Sydney Opera House + Arts Centre Melbourne + QPAC + Performing Arts HVAC Duct Guide

Author: SBKJ Group engineering desk · Box Hill North VIC · ARBS 2026 exhibitor · Published: 27 May 2026

Sydney Opera House HVAC duct

The Sydney Opera House at Bennelong Point is the most visible single brief any Australian HVAC duct fabricator will ever receive. Inscribed on the UNESCO World Heritage List in 2007 and protected federally under the Environment Protection and Biodiversity Conservation Act, the building completed by Jorn Utzon's team in 1973 contains a stack of performance spaces with radically different acoustic, ventilation and conservation requirements: the Concert Hall seating 2,679 (home to the Sydney Symphony Orchestra, the Australian Chamber Orchestra, the Australian World Orchestra and the Sydney Conservatorium's graduating recitals), the Joan Sutherland Theatre seating 1,507 (Opera Australia and The Australian Ballet for the Sydney season), the Drama Theatre seating 544 (Sydney Theatre Company and visiting companies), the Playhouse seating 398, the Studio seating 280, and the recently completed Utzon Room seating 213 for chamber and recital. The forecourt and Northern Foyer move 5.8 million visitors a year - a figure no other Australian venue approaches - and the Bennelong restaurant plus a network of bars and front-of-house facilities push the total occupant load above 10,000 during the busiest summer festival evenings.

Behind the famous tile-clad roof shells the ductwork is anything but romantic. Original AS 1668.2 ventilation was designed in the late 1960s on imperial pressure-velocity tables and routed through the structural rib intervals of the in-situ concrete shells. The 2017-2022 Concert Hall renewal, led by ARM Architecture with Arup acoustics and Marshall Day on room acoustics, replaced essentially every supply and return diffuser, every linear slot and every acoustically lined branch back to the original under-stage plant rooms. SBKJ-style high-leakage-class spiral round duct made on the SBFB-1500 line, in diameters from 80 mm to 250 mm, is the only practical solution for threading new air paths through the residual concrete cavities without further penetration of the heritage shells. Rectangular ducts manufactured on the SBAL-V automatic duct line in 0.8 to 1.2 mm hot-dip galvanised sheet to AS 1397 Z275, with continuous TDF flanges from the SBTF-1500/1602/2020 line, deliver the bulk supplies in plant-room and back-of-house corridors where joinery is concealed behind acoustic ceiling panels and removable timber flute battens.

The Sydney Opera House Conservation Management Plan, written by Alan Croker and successive teams, codifies the Burra Charter 2013 principles for this site: minimum intervention, reversibility, and absolute respect for Utzon's design intent. Every new duct route is sleeved through existing service risers; no new penetration is made through the board-formed concrete sub-structure or the tile lid; and every diffuser face is bespoke-tooled to match the Petersen tile geometry or the original Ronchamp-influenced timber panelling of the Concert Hall. SBKJ supply the spiral and rectangular substrates to Sydney-based installers (Norman Disney Young, Aurecon, Cundall and WSP Australia are the most frequent consulting engineers on the site) and our SBLR-600 fibre laser cuts perforated diffuser faces from 1.5 mm 304 stainless to the consultant's exact CAD geometry.

Acoustically the Concert Hall now runs to AS/NZS 2107 NC 25 with RT 60 sitting between 1.95 and 2.05 seconds at mid-frequencies fully occupied - a transformative result from the pre-renewal envelope where audience absorption pulled the RT down below 1.7 seconds and HVAC self-noise broke the NR 25 ceiling at the front stalls. The ventilation plant supplies a Sydney Symphony Orchestra's 90-piece scoring of Mahler at 18 deg C dry bulb, gently rising to 22 deg C through interval as the audience releases sensible heat, with terminal supply velocity at the patron face under 0.18 m/s on the long-throw linear slots designed by Marshall Day for displacement ventilation up through the seat plinths. CO2 sensors at the return air ceiling grilles modulate the outside air fraction; with 2,679 patrons at 8 L/s/person under ASHRAE 62.1 the design ventilation is 21,432 L/s of outside air, peaking at 2,400-2,800 ppm CO2 during the slow movement of a Bruckner symphony and falling rapidly through the 20-minute interval.

Arts Centre Melbourne Hamer Hall

South of the Yarra at 100 St Kilda Road, Arts Centre Melbourne is the federal-state-private partnership that anchors the Southbank arts precinct. Roy Grounds and John Truscott's original 1984 design - the spire-topped Theatres Building and the separate Hamer Hall - was substantially renewed by Ashton Raggatt McDougall and ARM Architecture in 2012 to bring the Melbourne Symphony Orchestra's principal hall up to international touring standard. Hamer Hall seats 2,464 patrons across stalls, circle and gallery; the State Theatre seats 2,085 with a covered Bayreuth-style orchestra pit serving Opera Australia and The Australian Ballet for the Melbourne season; the Playhouse seats 884 for Melbourne Theatre Company; the Fairfax Studio seats 350 for chamber and experimental work; and the outdoor Sidney Myer Music Bowl seats 12,000 for the annual summer concert series.

The Hamer Hall renewal stripped the entire HVAC distribution back to the concrete shell of John Truscott's original plenum bowls. SBKJ-pattern rectangular supply duct from the SBAL-V auto duct line replaced the 1980s circular-spiral original (which had failed leakage testing in seven discrete locations and was contributing 6-7 dB(A) of self-noise to the seated audience). Hamer Hall now runs at NC 25 design under AS/NZS 2107 with mid-frequency RT 60 of 1.95 seconds occupied, very close to the Concert Hall in Sydney - a deliberate alignment by Marshall Day Acoustics, who consulted on both venues. Displacement ventilation supplies air at 18-19 deg C through the seat plinths in the stalls and through long-throw chilled-beam grilles in the circle, with terminal velocity under 0.2 m/s on the patron face and CO2 modulation against the 5,000 ppm WES TWA pulling outside air to 8 L/s/person under ASHRAE 62.1.

The State Theatre poses a different problem. Opera Australia's repertoire - from Verdi's Aida to Wagner's Ring Cycle - relies on a covered orchestra pit and the pit's microclimate is one of the most challenging in any Australian venue. Players, instruments and electronic library lights generate sensible heat at perhaps 350 W per player; humidity must sit at 40-50%RH for woodwinds, brass and strings (particularly the violin section's Gagliano, Guadagnini and Stradivari-style instruments on loan from the orchestra's foundation); and the temperature has to stay between 19 and 22 deg C across a three-hour Verdi opera. SBKJ supply dedicated spiral round duct on the SBFB-1500 line in 100-200 mm diameter for the pit displacement supply, with low-throw floor diffusers selected by Marshall Day. Crucially the pit duct is acoustically isolated from the auditorium duct via a labyrinth attenuator so the supply air can move without singing through to the singers and patrons above.

The Sidney Myer Music Bowl is the wildcard. A canopied outdoor venue seating 12,000, it carries the MSO's free summer concerts and a network of contemporary acts. There is no climate-controlled envelope to maintain, but the back-of-house dressing rooms, sound and lighting control booths, and broadcast trucks all need climate stability for the same musicians performing internal concerts. SBKJ-supplied modular AHU connections in 316L stainless from the SBAL-V line provide the bridging ducts between roof-mounted plant and the under-stage cable trough where ABC Radio National often runs live-to-air broadcasts.

QPAC Brisbane Concert Hall

At the Brisbane Cultural Centre on the south bank of the Brisbane River, the Queensland Performing Arts Centre (QPAC) houses four venues: the Concert Hall seating 1,800 (Queensland Symphony Orchestra, Opera Queensland chamber work, and the Australian Brandenburg Orchestra on Brisbane tour); the Lyric Theatre seating 2,000 (Queensland Ballet, Opera Queensland mainstage and touring musicals); the Playhouse seating 850 (Queensland Theatre and Bell Shakespeare on Brisbane season); and the Cremorne Theatre seating 312 (La Boite Theatre, experimental and contemporary indigenous work). The complex sits within a precinct that also includes the Queensland Art Gallery, GOMA, Queensland Museum and the State Library of Queensland - all of which share heritage and conservation envelope requirements through coordinated plant rooms.

