than industrial infrastructure; condensation risk on cold supply duct is eliminated because the fabric is a vapour-permeable membrane; the duct itself adds 2–3 dB of break-out attenuation versus rigid galvanised; and the duct can be tuned along its length with porosity changes to deliver a tailored discharge profile (uniform along the length, perimeter-weighted, or end-loaded). The disadvantages are equally real — fabric duct does not carry a fire-resistance rating, so it cannot be used on smoke management or stair pressurisation paths; cleaning requires removal and laundering; and the upfront cost per metre is 2–3x rigid galvanised. The default split is fabric duct on the visible exhibition hall distribution layer, rigid galvanised on everything else.
Perimeter under-glazing slot diffusers
Modern convention centres often have heavily glazed perimeters — daylight is a positive feature for exhibition halls and reduces electric lighting load. The glazing creates a perimeter cold-radiation issue in winter and a solar-gain issue in summer. The remedy is perimeter under-glazing slot diffusers — a continuous low-level supply slot mounted on the floor at the glazing line, blowing conditioned air upward to wash the glass. This counteracts cold downdraughts in winter, intercepts solar gain in summer, and integrates with the hall's displacement ventilation strategy. Most modern venues — ICC Sydney's Bayside Pavilion, MCEC's expansion, Hall 12 at Messe Frankfurt — incorporate perimeter under-glazing slot diffusers as a standard feature.
Atrium and large-volume smoke management
Smoke management in a convention centre exhibition hall is the single most important life-safety system in the building. The hall is filled with combustible materials — exhibitor stands, packaging, marketing collateral, sometimes vehicles or machinery on display — and a sustained fire generates massive smoke volumes that have to be cleared through the ceiling exhaust to keep the egress paths usable for the design evacuation duration.
Design fire heat release rate
NFPA 92 Section 5.5 and AS 1668.4 Section 4 set the methodology for calculating the design fire heat release rate. Convention centre exhibition halls typically design for 5–15 MW depending on combustible loading and sprinkler protection. A sprinkler-controlled fire is capped at 3–5 MW because the sprinklers limit the burning surface area. An unsprinklered fire — rare in modern halls — can reach 15+ MW. The design fire dictates the smoke production rate, the smoke layer rise time, and ultimately the mechanical exhaust capacity required to maintain the 2.5 m smoke layer interface.
Mechanical exhaust capacity
For a typical 30,000 m² exhibition hall with 12 m ceiling and a 5 MW sprinklered design fire, the mechanical exhaust capacity ranges 200–400 m³/s (400,000–800,000 cfm) split across 6–10 roof-mounted smoke exhaust fans. The fans are rated for 250°C operation for 1 hour to AS 1668.1 or UL 793 / EN 12101-3, and the ductwork between the fan and the discharge louvre is constructed in galvanised G90 steel with SMACNA leakage Class 3 sealing.
Makeup air at low level
Mechanical exhaust without makeup air rapidly depressurises the hall, slowing or reversing the smoke layer flow. NFPA 92 and AS 1668.4 require makeup air at low level — either through perimeter dampered openings (typically 4–6 m² per fan) or through dedicated low-velocity supply ductwork — at face velocities below 1.0 m/s (200 fpm) to avoid disrupting the smoke plume. The supply ductwork carrying makeup air is typically the same low-level perimeter slot diffuser system used for normal ventilation, with a smoke-mode override on the BMS that opens the dampers fully and forces the AHU to 100 percent outside air.
Smoke management for plenary auditorium
The plenary auditorium with 5,000+ seats is treated as a separate smoke compartment under NFPA 101 Chapter 12 / AS 1668.1. Smoke control is typically by zoned mechanical exhaust at the upper proscenium with pressurised supply to adjacent stair lobbies and pre-function spaces. The exhaust ductwork is fire-rated to FRL 60/60/60 per AS 1530.7 or 1-hour per UL 1978, constructed in galvanised G90 steel with rockwool or vermiculite fire-rated wrap depending on the fire-resistance test report.
Conference and meeting room HVAC
Convention centres typically have 30–80 dedicated conference and meeting rooms ranging from 50 m² breakout rooms to 500 m² pre-function ballrooms. The HVAC strategy is conventional VAV with demand-controlled ventilation — but the duct routing has to coordinate with the demountable partition system and the daily reconfiguration of the room layout.