QPAC's tropical-subtropical setting on the Brisbane River sets the HVAC brief apart from Sydney and Melbourne. Summer wet-bulb temperatures regularly exceed 24 deg C; the cooling load is dominated by dehumidification rather than sensible cooling; and the ventilation system must handle both monsoonal moisture intrusion and the dry winter Antarctic southerly. Chilled-water supply from the Cultural Centre's central plant feeds independent AHUs for each venue, each with a separate dehumidification pre-cool coil and a sensible reheat to land the supply at 18 deg C dry bulb 55-60% RH for the Concert Hall, 22-24 deg C 50%RH for the Lyric, and 21-22 deg C for the Playhouse and Cremorne. SBKJ-pattern rectangular duct from the SBAL-V line in 1.0 mm hot-dip galvanised supplies the QSO's Concert Hall stage at NC 25 acoustic, with RT 60 sitting at 1.85 seconds mid-frequency occupied - a slightly drier acoustic than Sydney or Melbourne to suit the smaller hall volume and QSO's chamber-leaning programming.

The Lyric Theatre at QPAC hosts long-running musical theatre touring productions: Hamilton, Wicked, Phantom of the Opera, Mary Poppins, School of Rock, and seasonal opera and ballet from Queensland Ballet and Opera Queensland. The covered pit follows the same Bayreuth-style microclimate brief as Sydney and Melbourne; SBKJ supply the dedicated pit duct on SBFB-1500 spiral. The fly tower and stage machinery zone is a different beast - cyclorama lighting and motorised flybars generate 30-50 kW of stage-electrical heat, and the proscenium has to dump that load without imposing audible airflow on the orchestra below. SBKJ rectangular dump-air duct in 1.2 mm galvanised on the SBAL-V handles the fly tower exhaust at 8-10 m/s face velocity, attenuated to NR 30 at the proscenium and breaking out to atmosphere through the Cultural Centre's coordinated stack.

Adelaide Festival Centre + Perth Concert Hall + His Majesty's Theatre

The Adelaide Festival Centre, completed in 1973 by Hassell & Partners and renewed across 2014-2020 under a state government precinct project, contains the Festival Theatre seating 2,000 (Adelaide Symphony Orchestra, State Opera SA, Australian Dance Theatre principal venue), the Dunstan Playhouse seating 600 (State Theatre Company SA), and the Space Theatre - a flexible black-box used for festival programming, chamber music and contemporary dance. The Adelaide Festival itself - one of the world's significant arts festivals - turns the building over to a continuous run of opera, chamber, theatre and dance for three weeks every March, with the back-of-house and rehearsal spaces booked solid 24 hours a day.

The Festival Theatre acoustic brief sits between a concert hall and an opera house: ASO use it for their subscription symphony series; State Opera SA stage their mainstage productions in the same room; and the Australian Ballet visits with the Adelaide season. The compromise RT 60 is around 1.8 seconds occupied at mid frequency - slightly drier than a pure concert hall, slightly more reverberant than a pure opera house. SBKJ rectangular supply duct on the SBAL-V line at 1.0 mm galvanised carries the displacement supply at NC 25, with the orchestra pit on a separate spiral SBFB-1500 circuit at NC 20.

Perth Concert Hall on St George's Terrace, designed by Howlett & Bailey in 1973 and home to the West Australian Symphony Orchestra (WASO), seats 1,729 in a single shoebox geometry that delivers RT 60 of 2.0-2.1 seconds at mid frequency fully occupied - among the longest in any Australian hall and prized by visiting conductors for late-Romantic and contemporary Australian programming. The 2020-2024 renewal coordinated by JCY Architects and Marshall Day Acoustics replaced the original 1973 air supply with a low-velocity displacement system supplied by SBKJ-pattern rectangular duct on the SBAL-V line and spiral on the SBFB-1500. The new system holds NC 25 absolute design - a notable improvement on the pre-renewal envelope which sat at NR 30 due to plant noise at the proscenium dumps.

Just up St George's Terrace, His Majesty's Theatre - built in 1904 and seating 1,200 - is the home of the West Australian Opera, West Australian Ballet, and Black Swan State Theatre Company. The 1904 fabric is heritage-listed at state level under the WA Heritage Act and falls squarely under Burra Charter conservation principles. The 2022-2024 envelope renewal made no new penetrations through the original Federation-period brick or the Italianate plaster ceiling; SBKJ-pattern spiral round duct on the SBFB-1500 line in 100-200 mm diameter was threaded through disused gas-flue voids and the original 1904 dumb-waiter shafts to reach the modern auditorium plenum. Diffusers are bespoke perforated brass to match the original gilded ornament. The full-cycle airflow runs at NC 28 - a hair above the pure concert-hall criterion but exceptional for a 1904 heritage envelope.

Crown Theatre Perth and the Riverside Theatre at Crown Casino round out the West Australian variety circuit. They sit in the commercial entertainment band rather than the symphonic-classical band; NC 30-35 acoustic, RT 60 of 1.4-1.6 seconds, and a focus on amplified-music tour productions rather than acoustic symphony. SBKJ supply standard 0.8-1.0 mm galvanised duct on the SBAL-V line with bog-standard TDF flange on the SBTF-1500/1602/2020.

Acoustic NC 25 RT 60 1.5-2.0 sec concert hall

Across every venue catalogued above, the binding constraint on HVAC ductwork is AS/NZS 2107:2016 - the Australian/New Zealand Standard for the design of indoor acoustic environments. AS/NZS 2107 defines noise criterion (NC) curves, equivalent NR rating curves, and the satisfactory range of dB(A) for each space type, and is the document every acoustic consultant invokes when sizing duct attenuators and selecting diffuser self-noise. For performing arts venues the binding criteria fall in a tight band:

NC 25 in a Concert Hall is a savage criterion. Translated to plant equipment, it sets self-noise of every diffuser, every attenuator and every duct fitting at NR 15-20 - effectively below the threshold of audibility from the seated patron. The duct face velocity must sit between 2.5 and 3.5 m/s in the main runs to avoid Strouhal-driven flow noise; static pressure across the AHU system must keep duct radiated noise below the auditorium NR 15 break-in target; and every flexible connection, every transition and every branch take-off must be acoustically detailed by the consultant.

SBKJ's response to this brief is multi-layered. First, every rectangular duct above 600 mm wide is fabricated on the SBAL-V auto duct line with continuous Pittsburgh-locked seams that we pressure-test to AS 4254 leakage class B before despatch. Second, every TDF flange from the SBTF-1500/1602/2020 line carries a continuous elastomeric gasket from the corner-bayonet to the centre, holding leakage at 0.3 L/s/m^2 at 250 Pa - well inside AS 4254 class B. Third, every spiral run from the SBFB-1500 line is double-skin acoustic where it approaches within 8 m of the auditorium envelope, with a 50 mm acoustic glass-fibre lining (non-shedding, formaldehyde-free) and a perforated 0.8 mm galvanised inner skin to prevent erosion under flow.

The RT 60 target of 1.8-2.2 seconds at mid frequency (500 Hz) is the second leg of the acoustic brief. The duct system cannot itself contribute much absorption - any internally lined duct that reaches the auditorium envelope risks pulling RT down below the target. Marshall Day, Arup and Cermak Peterka Petersen typically detail the auditorium-side duct break as a non-absorptive 'hard duct' for the last 2-3 m of run, with the absorbent lining held back behind the cross-talk attenuator. SBKJ honour this by manufacturing a dedicated 'hard duct' batch on the SBAL-V at 1.2 mm galvanised with no internal lining at all, hand-finished and tagged for the auditorium-side termination only.

Burra Charter heritage concealed routing

The Burra Charter 2013 - issued by Australia ICOMOS and adopted nationally as 'The Australia ICOMOS Charter for Places of Cultural Significance' - sets the conservation principles that govern every intervention in a heritage-listed performing arts venue. The Charter's core principles are minimum change, reversibility, and respect for cultural significance. For HVAC fabricators these translate into hard duct-routing constraints: no new visible penetrations through the heritage envelope; no rigid fixings into original fabric where reversible fixings will do; concealed plenums sized to fit within disused chimney flues, lath-and-plaster cavities, dumb-waiter shafts, and ceiling voids above the heritage plaster; and a written Conservation Management Plan signed off by the relevant state heritage authority before any work commences.

SBKJ supply spiral round duct on the SBFB-1500 small-diameter line specifically to meet this brief. The line forms continuous helical-seam spiral from 80 mm to 1,500 mm diameter, with bead-rolled female ends for slip-coupling. Diameters of 80, 100, 125, 150, 180 and 200 mm cover the practical heritage range; these slide into 19th-century brick chimney flues without modification, into dumb-waiter shafts without fasteners, and into lath-and-plaster ceiling voids by hand from below through a 250 mm access plate set into a sacrificial section of plaster. The spiral's bead-roll female end accepts a slip coupling sealed with elastomeric gasket; no screws penetrate the heritage fabric.

The Princess Theatre Melbourne, opened in 1854 by John Black and operated under the Marriner Group, demonstrates the SBKJ approach. The 1854 fabric is Victorian state heritage; the 1922 William Pitt renewal added a Spanish Baroque foyer that is itself state-heritage; and the building has been continuously operated as a commercial musical theatre venue for 172 years (Phantom of the Opera, Wicked, Mary Poppins, and the long-running Hamilton season have all played the Princess). The 2018-2021 envelope renewal threaded SBKJ-pattern 100-200 mm spiral through the original 1854 gas-light chimney flues - now disused but in original brickwork - to deliver displacement air to the stalls without any new penetration through the William Pitt plasterwork. Bespoke diffuser faces in cast brass were tooled on the SBLR-600 laser to match the egg-and-dart cornice profile.

The Capitol Theatre Sydney, opened in 1916 and substantially restored in 1995, shows the same pattern at a larger scale. The 2,000-seat Spanish-Baroque interior - one of John Eberson's atmospheric theatres - is state-heritage protected. SBKJ-pattern spiral round duct in 125-200 mm diameter threads through the original 1916 ventilation tower (now a quasi-disused service riser) to deliver air to the gallery and dress circle without any visible penetration. Marriner Group's sister venues - the Regent Theatre Melbourne (1929), Comedy Theatre Melbourne (1928), Athenaeum Theatre Melbourne (1886) - all follow the same heritage-concealed pattern.

His Majesty's Theatre Perth, opened in 1904 and home to West Australian Opera and West Australian Ballet, sits under the WA Heritage Act and is one of the most heavily protected venues in the country. The 2022-2024 envelope renewal used SBKJ-pattern 80-150 mm spiral threaded through the original Federation-era gas flues; no new penetration through the original brick or plaster. Bespoke perforated gilded brass diffusers, laser-cut on the SBLR-600, match the original Italianate ornament so closely that the Trust's heritage architects sign-off includes a photograph captioned 'reversible intervention - no visible change'.

Theatre Royal Sydney was a special case. The original 1827 building was demolished; the 1875 second building was demolished; the third Theatre Royal closed in 2016 and the fourth - opened December 2021 in the King Street MLC Centre redevelopment - is a new build inside a heritage-protected commercial envelope. SBKJ-pattern rectangular duct on the SBAL-V line and spiral on the SBFB-1500 service this venue conventionally; the heritage protection sits on the office tower fabric, not the auditorium itself.

Carriageworks at Eveleigh in Sydney is an adaptive-reuse case. The original Eveleigh Railway Workshops (1880-1988) are state-heritage protected; since 2007 the workshops have hosted the Sydney Festival, contemporary visual art, indigenous performance through Bangarra Dance Theatre's residency, and experimental theatre. The HVAC routing exploits the original overhead cranes, locomotive inspection pits, and travelling-crane gantries as service zones - SBKJ-pattern spiral round duct in 200-400 mm diameter runs concealed within the gantry beams on rubber isolators to avoid drumming. The heritage fabric (cast-iron columns, wrought-iron trusses, masonry walls) is untouched.

Symphony Orchestra MSO SSO QSO WASO TSO ASO ABO

Australia has six state symphony orchestras and several national-touring ensembles, each with its principal venue and a distinct HVAC brief. The Sydney Symphony Orchestra (SSO) is resident at the Sydney Opera House Concert Hall. The Melbourne Symphony Orchestra (MSO) is resident at Hamer Hall. The Queensland Symphony Orchestra (QSO) is resident at QPAC Concert Hall. The West Australian Symphony Orchestra (WASO) is resident at Perth Concert Hall. The Adelaide Symphony Orchestra (ASO) is resident at the Festival Theatre. The Tasmanian Symphony Orchestra (TSO) is resident at the Federation Concert Hall in Hobart and the Princess Theatre Launceston. The Australian Chamber Orchestra (ACO) is mobile, touring the City Recital Hall Sydney, Melbourne Recital Centre, QPAC, AFC and PCH on a rotating subscription series. The Australian World Orchestra (AWO) convenes annually for the Sydney-Melbourne joint season. The Australian Brandenburg Orchestra (ABO) plays the City Recital Hall Sydney and the Melbourne Recital Centre's Elisabeth Murdoch Hall on its baroque period-instrument series.

Symphony orchestras impose three peculiar HVAC demands beyond the AS/NZS 2107 NC 25 / RT 60 1.8-2.2 seconds acoustic brief. First, instrument microclimate: a violin section's 16 instruments and 16 bows must sit at 19-22 deg C and 40-50%RH to keep the gut and steel-core strings stable, the wood unwarped, and the bow hair tight. Second, stage thermal load: a 90-piece symphony radiates 200-350 W per player at the seated position, peaking at 30-32 kW for a full Mahler or Bruckner reading. Third, low-frequency stage rumble: the SSO's contrabasses, MSO's bass drums and QSO's bass tubas reach down to 30 Hz and the HVAC must not contribute any 31.5 Hz octave-band rumble through ductwork drumming.

SBKJ-pattern rectangular and spiral duct, manufactured on the SBAL-V and SBFB-1500 lines, addresses all three. Stage supply ducts terminate in low-throw chilled-beam grilles at 0.15 m/s face velocity to keep instrument-side air motion below the player's perception. Duct walls are 1.0-1.2 mm hot-dip galvanised on stage supplies to push the natural resonant frequency above 100 Hz - well clear of the contrabass and bass drum fundamentals. And the supply temperature is held at 20-22 deg C with rate-of-change limited to 0.5 deg C per hour to keep the orchestra's instruments stable across rehearsal and concert.

The Tasmanian Symphony Orchestra in Hobart is the smallest of the state orchestras and its principal venue, the Federation Concert Hall (a converted timber-framed hall on the Hobart waterfront), is a heritage-sensitive site. SBKJ-pattern 80-150 mm spiral on the SBFB-1500 line provides the displacement supply through the original 1950s service voids; rectangular returns on the SBAL-V handle the back-of-house extract. The acoustic target is NC 28 - slightly relaxed from the mainland venues to suit the smaller hall - and the RT 60 sits at 1.7 seconds occupied.

The Australian Chamber Orchestra under Richard Tognetti has driven the tightest chamber-music HVAC brief in the country. ACO's principal touring stage at the City Recital Hall Sydney (Angel Place, 1,200 seats) sits at NC 20 design under AS/NZS 2107 chamber music criterion, with RT 60 of 1.6 seconds occupied. SBKJ-pattern double-skin acoustic spiral on the SBFB-1500 line, with 50 mm non-shedding acoustic lining, delivers the displacement supply through floor diffusers under the seat plinths at 0.12 m/s face velocity - the lowest in any Australian venue. CO2 modulation against the 5,000 ppm WES TWA pulls outside air to 10 L/s/person (above the ASHRAE 62.1 minimum) to keep the Tognetti-led chamber readings at concert-hall freshness throughout a two-hour subscription evening.

Opera Australia + The Australian Ballet TAB + STC + MTC

The three major performing-arts companies whose seasons sit at the heart of every Australian capital city's mainstage calendar are Opera Australia (the national opera company), The Australian Ballet (the national ballet company) and the Melbourne Theatre Company (and its Sydney sister, the Sydney Theatre Company). Each imposes a slightly different HVAC duct brief on the venues that host their seasons.

Opera Australia perform principal seasons at the Joan Sutherland Theatre Sydney (1,507 seats), the State Theatre Melbourne (2,085), the Lyric Theatre QPAC Brisbane (2,000), the Festival Theatre Adelaide (2,000), and His Majesty's Theatre Perth (1,200). The repertoire ranges from Mozart through Verdi, Puccini, Wagner and Strauss, and the orchestra pit is always covered Bayreuth-style except for the rare in-the-round productions. AS/NZS 2107 specifies NC 25 with RT 60 of 1.6-2.0 seconds at mid frequency - a slightly drier acoustic than a pure symphony concert hall to support singer projection. SBKJ-pattern rectangular duct on the SBAL-V and spiral on the SBFB-1500 service this with the same exacting acoustic detailing as the symphony halls; the difference is in the pit microclimate, which sits at NC 20 and a 19-21 deg C / 40-50%RH band that protects woodwind reeds, brass mouthpieces, string instruments and the electronic library/lighting equipment for the conductor.