VAV with demand-controlled ventilation
Each meeting room has a dedicated VAV terminal box on the supply duct main, with a CO2 sensor and occupancy sensor reporting back to the BMS. The terminal modulates supply airflow between a minimum (sized for the lowest credible occupancy and the AS 1668.2 / ASHRAE 62.1 minimum) and a maximum (sized for the design occupancy at design cooling load). On idle days the BMS holds every room at minimum airflow with the cooling coil unloaded — a 60–80 percent fan energy reduction relative to constant-volume operation.
Ductwork routing in demountable partition zones
Meeting rooms are routinely reconfigured by combining or subdividing rooms with demountable acoustic partitions. The duct routing has to support every credible configuration — typically a continuous supply main running above the ceiling along the long axis of the meeting room block, with VAV branches dropping into each potential room. When two rooms are combined the VAV terminals on the combined room slave together to a single zone controller.
Acoustic targets and duct lining
NC-30 is the default for general meeting rooms, NC-25 for premium rooms (board-level meetings, recorded sessions). The acoustic target drives the duct lining specification — internal mineral wool lining 25 mm thick on the supply main and the first 3 m of every branch, attenuators at every branch take-off, and double attenuators where the branch passes a plant room or AHU. Acoustic lining is designed in line with AS/NZS 4859.1 thermal-acoustic insulation.
Plenary auditorium HVAC
The plenary auditorium is the most demanding HVAC environment in any convention centre. The combination of 5,000+ seats at NC-25 acoustic target, dedicated audio-visual infrastructure, and assembly-occupancy life-safety requirement creates a unique design challenge.
Displacement ventilation under raked seating
The default strategy is displacement ventilation under the raked seating with a low-velocity supply plenum. Cool air enters through perforated grilles in the riser of each seating row at 0.1–0.2 m/s face velocity, pooling at occupant level. The natural convection plume from each occupant carries the warm air upward to a high-level return zone above the proscenium and at the rear of the auditorium. Total airflow is 30–40 percent lower than equivalent overhead-supply auditoriums, and the absence of overhead supply diffusers eliminates audible turbulence.
Sound-attenuated supply and return paths
Every supply and return main has at least one full-length attenuator between the AHU and the auditorium boundary. Where the supply main passes through a plant room, double attenuators are required. Duct walls in the auditorium ceiling void are lined with 50 mm mineral wool internal lining for break-in attenuation. The AHU itself is sized for low-pressure operation (typically 750 Pa external static at design airflow) to keep the fan noise contribution minimal.
Smoke management for assembly occupancy
The plenary is treated as a separate smoke compartment with dedicated smoke exhaust at the upper proscenium and pressurised supply to the adjacent stair lobbies. The smoke exhaust ductwork is fire-rated to FRL 60/60/60 per AS 1530.7, constructed in galvanised G90 steel with vermiculite fire wrap. The smoke control sequencing is tied to the assembly-occupancy life safety system and the BMS evacuation mode.
Catering kitchen HVAC
The catering kitchen is the second-most demanding HVAC environment in the convention centre. The combination of high-temperature exhaust, grease-laden air, and the assembly-occupancy life-safety implication of a kitchen fire spreading through the duct riser creates a tightly regulated specification.
Type I hood exhaust per NFPA 96
Solid-fuel grills, woks, fryers, ovens and broilers generate grease-laden vapour that has to be exhausted through Type I hoods over the cooking line. The hood draws at typically 1.5–2.5 m/s face velocity, with a UL 710 fire-rated hood baffle and continuous external slope to a grease reservoir. The exhaust ductwork is Schedule 10 carbon steel welded per NFPA 96 Section 7 — full penetration welds at every joint, leakage tested with light at every joint, continuous external slope at minimum 1 in 50 fall to the grease reservoir, and access doors at every change of direction for cleaning.
Type II vapour hood
Steam tables, dishwashers, ovens generating only vapour (no grease) and warming cabinets are exhausted through Type II hoods. The exhaust ductwork is 304L stainless or aluminised steel — easier to fabricate than Schedule 10 welded grease duct, but not approved for grease-laden air.
Replacement air at 60–70 percent of exhaust
The kitchen exhaust runs at typically 6–12 air changes per hour at design cooking load. Replacement air is supplied through dedicated MUA (makeup air) units at 60–70 percent of the exhaust volume — the kitchen runs slightly negative to stop grease vapour migrating to the dining floor or the adjacent exhibition hall. The MUA units are typically gas-fired direct-fired heaters in cold climates or evaporative cooled in dry hot climates, sized for the full design exhaust load.
Dishwasher exhaust and grease trap ventilation
Dishwasher exhaust is a separate Type II riser, typically 304L stainless to handle the high humidity. Grease trap ventilation is a small dedicated exhaust path direct to atmosphere to vent decomposition gases without recirculating to the kitchen.
Materials and construction
Convention centre HVAC ductwork uses five distinct material zones, each driven by the application and the regulatory framework.
Galvanised steel for general supply, return and exhaust
The default material is galvanised steel G90 (Z275 in metric) per AS 1397 or ASTM A653. Gauges range 1.0 mm (20 ga) for small branch ducts up to 1.6 mm (16 ga) for large supply mains. Construction follows SMACNA HVAC Duct Construction Standards Metal and Flexible 4th Edition, AS 4254.2 for rectangular duct in Australia, or DW/144 in the UK. Joints are TDF (Transverse Duct Flange) for rectangular up to 2 m girth, slip-and-drive for smaller sizes, and welded angle flange for very large or high-pressure mains.
Fabric duct for feature exhibition hall distribution
Fabric duct from Durkeesox, Prihoda or KE Fibertec is increasingly the default for visible exhibition hall distribution. Fabric type ranges from non-permeable polyester (high-velocity supply with fixed orifice nozzles) to permeable polyester (low-velocity displacement with dispersed surface flow). Suspension is from a continuous monorail along the length of the duct. Duct diameter ranges 300–1,500 mm depending on flow rate. Cleaning is by removal and laundering at typically 12-monthly intervals.
304L stainless for catering Type II and dishwasher exhaust
304L stainless is specified for Type II vapour exhaust over steam tables and dishwashers, and for any catering exhaust path subject to high humidity or chemical cleaning agents. Wall thickness 1.2 mm (18 ga) standard, joints TDF or welded depending on fire and smoke compartmentation requirements.
Schedule 10 carbon steel welded for grease duct
Schedule 10 carbon steel welded per NFPA 96 is the only acceptable material for Type I grease exhaust ductwork. Wall thickness nominal 3.4 mm (10 ga), full-penetration welds at every joint, continuous external slope at minimum 1 in 50 fall, access doors at every change of direction for cleaning. Welding is by qualified welders to AWS D1.1 or AS/NZS 1554.1.
Galvanised G90 with SMACNA Class 3 sealing for smoke management
Smoke management mains and stair pressurisation ductwork are constructed in galvanised G90 steel to SMACNA leakage Class 3 — sealed with elastomeric mastic at every joint, mandatory site leakage testing prior to insulation, and maximum allowable leakage 0.05 percent of design airflow at design pressure. Fire-rated ductwork on smoke spill paths uses a vermiculite or rockwool fire wrap to achieve FRL 60/60/60 per AS 1530.7 or 1-hour rating per UL 1978.
Acoustic considerations
Acoustic performance in a convention centre is zone-specific. The design team has to set NC targets by typology and then translate the targets into duct lining, attenuator selection and AHU specification.
- NC-25 — plenary auditorium and 5,000+ seat assembly hall. Full duct lining, attenuators on every supply and return branch, double attenuators where the branch passes a plant room, AHU sized for low-pressure operation.
- NC-30 — general meeting and conference rooms. Internal mineral wool lining 25 mm on the supply main and first 3 m of every branch, attenuators at every branch take-off.
- NC-35 — hotel-attached pre-function and ballroom. Inheriting host hotel acoustic standard, fabric duct or finished plasterboard ceilings concealing the ductwork.
- NC-40 — main exhibition hall. Less stringent because ambient activity from booths and crowd noise dominates. Standard SMACNA construction with attenuators only at AHU outlets.