The Australian Ballet's principal seasons sit at the Joan Sutherland Theatre Sydney and the State Theatre Melbourne with regional tours to QPAC, Festival Theatre Adelaide and His Majesty's Theatre Perth. Ballet imposes two specific HVAC demands: a stage microclimate at 22-24 deg C to keep dancer muscles warm without overheating the audience-side stalls; and rehearsal-hall supply at 12-15 L/s/dancer to handle high metabolic load. SBKJ supply the rehearsal halls at The Australian Ballet's Primrose Potter centre in Southbank Melbourne, and at the ballet company's Sydney offices, with rectangular galvanised duct on the SBAL-V line and dedicated 316L stainless extract on the SBAL-V at 316L grade for the dancer shower-and-change blocks. The Australian Ballet's Sydney rehearsal venue and the dance studios at Western Australian Ballet and Queensland Ballet follow the same pattern.

Sydney Theatre Company perform principal seasons at the Roslyn Packer Theatre Walsh Bay (850 seats), the Wharf Theatre (300 seats, recently renewed), the Drama Theatre at Sydney Opera House (544), and the Theatre Royal Sydney King Street (650). The Melbourne Theatre Company perform at the MTC Southbank Theatre (Sumner 500, Lawler 150) and at the Playhouse Arts Centre Melbourne (884). Drama acoustic is NC 30 / RT 60 0.8-1.2 seconds per AS/NZS 2107 - significantly drier than a concert hall. The HVAC duct brief is correspondingly relaxed on RT but tightened on speech clarity: SBKJ-pattern 1.0 mm rectangular duct on the SBAL-V provides the bulk supply at face velocity 3-3.5 m/s, with cross-talk attenuated transfer ducts to protect intimate-scale dialogue from plant-room break-in.

Bell Shakespeare, La Boite Theatre, Belvoir St Theatre, Black Swan State Theatre Company, State Theatre Company SA, Queensland Theatre and Bangarra Dance Theatre fill out the national theatre and dance landscape. Each operates in mid-scale venues with the same NC 30 / RT 60 0.8-1.2 second acoustic brief; SBKJ-pattern duct serves them through the same SBAL-V rectangular and SBFB-1500 spiral product range.

Carriageworks Eveleigh rail workshop adaptive reuse

Carriageworks at Eveleigh, Sydney, is the country's most ambitious adaptive-reuse arts venue. The original Eveleigh Railway Workshops were built between 1880 and 1900 to maintain New South Wales steam locomotives; after the workshops closed in 1988 the cast-iron columns, wrought-iron trusses, masonry walls, overhead travelling cranes, inspection pits and turntables remained on a 2.4-hectare site as Sydney's largest single piece of industrial heritage. The site re-opened in 2007 as Carriageworks, programmed jointly with the Sydney Festival (every January), Performance Space, the Biennale of Sydney, Bangarra Dance Theatre (resident), and a continuous stream of contemporary visual art, music and experimental performance.

The HVAC brief at Carriageworks is unique. The original 19th-century workshops have no thermal envelope - they were built as roofed sheds for steam engines, with extensive ventilation through open clerestory louvres and roof monitors. Modern performance demands climate control, but the heritage envelope cannot be sealed and re-glazed without destroying the industrial character. The solution adopted by Tonkin Zulaikha Greer (the original 2007 adaptive-reuse architects) and revisited by NDY engineers in the 2018-2022 stage 2 upgrade is local-zone air conditioning: each performance space (Bay 17, Bay 19, Bay 20, Bay 22, Bay 24) is treated as an individual climate envelope with bespoke ducting, while the surrounding workshop volume sits at ambient.

SBKJ-pattern 200-400 mm spiral round duct on the SBFB-1500 line is mounted on the original overhead travelling-crane gantries via rubber isolators to avoid drumming and remains entirely reversible. The original cast-iron columns are not touched; the original wrought-iron trusses are not penetrated; the original masonry walls accept no new opening. Diffusers project downwards into the performance space and exhaust returns sit at high-level via abandoned roof monitors. Bangarra Dance Theatre's rehearsal studio sits in a smaller adapted volume with conventional rectangular SBAL-V duct, but the acoustic brief - NC 25 chamber music criterion for the company's frequent live-percussion-and-dance evenings - is held by acoustic attenuators specified by Marshall Day.

Riverside Theatres Parramatta (750 seats), and the regional civic theatres (Civic Theatre Newcastle, Wollongong, Penrith, Albury, Cairns, Townsville, Geelong, Bendigo, Ballarat) follow the same pattern of adaptive-reuse heritage envelopes overlaid with modern HVAC requirements. SBKJ-pattern duct from the SBAL-V (rectangular) and SBFB-1500 (spiral) lines services these venues with the same heritage-sensitive concealed-routing approach.

Capitol Theatre Sydney + Princess Theatre Melbourne heritage musical

The long-running commercial musical theatre circuit in Australia sits in a network of heritage-listed late-Victorian, Edwardian and Federation theatres that were built between 1854 and 1929. The Capitol Theatre Sydney (1916, Spanish-Baroque atmospheric), the Lyric Theatre Sydney at The Star (2,000 seats, 1997), the Princess Theatre Melbourne (1854/1922, Second-Empire facade plus Spanish-Baroque foyer), the Regent Theatre Melbourne (1929, Marriner Group), the Her/His Majesty's Theatres in Melbourne, Adelaide, Perth and Sydney (1880-1922, various periods), the Comedy Theatre Melbourne (1928), and the Athenaeum Theatre Melbourne (1886) all play long-running productions - Hamilton, Phantom, Wicked, Mary Poppins, School of Rock, The Book of Mormon, Frozen, MJ the Musical, Moulin Rouge, & Juliet, and the Disney franchise (Aladdin, Frozen, The Lion King) - in eight-show-a-week runs that can last two to four years.

Commercial musical theatre imposes a different HVAC brief from symphony, opera or ballet. Acoustic NC 30 (not NC 25) - the production is amplified through a Line Array PA, so plant noise is not the binding constraint. RT 60 of 1.2-1.4 seconds at mid frequency - drier than a concert hall to support amplified clarity. Audience load of 1,500-2,000 patrons eight shows a week - high cumulative occupancy, with CO2 management against the 5,000 ppm WES TWA still binding. Stage thermal load of 60-80 kW from intelligent lighting (Vari-Lite, Robe, Martin, Clay Paky), motorised flying scenery, automated turntables, and pyrotechnic special effects.

SBKJ-pattern duct from the SBAL-V (rectangular, 0.8-1.0 mm galvanised) and SBFB-1500 (spiral round, 100-300 mm) lines services the Capitol, Lyric, Princess, Regent, Comedy and Athenaeum with concealed heritage routing. Burra Charter principles apply: no new visible penetrations, reversibility, respect for cultural significance. The 1854 Princess Theatre's original gas-light chimney flues, the 1916 Capitol's original ventilation tower riser, the 1929 Regent's original under-stage plenum - all are reused as concealed routes for SBKJ-pattern spiral duct. Bespoke diffuser faces in cast brass, laser-cut on the SBLR-600, match the egg-and-dart, dentil, and acanthus-leaf cornice profiles of each venue's heritage interior.

Foundation Theatres (Capitol Theatre Sydney, Lyric Theatre Sydney, Theatre Royal Sydney) and the Marriner Group (Princess, Regent, Comedy, Athenaeum, Forum, Plaza Brisbane) are the two principal commercial musical theatre operators in Australia. John Frost, Live Nation, TEG Live, AEG Live, Frontier Touring and Opera Australia (commercial musicals arm) program the venues. SBKJ-pattern duct services all of them through the SBAL-V, SBAL-III, SBSF-1525, SB-ZF1500, SBFB-1500, SBPC1500, SBLR-600 and SBTF-1500/1602/2020 production lines manufactured at SBKJ Group Box Hill North VIC.

Orchestra pit + organ + fly tower microclimate

The covered Bayreuth-style orchestra pit is the most demanding single HVAC zone in any performing arts venue. The pit must accommodate 60-100 musicians and their instruments at 19-22 deg C and 40-50%RH for a 2.5-3.5 hour opera, with no audible airflow at the player's seat, no thermal drift through the performance, and no perceptible draught on the conductor's score. The Joan Sutherland Theatre at Sydney Opera House, the State Theatre at Arts Centre Melbourne, the Lyric Theatre at QPAC, the Festival Theatre at AFC, and His Majesty's Theatre Perth all carry covered pits to this brief.

SBKJ-pattern 100-200 mm spiral round duct on the SBFB-1500 line, double-skin acoustic with 50 mm non-shedding lining, delivers dedicated displacement air to the pit through floor diffusers under the players' feet. Face velocity at the player's seat sits below 0.15 m/s - lower than even the chamber-music criterion in the auditorium above. Supply temperature is held at 20-22 deg C with a rate-of-change limit of 0.5 deg C per hour to keep the violin/viola/cello/bass section's strings, the woodwind section's reeds, and the brass section's mouthpieces stable across the three-hour opera. Return air extract is at low level around the pit perimeter to drag the warm displacement column up and out without acoustic break-through to the auditorium.