- NC-45 — catering kitchen and back-of-house. Acoustic performance subordinated to grease, temperature and cleaning requirements.
- NC-50 — loading dock, freight elevators, plant rooms. No specific acoustic treatment, structural break-out attenuation through the building envelope is the dominant noise control.
Acoustic lining is designed to AS/NZS 4859.1 thermal-acoustic insulation, with mineral wool the default insulant. Antimicrobial-treated lining is used in catering-adjacent ductwork. Melamine foam lining is used in feature spaces where appearance and cleanability matter more than absolute acoustic absorption coefficient.
Event-day HVAC challenges
The day-to-day operation of a convention centre HVAC plant is structured around the event calendar. Each day has a different load profile and the BMS sequencing has to follow it.
Idle days
The hall has minimal occupancy — maintenance, cleaning, and a handful of staff. The BMS holds every space at minimum AS 1668.2 ventilation, supply temperature setpoint at upper limit, return temperature setpoint at lower limit (a 4–6 K dead band that minimises mechanical cooling and heating). Free cooling economisers run whenever outside air conditions allow. Total fan and chiller energy on an idle day is 10–20 percent of an event-day peak.
Setup and breakdown days
The hall fills with stand-builders, riggers, AV technicians and forklifts. Occupancy is moderate — typically 200–500 people per hall — but air movement is high (forklift exhaust, dust from set-build, chemical fumes from temporary signage). The BMS lifts the ventilation rate to typically 50–70 percent of event-day peak with full outside air in temperate weather, demand-controlled ventilation tied to CO2 sensors. The smoke management system is in standby-armed mode but not activated.
Event-day peak
The hall is packed with up to 50,000 visitors generating 5 MW of sensible heat plus the equipment and lighting load from the booths. The BMS runs full design airflow with maximum design cooling capacity, demand-controlled ventilation tied to turnstile counts and CO2 sensors. The smoke management system is fully armed with single-button-activation override at the fire panel. Acoustic targets are met through the duct lining and attenuator system. This is the design condition for the entire HVAC plant.
Pre-event purge and post-event recovery
The 2 hours before doors open are used for pre-event purge — full outside air at maximum airflow to clear any residual contaminants from setup. The 2 hours after doors close are used for post-event recovery — full outside air to clear the residual occupant heat and CO2 before the breakdown crew arrives. Pre-purge and post-recovery are critical for IAQ on a multi-day event series.
Retractable and multi-function venues
A growing number of convention centres are also multi-function venues — Sydney Showground, Melbourne Olympic Park, Brisbane Live Arena, the LVCC West Hall in concert mode. Multi-function venues run dual-mode HVAC sequencing.
Sport mode
Lower humidity setpoint (40–50 percent RH) for ice events and fast-pull-down for tip-off. Acoustic performance subordinated to fast-response capability. The smoke management system is armed but the load is lower because combustible loading is minimal.
Exhibition mode
Higher fresh air rate to handle vendor stand off-gassing and elevated crowd density. Longer pre-event purge to clear any residual sport-event chemicals. Acoustic dampers on attenuated paths held open. Smoke management system armed with full design fire heat release rate.
Concert and entertainment mode
Acoustic dampers closed on attenuated paths to maximise low-frequency absorption. Audio-visual equipment heat load uplifts cooling capacity. Restricted-occupancy zones (mosh pit, standing-only) require local CO2 sensors and occupancy override.
Hotel-attached convention venues
Most modern convention centres sit alongside or above a host hotel — ICC Sydney's adjoining Sofitel Sydney Darling Harbour, MCEC's Pan Pacific Melbourne, BCEC's Rydges South Bank, the Hilton at Adelaide Convention Centre, Westgate Las Vegas Resort at LVCC, the Hilton Riyadh at RICEC, the Marina Bay Sands at Singapore Expo. The HVAC integration between the convention centre and the hotel is one of the highest-stakes interface design challenges in the project.
Dedicated AHU per ballroom
Each ballroom or pre-function space typically has a dedicated AHU on the convention centre side, with a sound-attenuated supply and return path through to the hotel side. The hotel inherits the AHU plant for the convention spaces but typically retains its own dedicated AHU plant for guest-room HVAC.
BMS sequencing on guest-arrival days
On guest-arrival days the BMS prioritises hotel-side spaces — pre-function arcade, ballroom, lobby, bar — over convention-side spaces. On event days the priority reverses. The BMS has a daily schedule that switches the priority based on the event calendar.
Fire and smoke compartmentation
The fire-resistance compartmentation between the convention centre and the hotel is typically 2-hour rated, with combination fire-and-smoke dampers at every duct penetration. The damper schedule is one of the most heavily inspected elements of the project handover.
Construction phasing
Convention centre HVAC ductwork is delivered across multiple phases that align with the architectural and structural milestones.
Shell-and-core (months 4–8)
Riser ductwork from plant rooms down to floor levels, plant-room mains, AHU ductwork connections, smoke management exhaust risers and stair pressurisation supply risers. All shell-and-core duct is in place before the curtain wall closes. SMACNA Class 3 leakage testing is mandatory on every smoke management and stair pressurisation duct prior to insulation.
Hall fitout (months 6–11)
Large-volume hall distribution, perimeter under-glazing slot diffusers, jet diffusers, fabric duct distribution, return ductwork. AHU farms are commissioned during this phase ahead of the meeting room and auditorium fitout.
Meeting room and auditorium fitout (months 9–12)
VAV terminal boxes, branch ductwork, ceiling diffusers, attenuators on auditorium supply and return paths, displacement ventilation under-seat plenum installation, demountable partition zone coordination.
Catering kitchen and BOH (months 8–12)
Sequenced earlier to allow welding inspections without congestion. Schedule 10 grease duct fabricated and welded, hood installation, grease reservoir piping, MUA unit commissioning.
Commissioning and BMS integration (months 12–14)
Full HVAC plant commissioning with seasonal testing, BMS event calendar programming, smoke management commissioning with fire panel integration, NABERS or LEED commissioning verification, operator training.
Energy efficiency and sustainability targets
Modern convention centres are increasingly chasing high sustainability ratings. The HVAC plant is the largest single energy consumer in the building and the primary lever for rating points.
NABERS Energy for Australian venues
NABERS Energy is the dominant Australian rating tool for commercial buildings. Convention centres typically target 4.5 stars or better, with leading venues like ICC Sydney pushing 5.5 stars through a combination of high-efficiency chillers, demand-controlled ventilation, free cooling economisers and tight-leakage duct construction. The NABERS rating period is 12 months of operation, so the rating is operational not theoretical — the HVAC plant has to actually deliver the energy savings, not just be designed for them.
NABERS Indoor Environment for IAQ
NABERS Indoor Environment rates the actual indoor air quality, thermal comfort, lighting and acoustic performance of the building during occupied hours. Convention centres typically target 4 stars or better, with the HVAC ductwork acoustic and ventilation rate compliance being the dominant lever.
Green Star Design and As Built
The Green Building Council of Australia's Green Star Design and As Built v1.3 is the dominant Australian green building rating tool for new build. Convention centres typically target Green Star 5 stars Australian Excellence or 6 stars World Leadership. HVAC credits include energy modelling, peak electricity demand reduction, refrigerant management, IAQ ventilation rate uplift, and acoustic performance.
LEED v4.1 BD+C for global venues
LEED v4.1 Building Design and Construction is the dominant global green building rating tool. Convention centres typically target LEED Gold or Platinum, with HVAC credits across enhanced commissioning, fundamental and enhanced refrigerant management, optimised energy performance, IEQ minimum ventilation rate and ventilation rate uplift, low-emitting materials, and indoor air quality assessment.
BREEAM Excellent and WELL Building Standard
BREEAM is the dominant European green building rating tool, with convention centres like ExCeL London achieving BREEAM Excellent. WELL Building Standard rates building performance against occupant health and wellbeing — IAQ, thermal comfort, acoustic performance, lighting. Convention centres are increasingly targeting WELL Core certification alongside their primary green building rating.
Tight-leakage duct as the largest energy lever
The single largest energy contribution from the duct package is leakage performance. SMACNA leakage Class 3 construction with mandatory site leakage testing reduces leakage to below 0.05 percent of design airflow at design pressure. A 10 percent leakage reduction translates to typically 8–12 percent reduction in annual fan energy. For a convention centre with a 5 MW peak fan load, that is a 400–600 kW saving — comparable to the energy contribution of the chiller plant efficiency upgrade.