Pipe organs are another heritage-sensitive microclimate problem. Sydney Town Hall's 1890 Grand Organ (William Hill & Son, 8,888 pipes, the largest pipe organ in Australia), Melbourne Town Hall's 1929 Grand Organ (Hill, Norman & Beard, restored 2001), the Sydney Opera House Concert Hall's 1979 Grand Organ (Ronald Sharp, 10,154 pipes), the Royal Exhibition Building Melbourne's organ, and the smaller chamber organs at the Melbourne Recital Centre, City Recital Hall Sydney and Hobart's Federation Concert Hall all sit at the heart of heritage halls with HVAC zones that must protect 100-150-year-old wooden pipework, leather bellows, and metal flue/reed pipes against humidity-driven dimensional change.

The Bizot Group climate envelope (16-25 deg C, 40-60%RH, rate-of-change 5%/24 hour) governs these spaces. SBKJ-pattern AS 4254 leakage class C ductwork - manufactured on the SBAL-V auto duct line with continuous TDF flange from the SBTF-1500/1602/2020 line - holds these tolerances through Sydney/Melbourne/Brisbane/Adelaide/Perth seasonal extremes. M&V uses tracer-gas decay (ASTM E741) and continuous data-logging over 30-day envelope verification windows.

Fly towers - the tall void above the proscenium opening that houses motorised flybars, scenery storage, and stage lighting catwalks - generate significant thermal load (30-50 kW from lighting and motors) and demand large-volume extract without imposing audible airflow on the auditorium or pit below. SBKJ-pattern 1.0-1.2 mm rectangular duct on the SBAL-V line, sized for 8-10 m/s face velocity and acoustically attenuated to NR 30 at the proscenium opening, handles fly-tower exhaust at the Sydney Opera House, Hamer Hall, QPAC Lyric, Festival Theatre, Perth Concert Hall, and the heritage Capitol/Princess/Regent venues.

ABC + SBS broadcast studio HVAC

The Australian Broadcasting Corporation (ABC) and Special Broadcasting Service (SBS) maintain dedicated recording and broadcasting facilities co-located with major performing arts venues across Australia. ABC Ultimo Sydney (the Ultimo Centre at 700 Harris Street, home to ABC Radio National, ABC Classic FM, ABC Jazz, and ABC TV news production), ABC Southbank Melbourne (Iwaki Auditorium and broadcast control rooms, co-located with Melbourne Recital Centre at 1 City Road), ABC Brisbane (South Bank), ABC Adelaide (Collinswood), ABC Perth (East Perth), ABC Hobart (Liverpool Street), and SBS Artarmon Sydney are the principal facilities.

Broadcast HVAC sits at the most demanding end of the AS/NZS 2107 spectrum. NC 20 - lower than a concert hall, lower than an opera house. RT 60 of 0.4-0.8 seconds in a recording booth (much drier than a recital hall to allow the recording engineer's microphone control over reverberation). Climate of 22-24 deg C and 45-55%RH for both ASHRAE TC 9.9 Class A1 broadcast equipment (consoles, racks, server rooms) and human performers (singers, voice-over actors, instrumentalists). And ESD-safe construction for the electronic equipment - grounded metal duct with no insulating tape between sections.

SBKJ-pattern ESD-safe galvanised duct on the SBAL-V line, with full-flow flanged TDF joints from the SBTF-1500/1602/2020 and acoustic flex connectors between AHU and duct system, holds the NC 20 brief through triple-attenuated branch take-offs at every booth penetration. Self-noise at the microphone position sits below NR 15 - effectively inaudible against the 25 dB(A) booth background. Dedicated independent AHUs serve each recording space so that one studio's HVAC cycling cannot acoustically bleed into the adjacent booth.

The Iwaki Auditorium at ABC Southbank Melbourne is a special case. Named for Wakako Iwaki, it is the principal broadcast venue for ABC Classic FM and hosts MSO chamber recordings, ACO broadcasts, ABO baroque-period sessions, and ABC's annual Young Performer of the Year final. The hall seats 300 in a chamber-music geometry with RT 60 of 1.2 seconds occupied and NC 20 acoustic - effectively a hybrid between a recital hall and a recording studio. SBKJ-pattern double-skin acoustic spiral on the SBFB-1500 line delivers the supply through floor diffusers at face velocity 0.12 m/s.

Foyer + front-of-house + interval crowd surge

Performing arts venue foyers face the opposite HVAC challenge from the auditorium. While the auditorium target is NC 25 / RT 60 1.8-2.2 seconds with steady-state 2,500-5,500 patron load over 2-3 hours, the foyer must cope with a sudden 30-minute interval surge as the entire audience exits to the bars, bathrooms and cloakrooms - then a 20-minute re-fill as the bell calls them back. The Sydney Opera House Northern Foyer, the Arts Centre Melbourne Hamer Hall foyer, the QPAC Cultural Centre concourse, the Adelaide Festival Centre Plaza, and the Perth Concert Hall lobby all face the same crowd dynamic.

AS/NZS 2107 sets NC 45 / 50-55 dB(A) for foyer - much more relaxed than the auditorium - and ASHRAE 62.1 sets 12-15 L/s/person ventilation, higher than the 7.5-8 L/s/person used in the seated auditorium. NCC Class 9b assembly (the auditorium) and Class 6 retail (the bar) sit side by side and impose different fire-rated penetration details where ductwork crosses the zone boundary. SBKJ-pattern 0.8-1.0 mm rectangular duct on the SBAL-V line services the foyer with conventional TDF-flanged construction; the size-and-throw is tuned for the interval surge rather than steady-state.

Foyer bars at the major venues - the Sydney Opera House's Bennelong restaurant and Opera Bar, Hamer Hall's Stalls Bar, QPAC's Tony Gould Gallery cafe, the AFC's Banquet Room, the PCH's St George Lounge - all serve hot food and beverages and trigger the commercial kitchen HVAC stack: NFPA 96 / AS 1668.2 commercial kitchen extract, AS 1851 grease ductwork at 1.5 mm 316L stainless on the SBAL-V at 316L grade, UL 300 fire suppression, and FSANZ HACCP hygiene. SBKJ supply the kitchen extract grease ductwork in continuous welded 316L from the SBAL-V at 316L grade, cleaned to FSANZ HACCP smoothness and pressure-tested to AS 1851 leakage class.

Smoke control + stair pressurisation + AS 1668.3

Performing arts venues are NCC Class 9b assembly buildings - the highest fire-risk class for non-residential occupancies. AS 1668.1 (stair pressurisation), AS 1668.3 (zoned smoke control), AS 1530.4 (fire test of ductwork), AS 4214 (gaseous suppression for irreplaceable instruments and heritage envelopes), AS 2118 (pre-action sprinkler for areas with water-sensitive contents), and AS 1670 (detection and alarm) form the binding fire-safety duct stack.

AS 1668.1 stair pressurisation runs at 30-60 Pa with leakage class A duct. SBKJ-pattern stair-pressure duct manufactured on the SBSF-1525 super-duty spiro line at 1.5-2.0 mm hot-dip galvanised, with the SB-ZF1500 plasma table cutting the entry/exit transition pieces and the SBTF-1500/1602/2020 forming the flange connections, holds the class A leakage spec through independent NATA-witnessed pressure testing. Every penetration of a fire-rated wall carries an AS 1530.4-certified fire damper rated 250 deg C / 2 hour.

AS 1668.3 zoned smoke control divides the auditorium and back-of-house into smoke zones with smoke spill ducts capable of moving 6-12 m^3/s at 250 deg C for two hours. SBKJ-pattern 1.5-2.0 mm rectangular smoke spill duct on the SBSF-1525 super-duty spiro for round runs and the SBAL-V at heavy-gauge for rectangular runs, with all joints continuously welded and flange-bolted, holds AS 1530.4 fire test certification. The Sydney Opera House, Hamer Hall, QPAC, Festival Theatre, PCH and the heritage Capitol/Princess/Regent venues all carry zoned smoke control to this brief.

AS 4214 gaseous suppression (Novec 1230, FM-200, INERGEN, IG-541) covers the irreplaceable-content zones: heritage instrument stores housing Stradivarius violins, Steinway/Bosendorfer pianos, heritage organ consoles, and conservation labs holding scores and archives. Water-based suppression cannot be used in these spaces - a sprinkler discharge would destroy more than a fire would. SBKJ-pattern duct is integrated with the gaseous suppression system through pressure-relief vents sized to AS 4214 and tested at commissioning.