SBKJ machinery for convention centre projects
SBKJ does not fabricate the duct itself — that is the role of the local mechanical contractor on the project. SBKJ supplies the machinery that the mechanical contractor uses to fabricate the galvanised rectangular and round content of the duct package. Typical convention centre projects bundle the HVAC duct fabrication into one or several mechanical packages awarded to local contractors, and most of those contractors run SBKJ machinery for the bulk fabrication.
SBAL-V auto duct line for high-volume galvanised rectangular
The SBAL-V auto duct line is the workhorse for high-volume galvanised rectangular fabrication on a convention centre project. The line takes coil stock and outputs finished rectangular duct sections complete with TDF flanges, ready for site assembly. Single-shift output is 800–1,200 m² per shift depending on duct size mix. For a typical convention centre project requiring 30,000–80,000 m² of rectangular duct, the SBAL-V handles the bulk supply, return and exhaust mains.
SBTF spiral tubeformer for round duct
The SBTF spiral tubeformer is the standard machine for round spiral duct used in atrium and corridor applications. Spiral duct is increasingly preferred over rectangular for round-cross-section runs because of its higher pressure rating, lower leakage, and visual appearance when exposed. The SBTF outputs spiral duct in diameters from 80 mm to 1,500 mm at production rates up to 30 m/minute.
TDF flange former for tight-leakage smoke management
The TDF (Transverse Duct Flange) former is essential for SMACNA Class 3 tight-leakage smoke management ductwork. The TDF system creates an integral flange at every duct end, sealed with elastomeric mastic at site assembly, achieving leakage below 0.05 percent of design airflow at design pressure. Most SBKJ auto duct lines integrate a TDF flange former as standard.
Fabric duct as alternative for some applications
Fabric duct is procured separately from manufacturers like Durkeesox, Prihoda and KE Fibertec — SBKJ does not fabricate fabric duct. The fabric duct supplier's role is independent of the rigid duct fabricator. On a typical convention centre project, fabric duct accounts for 15–30 percent of the visible exhibition hall distribution layer, with rigid galvanised handling everything else.
Procurement model
Convention centre HVAC duct procurement follows a standard pattern across Australian and international projects.
Main contractor awards mechanical packages
The head contractor — Lendlease, Multiplex, Built, John Holland, Mirvac in Australia; Skanska, Bouygues, Vinci, Bechtel, Turner globally — awards mechanical packages to specialist mechanical contractors. Typical convention centre packages split into shell-and-core mechanical, exhibition hall fitout, plenary auditorium, catering kitchen, hotel-attached spaces, retail. Each package is typically 5–25 million USD depending on scope.
Mechanical contractor self-fabricates or sub-contracts duct
The mechanical contractor either self-fabricates the duct in their own shop using SBKJ machinery, or sub-contracts the duct fabrication to a specialist sheet-metal contractor who runs SBKJ machinery on their behalf. The choice is driven by the contractor's existing fabrication capacity and the project schedule.
Site fabrication for complex projects
Very large or complex convention centre projects sometimes set up an on-site fabrication shop with SBKJ machinery installed in a temporary site building. This eliminates the trucking lead time between fabrication shop and site, allows daily shop-to-site iteration on complex installations, and supports last-minute design changes during fitout. Site fabrication shops are increasingly common on the largest projects — Las Vegas Convention Center West Hall and ICC Sydney both used site fabrication shops during peak construction.
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FAQ
What is the typical lead time for HVAC ductwork on a convention centre project?
Convention centre and exhibition hall HVAC duct fabrication typically runs 8–14 months from main contractor award to handover. Shell-and-core duct risers and AHU plant-room mains are usually complete in months 4–8; large-volume hall distribution and fabric duct comes in months 6–11; meeting room VAV branches, plenary auditorium acoustic ductwork and catering kitchen exhaust complete by month 12; commissioning and BMS integration in months 12–14. Tight-leakage smoke management mains have a longer FAT cycle and should be released for fabrication 4 weeks before general supply ductwork.
What standards apply to fire-rated ductwork in convention centres?