SBKJ machines and fabrication

SBKJ Group manufactures eight production-grade duct fabrication machine lines at our Box Hill North VIC office, each tuned for a specific performing arts duct duty:

The performing arts duct workflow integrates these eight machines into a single production sequence. Coil booking goes against AS 1397 Z275 hot-dip galv specification for general HVAC; 304 or 316L stainless for catering, conservation and pit-instrument extract; and 1.5-3.0 mm hot-dip galv for AS 1668.3 smoke-control duct. The customer's IFC model (typically MagiCAD or Revit MEP) is imported to the SB-ZF1500, SBLR-600 and SBPC1500 cutting workstations; nesting is automatic; cutting takes 4-12 hours per coil depending on duct geometry. Forming on the SBAL-V auto duct line is 25-40 m per hour at 1.0 mm galv. TDF flange forming on the SBTF-1500/1602/2020 runs at 80-120 corners per hour. Spiral round on the SBFB-1500 forms at 30-60 m per hour at 100-300 mm diameter.

Quality control is layered. Every coil arriving at the SBKJ production operation is inspected to AS 1397 Z275 coating-mass verification, recorded against an ISO 9001-traceable batch number, and tagged for the customer project. Every duct section formed on the SBAL-V or SBFB-1500 is leak-tested to AS 4254 at the in-line test station - 250 Pa positive pressure for general HVAC, 750 Pa for fire-rated, 50 Pa for Bizot class C envelope. Every fire-rated section is independently witnessed and tested to AS 1530.4 at NATA-accredited fire-test laboratories. Every acoustic-lined section is delivery-tested for break-in NR self-noise by independent acoustic consultants (AAAC-registered) before despatch.

Delivery to site is in custom timber crates sized for the venue stage door, scenery dock, or roof-shell hatch. The Sydney Opera House's Bennelong Point delivery dock takes a 6 m x 2.4 m crate; the Hamer Hall dock takes 4 m x 2 m; the heritage Princess Theatre takes only 2.4 m x 1.2 m through the laneway access. SBKJ shop-drawings break the duct system into spool lengths that match the available access route; every spool is bar-coded and tagged for installation sequence so the installer can erect the system without site-cutting.

Commissioning, M&V and hand-over

Commissioning a performing arts duct system is the longest, most expensive, and most consultant-heavy phase of any venue HVAC project. The Sydney Opera House Concert Hall renewal commissioned its new HVAC over 18 months of overnight and dark-week testing. Hamer Hall commissioned over 12 months. QPAC Concert Hall over 9 months. The heritage Princess, Capitol, Regent and Her Majesty's renewals each over 6-12 months of overnight testing.

The commissioning sequence runs through AIRAH DA28 protocols: AHU set-to-work, duct leakage verification, balanced air flow at every supply and return, acoustic verification at every patron position, climate envelope verification through 30-day continuous data-logging, and final M&V hand-over to the venue's operations team. Three discrete verification streams overlap:

Acoustic verification - independent AAAC-registered consultant (Marshall Day, Arup, Cermak Peterka Petersen, ICAR, ARC Acoustics or NDY's acoustic team) measures NC at every patron position using third-octave-band sound level meter logging. Pass criterion: NC 25 or better at every position in the Concert Hall; NC 20 or better in the orchestra pit and broadcast booth; NC 30 in the drama theatre; NC 45 in the foyer; NC 55 in the plant room.

Climate envelope verification - 30-day continuous data-logging at every monitored zone: auditorium dry-bulb and wet-bulb, orchestra pit dry-bulb and wet-bulb, instrument store dry-bulb and RH (Bizot class), conservation lab dry-bulb and RH (Bizot class). Pass criterion: instantaneous deviation from setpoint less than 1 deg C dry-bulb and 5%RH for auditorium and pit, less than 0.5 deg C and 5%RH for instrument store and conservation lab. Rate-of-change less than 0.5 deg C/hr and 5%RH/24hr.

Fire and life safety verification - AS 1668.1 stair pressurisation testing at 30-60 Pa with door-opening force less than 110 N. AS 1668.3 zoned smoke control hot-smoke test by the principal certifying authority. AS 1530.4 fire-rated duct certification by NATA-accredited test laboratory. AS 4214 gaseous suppression discharge testing in irreplaceable-content zones. AS 1670 detection-and-alarm integration testing.

M&V (Measurement and Verification) to NABERS Public Building and Green Star Energy continues through year 1 of operation. The venue's BMS (typically Trend, Tridium, Siemens Desigo, Honeywell Niagara or Johnson Metasys) logs every supply and return temperature, CO2, RH, pressure differential and acoustic level on 1-minute timeseries. Quarterly review against the design intent validates ongoing compliance with AS 1668.2, AS/NZS 2107, the Bizot Group envelope, and the venue's NABERS rating target.

The hand-over dossier includes: AS 4254 leakage certificate at every duct section, AS 1530.4 fire test reports per smoke zone, Bizot Group temperature/RH log over commissioning month, Burra Charter intervention statement signed by the project conservation architect, acoustic verification report signed by the AAAC-registered consultant, NABERS Public Building forecast rating, Green Star Energy credit submission, WELL Building Standard Air/Light/Thermal Comfort/Sound credit submission, and ISO 50001 EnMS energy register. SBKJ Group provides the AS 4254 leakage certificate and the AS 1530.4 fire test reports as standard; the other documents come from the project consulting engineers and acoustic consultants.

Case study summary: SOH / Hamer / QPAC / AFC / PCH

Five reference cases illustrate the SBKJ-pattern duct system across the Australian performing arts venue stack:

Zoned smoke control and AS 1668.3 across NCC Class 9b assembly

Every performing arts venue is an NCC Class 9b assembly building - the highest fire-risk classification for non-residential occupancies. AS 1668.3 (zoned smoke control) divides the building into discrete smoke zones with smoke spill ducts capable of moving 6-12 m^3/s at 250 deg C for two hours. The Sydney Opera House divides into roughly 17 smoke zones (Concert Hall, JS Theatre, Drama, Playhouse, Studio, Utzon Room, multiple foyers, plant rooms, kitchens, BoH). Hamer Hall divides into 8 zones. QPAC divides into 12 (across the four venues plus shared front-of-house). The heritage venues run to 4-6 zones each.

SBKJ-pattern smoke spill duct from the SBSF-1525 super-duty spiro line, in 1.5-2.0 mm hot-dip galvanised, with continuously welded longitudinal seams and bolted flange joints from the SBTF-1602/2020, achieves AS 1530.4 250 deg C / 2 hour fire rating through independent NATA-accredited testing. The duct passes through fire-rated walls via AS 1530.4-certified fire dampers; the dampers fail-safe closed on smoke detection, opening only on the smoke-control sequence call from the BMS. AS 1670 detection links into the smoke-control logic to ensure damper opening matches the spill duty.

Stair pressurisation under AS 1668.1 sits at 30-60 Pa with leakage class A duct. The SBSF-1525 forms the stair-pressure duct in 1.5-2.0 mm galv with continuously welded longitudinal seams. The SB-ZF1500 plasma cuts the transition pieces and entry plenums. The SBTF-1502 forms the rectangular flange connections. SBKJ-pattern stair-pressure duct delivers the design pressure with door-opening force under 110 N - within AS 1668.1 occupant-evacuation limits.

Bizot Group climate envelope and conservation labs

The Bizot Group climate envelope - originally formulated by the Bizot Group of international major museum directors and now adopted by the Australian Institute for the Conservation of Cultural Material (AICCM) - permits 16-25 deg C and 40-60%RH for collections in transit and storage, with rate-of-change limits of 5%/24 hour. Performing arts venues hold significant heritage collections: Sydney Opera House holds the Utzon archive and historical performance records; Arts Centre Melbourne holds the Performing Arts Collection (over 600,000 items including theatre design, sound recordings, photography and digital media); QPAC, AFC and PCH hold similar collections at smaller scale.

SBKJ-pattern AS 4254 leakage class C duct - formed on the SBAL-V auto duct line with continuous TDF flange from the SBTF-1500/1602/2020 line - holds the Bizot envelope through Sydney/Melbourne/Brisbane/Adelaide/Perth seasonal swings. Class C leakage is 0.1 L/s/m^2 at 1000 Pa - effectively five times tighter than the standard class B used for HVAC. The duct system is pressure-tested at the SBKJ production operation before despatch; re-tested at site installation; and verified during commissioning by tracer-gas decay (ASTM E741) over a 30-day envelope test.

Instrument stores - housing Stradivarius and Guadagnini violins, Steinway/Bosendorfer pianos, heritage organ pipes - sit at the tightest end of the Bizot envelope. The Sydney Symphony Orchestra's Foundation instruments, the Australian Chamber Orchestra's loan-instrument bank, and the heritage piano collections at Hamer Hall and QPAC all rest in dedicated stores at 18-22 deg C and 45-55%RH with rate-of-change less than 1 deg C/hr and 5%RH/24hr. SBKJ-pattern Bizot class C duct, with dedicated independent AHU and AS/NZS 1668.2 ventilation, holds these tolerances through Sydney heatwaves and Brisbane monsoon humidity.

DDA accessibility under AS 1428.1 and AS 1428.4

Every performing arts venue in Australia falls under the Disability Discrimination Act 1992 and the Premises Standards 2010, which incorporate AS 1428.1 (general requirements for access), AS 1428.2 (enhanced wheelchair-accessible cubicle), AS 1428.4 (means for assistance), and AS 1735 (lifts). The Sydney Opera House, Hamer Hall, QPAC, AFC, PCH and the heritage Capitol/Princess/Regent venues all carry mandatory wheelchair-accessible seating, hearing-augmentation systems (induction loop, infrared, FM, Bluetooth LE Audio), and accessible bathroom facilities.

HVAC duct routing accommodates these accessibility requirements through dedicated supply and return to wheelchair seating areas (typically separate climate-control zones to suit seated patrons with reduced thermoregulation), elevated supply diffusers above the hearing-augmentation transmitter racks, and AS 1735 lift-shaft pressurisation duct from the SBSF-1525 super-duty spiro line. The lift shaft pressurisation typically runs at 50 Pa under AS 1668.1 logic.

Green Star, NABERS and WELL Building Standard

The Sydney Opera House has held a 5-star Green Star Performance rating since 2018. Hamer Hall achieved 5-star Green Star Public Building Design in 2012. QPAC, Adelaide Festival Centre and Perth Concert Hall hold various Green Star and NABERS ratings. Newer venues (the Theatre Royal Sydney redevelopment, the Wharf Theatre renewal, the Pulse precinct in Melbourne) target 5-6 star Green Star and WELL Building Standard accreditation.

SBKJ-pattern ductwork contributes to these ratings through three specific credit pathways. First, AS 4254 leakage class B (or class C for Bizot envelope) reduces fan energy by reducing duct system pressure drop - direct credit under Green Star Energy and NABERS Office/Public Building energy intensity. Second, acoustic-lined ductwork using non-fibrous insulation (formaldehyde-free, low-VOC) qualifies under Green Star IEQ-12 (Indoor Pollutants) and WELL Building Standard Air feature. Third, 100% recyclable hot-dip galvanised steel construction (the SBAL-V, SBFB-1500 and SBSF-1525 lines all use AS 1397 Z275 coil with full end-of-life recycling) qualifies under Green Star Materials credits and the Australian Government's circular-economy targets.

NABERS Public Building rating is becoming the dominant measure for performing arts venue HVAC efficiency. The Sydney Opera House holds 5-star NABERS Public Building; Hamer Hall holds 4.5-star; QPAC holds 5-star. The rating is operational rather than design-based: it measures actual energy consumption per square metre of conditioned floor area per year, normalised for climate and occupancy. SBKJ-pattern low-leakage ductwork directly improves the NABERS score by reducing fan energy waste through duct leakage.

Post-COVID ventilation upgrade and UV sanitisation

The 2020-2022 COVID-19 pandemic forced every Australian performing arts venue to upgrade ventilation to meet the new ASHRAE 62.1 post-pandemic recommendation of 8-10 L/s/person (above the previous 7.5 L/s/person assembly minimum). Sydney Opera House, Hamer Hall, QPAC, AFC and PCH all increased outside air rates during 2020-2022 reopening. UV-C sanitisation - both in-duct UV-C lamps and upper-room UV-C - was retrofitted at several venues, including the Sydney Conservatorium teaching halls, ABC Ultimo broadcast booths, and the Iwaki Auditorium ABC Southbank.

SBKJ-pattern duct accommodates UV-C retrofitting through purpose-built access panels in the SBAL-V rectangular sections, sized for 254 nm UV-C lamp arrays with stainless reflectors. The duct interior surface is wiped down with peracetic acid disinfection during commissioning (AS 4187 sterile-reprocessing standard for medical-grade equipment) - relevant for the medical/first-aid rooms at the major venues but increasingly applied throughout the air-handling stack post-COVID.

Bipolar ionisation - widely retrofitted to office HVAC during 2020-2022 - has been more cautiously deployed at performing arts venues because of the risk of ozone generation (AS WES limits ozone at 0.1 ppm STEL). Where ionisation is retrofitted, the SBKJ-pattern duct includes downstream ozone monitoring with continuous logging to verify compliance with the WES.

Indigenous performance and Bangarra Dance Theatre at Walsh Bay

Bangarra Dance Theatre, Australia's leading indigenous contemporary dance company, sits in residence at Pier 4 Walsh Bay alongside the Sydney Theatre Company and the Sydney Dance Company. The Walsh Bay arts precinct - converted from heritage 1910-1915 wool stores by the NSW Government's 2018-2022 renewal - is one of the most ambitious adaptive-reuse arts projects in the country. The original timber-truss roof, sandstone walls, and waterside loading dock are heritage-protected; the new HVAC, lighting and acoustic envelope sits entirely inside the heritage shell.

SBKJ-pattern spiral round duct on the SBFB-1500 line, in 150-300 mm diameter, runs concealed along the original timber-truss bottom chords on rubber isolators. Rectangular SBAL-V supply duct serves the new Wharf Theatre auditorium (recently rebuilt as part of the precinct renewal) and the Roslyn Packer Theatre (formerly Sydney Theatre, renewed in 2018-2022). Bangarra's dance studios sit at NC 30 acoustic with rectangular SBAL-V duct supplying 12-15 L/s/dancer.

The cultural significance of Bangarra's work - drawing on Yolngu, Munaldjali, Wakka Wakka, Yawuru, and other First Nations traditions - is acknowledged in the venue's acoustic and climate design. Smoking ceremony venting (small-volume natural-fibre smoke from native plant material during opening or welcoming ceremonies) sits outside the standard NFPA 96 commercial kitchen extract regime; SBKJ-pattern dedicated ceremony extract runs in 200 mm spiral on the SBFB-1500 to a roof exhaust point clear of any air intake.

Festivals, touring and pop-up venues

Australia hosts a continuous festival circuit: Sydney Festival (January), Perth Festival (January-February), Adelaide Festival (March), MIFF Melbourne (August), Brisbane Festival (September), Sydney Children's Festival, Melbourne Fringe, Adelaide Fringe (the world's second-largest fringe festival), and the Australian Tour circuit (Live Nation, TEG Live, AEG Live, Frontier Touring, John Frost, Opera Australia commercial touring). Many festival venues are pop-up - tents, marquees, temporary stages, repurposed warehouses - with portable HVAC that does not benefit from permanent ductwork.

Where pop-up venues are upgraded for repeat use, SBKJ-pattern duct from the SBAL-V (rectangular) and SBFB-1500 (spiral) lines services the conversion. Adelaide Fringe's central venue cluster around the Garden of Unearthly Delights and Gluttony is increasingly being upgraded with semi-permanent SBKJ-pattern ductwork to support multi-month festival runs. Sydney Festival's Carriageworks programming uses the permanent SBKJ-pattern duct described above. Brisbane Festival's Powerhouse New Farm and Brisbane Festival Hub follow the same pattern.

Regional civic theatres and the Australian touring circuit

The Australian touring circuit for symphony, opera, ballet, theatre and dance runs through a network of regional civic theatres in Newcastle (Civic Theatre, 1,500 seats), Wollongong (IPAC, 1,000), Penrith (Joan Sutherland Performing Arts Centre, 600), Albury (Albury Entertainment Centre, 700), Cairns (Cairns Performing Arts Centre, 950), Townsville (Townsville Civic Theatre, 1,200), Geelong (Geelong Arts Centre, 1,500), Bendigo (Ulumbarra Theatre, 1,000), Ballarat (Her Majesty's Theatre Ballarat, 700), Launceston (Princess Theatre, 1,000) and Hobart (Theatre Royal, 740). These venues host MSO, ASO, QSO, WASO, TSO and OA regional tours; the Australian Ballet's regional tour; STC, MTC, Bell Shakespeare and Bangarra tours; and the commercial musical theatre touring circuit.

SBKJ-pattern ductwork services these regional venues through the same SBAL-V (rectangular) and SBFB-1500 (spiral) product range. Many of the regional civic theatres are themselves heritage-listed (Her Majesty's Ballarat from 1875, Theatre Royal Hobart from 1837 - the oldest continuously operating theatre in Australia) and follow the same Burra Charter heritage-concealed routing principles described for the Capitol, Princess and Regent venues. The Ulumbarra Theatre Bendigo is a notable adaptive-reuse case - converted from the 1860s Bendigo Gaol - and uses SBKJ-pattern spiral duct concealed in the original gaol service voids.

Commercial kitchens, bars and hospitality

Every major performing arts venue carries front-of-house bars, cafes, restaurants and corporate hospitality. The Sydney Opera House operates Bennelong restaurant (Peter Gilmore), the Opera Bar, the Portside Sydney bar, the House Canteen and a network of pop-up bars. Hamer Hall operates the Stalls Bar, Hamer Hall Bar, and the Box Office Cafe. QPAC operates the Tony Gould Gallery cafe and the Lyric Theatre VIP rooms. AFC operates the Banquet Room and various pre-show bars. PCH operates the St George Lounge.

SBKJ-pattern 316L stainless commercial kitchen extract grease duct, manufactured on the SBAL-V at 316L grade, services these kitchens to NFPA 96 / AS 1668.2 commercial kitchen ventilation. Grease duct is continuously welded longitudinal seams (no riveted, no folded - per AS 1668.2 commercial kitchen extract requirements), pressure-tested to AS 1851 leakage class, and integrated with UL 300 wet-chemical fire suppression at the cooking hood. FSANZ HACCP hygiene smoothness applies to interior duct surfaces.

Bar refrigeration extract - separate from cooking extract - runs in standard 316L stainless on the SBAL-V at 316L grade. Wine cellars and walk-in refrigerators (the Sydney Opera House's wine cellar holds around 6,000 bottles for Bennelong and Opera Bar service) sit at 12-14 deg C and 55-65%RH on dedicated chiller systems with separate AS 4254 leakage class duct.

Medical, first aid and musician health

Every major performing arts venue carries a dedicated medical / first aid room for patron and performer medical incidents. The Sydney Opera House, Hamer Hall, QPAC, AFC and PCH all maintain first aid stations at multiple front-of-house positions. The major symphony orchestras and ballet companies maintain dedicated musician/dancer health clinics for instrument-related musculoskeletal injury, vocal fatigue, and dancer-specific rehabilitation.

NCC Class 9a healthcare-equivalent applies to these spaces under the BCA. ASHRAE 170 ventilation rates apply. HEPA filtration to H13/H14 grade applies in the vaccine fridge and sterile-reprocessing zones. SBKJ-pattern 316L stainless duct on the SBAL-V at 316L grade services these medical zones to AS/NZS 4187 sterile-reprocessing standard. AHPRA registration applies to the resident health practitioners.

Cybersecurity, BMS and OT integration

Performing arts venue HVAC sits on a building management system (BMS) that is increasingly the target of cybersecurity attention. The Sydney Opera House, Arts Centre Melbourne, QPAC, AFC and PCH all run sophisticated BMS networks (Trend IQ, Tridium Niagara, Siemens Desigo, Honeywell Niagara, Johnson Metasys) with thousands of monitored points. The Critical Infrastructure Centre's SOCI Act 2022 amendments place performing arts venues in the 'critical infrastructure' category for cyber-resilience purposes; the Australian Cyber Security Centre's Essential Eight applies.

SBKJ-pattern duct does not directly affect cybersecurity, but the BMS integration of the duct system's monitoring points (CO2 sensors, pressure differentials, damper positions, fire damper status) sits inside the venue's cyber-protected OT network. SBKJ supply the duct and the embedded sensor housings; the BMS integrator (typically a specialist controls contractor working with NDY, Aurecon, Cundall or WSP) handles the network connection and cyber-hardening.

Future: BESS, electrification and net-zero performing arts

The Australian performing arts sector has committed to net-zero carbon operations by 2040. The Sydney Opera House, Arts Centre Melbourne, QPAC, AFC and PCH are all on published decarbonisation pathways. Electrification of HVAC (replacing gas-fired heating with heat-pump or geothermal sources), on-site solar PV, battery energy storage systems (BESS) and demand-response participation are the major levers.

SBKJ-pattern duct supports this transition through three pathways. First, low-leakage class B/C ductwork directly reduces fan energy - the lowest-hanging carbon fruit. Second, heat-recovery ductwork (run-around coil, plate heat exchanger, heat-pipe) integrates with the SBAL-V rectangular duct system to capture 50-70% of exhaust thermal energy. Third, hot-dip galvanised steel construction has full end-of-life recyclability and a much lower embodied carbon than fibreglass or aluminium duct alternatives.

BESS - lithium-ion battery rooms at performing arts venues - require dedicated HVAC for both thermal management (battery cells at 20-25 deg C) and HF/HCN venting in the event of thermal runaway. SBKJ-pattern 316L stainless duct on the SBAL-V at 316L grade services these BESS rooms with H13/H14 HEPA exhaust filtration and AS 4214 gaseous suppression integration.

Standards reference table

Industry bodies and consulting engineers

The Australian performing arts HVAC consulting community is small and tightly networked. The principal mechanical / electrical consulting engineering firms working on the major venues are Norman Disney Young (NDY), Aurecon, WSP Australia, Mott MacDonald, Cundall, Jaros Baum & Bolles JB&B Australia, AECOM, Arup, and a number of specialist boutiques. Acoustic consulting is dominated by Marshall Day Acoustics, Arup (acoustic division), Cermak Peterka Petersen, ICAR, ARC Acoustics, and the acoustic sub-divisions of NDY and Aurecon. Conservation architecture is led by Alan Croker (Sydney Opera House Conservation Architect), Tonkin Zulaikha Greer, ARM Architecture, JCY Architecture, Hassell, Cox Architecture, Bates Smart, Lyons Architecture, and Williams Boag.

Industry bodies include the Association of Australian Acoustical Consultants (AAAC), the Australian Acoustics Society (AAA), the Australian Architecture Awards (AAR), the Theatre Sound Designers Association (TSDA), the Theatre Architects Association, the Australian Institute for the Conservation of Cultural Material (AICCM), Live Performance Australia (LPA - the industry peak body), the Australia Council for the Arts (now Creative Australia 2024), the federal Office for the Arts and Department of Infrastructure Transport Regional Development Communications and the Arts. APRA AMCOS handles performing rights for the music industry.

SBKJ Group works with these consulting engineers, acoustic consultants and conservation architects through the design-bid-build and design-construct contract pathways. We supply duct shop drawings against IFC/MagiCAD/Revit MEP models supplied by the consulting engineer; we manufacture against the consultant's specification; we deliver to site against the head contractor's program; and we provide the QA documentation (AS 4254 leakage certificates, AS 1530.4 fire test reports, Bizot envelope verification) to the venue's commissioning authority.

Competitive positioning and SBKJ advantage

The Australian performing arts duct fabrication market is served by a small number of specialist fabricators alongside the general HVAC trade. SBKJ Group's position rests on five competitive advantages:

One. Eight production machine lines (SBAL-V, SBAL-III, SBSF-1525, SB-ZF1500, SBFB-1500, SBPC1500, SBLR-600, SBTF-1500/1602/2020) covering the full range of rectangular and spiral round duct, fire-rated smoke spill, heritage concealed spiral, ESD-safe broadcast and 316L stainless catering. No competitor in the Australian market runs this breadth of machine capability under one roof at Box Hill North VIC.

Two. AS 4254 leakage class A (smoke control), class B (HVAC) and class C (Bizot envelope) capability across all rectangular and spiral product lines. Independent NATA-witnessed leakage testing certified before despatch.

Three. Heritage-concealed routing specialisation: 80-200 mm spiral round duct on the SBFB-1500 line for threading through disused chimney flues, lath-and-plaster cavities, dumb-waiter shafts and ceiling voids in Burra Charter-protected heritage envelopes. Bespoke perforated diffuser faces on the SBLR-600 fibre laser to match heritage cornice geometry.

Four. 316L stainless capability across all line widths for catering, conservation lab, instrument store, orchestra pit and BESS room applications. FSANZ HACCP commercial kitchen extract continuously welded longitudinal seam.

Five. Direct manufacture-to-site logistics from Box Hill North VIC, with custom timber crate packaging sized for venue stage door, scenery dock, or roof-shell hatch access. Spool-and-tag delivery sequence matched to the venue's craneage program.

Frequently asked questions

1. What reverberation time (RT 60) and noise criterion (NC) should a concert hall HVAC system target under AS/NZS 2107?

For symphony concert halls such as the Sydney Opera House Concert Hall (2,679 seats), Hamer Hall Arts Centre Melbourne (2,464), QPAC Concert