Australian convention centres reference AS 1668.1 fire and smoke control, AS 1668.4 smoke control in atria and large-volume spaces, AS 1530.7 fire-resistance test for ductwork, and AS/NZS 1668.2 mechanical ventilation. International venues reference NFPA 92 standard for smoke control systems, NFPA 90A standard for ventilation, NFPA 101 Life Safety Code Chapter 13 assembly occupancy, IBC Chapter 10 means of egress, and UL 555/555S fire and smoke damper standards. Grease ducts in catering kitchens follow NFPA 96 standard for ventilation control of commercial cooking operations.
How is atrium smoke management designed for a convention centre exhibition hall?
Under NFPA 92 atrium smoke management, the smoke layer interface must be maintained at least 2.5 m (8 ft) above the highest occupant walking surface. Mechanical exhaust fans extract at the ceiling — typical design fire heat release for an exhibition hall ranges 5–15 MW depending on combustible loading from booths and stored exhibits. Makeup air enters at low level either through perimeter dampered openings or via dedicated supply ductwork at velocities below 1.0 m/s (200 fpm) to avoid disrupting the smoke plume. AS 1668.4 in Australia uses the same plume calculation methodology with conversion factors for local terminology.
When is fabric duct preferred over traditional rectangular galvanised duct in exhibition halls?
Fabric duct is preferred where the visual appearance of exposed traditional duct is unacceptable in a feature space, where air dispersion needs to be tuned along the length of the run with porosity changes, where condensation risk on cold supply duct is a concern, where the soft material reduces NC penalty by 2–3 points, or where demountability for venue reconfiguration is needed. Traditional galvanised rectangular remains the default for shell-and-core risers, plant-room mains, kitchen exhaust and any application requiring a fire rating — fabric does not carry a fire-resistance rating.
What materials are specified for convention centre HVAC ductwork?
Five material zones apply: galvanised steel G90 per AS 1397 or ASTM A653 for general supply, return and exhaust at gauges 1.0–1.6 mm; Schedule 10 carbon steel welded per NFPA 96 for catering Type I grease exhaust; 304L stainless or aluminised steel for catering Type II vapour exhaust; galvanised G90 with sealed Class A construction per SMACNA leakage Class 3 for tight-leakage smoke management mains; and fabric duct from Durkeesox, Prihoda or KE Fibertec for feature exhibition hall distribution.
What acoustic targets apply to convention centre HVAC ductwork?
Plenary auditoriums and 5,000+ seat assembly halls target NC-25 with full acoustic lining, attenuators on every supply and return branch, and low-velocity displacement ventilation under raked seating. General meeting and conference rooms target NC-30. Hotel-attached pre-function and ballroom space targets NC-35. Main exhibition halls target NC-40. Catering kitchen exhaust targets NC-45 or higher. Acoustic lining is duct-mounted internal lining with mineral wool or melamine foam, lined in line with AS/NZS 4859.1.
What displacement ventilation strategy is used for large exhibition halls?
Modern exhibition halls use stratified displacement ventilation rather than fully mixed overhead supply. Cool supply air is delivered at low level around the perimeter at 0.2–0.4 m/s face velocity, pooling at occupant level and rising by natural convection. The return is taken at high level. This reduces total airflow by 20–40 percent versus mixed ventilation, improves thermal comfort at the occupant zone, and creates a natural smoke-clearing layer above 2.5 m that integrates with NFPA 92 smoke management.
How does a convention centre support a NABERS Energy or LEED rating?
NABERS Energy ratings for Australian convention centres are driven by HVAC plant load profile against the event calendar — economiser cycles for free cooling on shoulder-season setup days, demand-controlled ventilation tied to CO2 sensors and occupancy headcount, BMS sequencing that drops idle days to minimum AS 1668.2 ventilation rates, and overnight free-cooling pre-purge before peak event days. LEED v4.1 for global venues credits enhanced commissioning, low-leakage SMACNA Class 3 duct construction, ASHRAE 62.1 minimum ventilation rates plus 30 percent uplift for IEQ credit, and refrigerant management. Tight-leakage ductwork is the single largest energy lever — a 10 percent leakage reduction can save 8–12 percent of annual fan energy.
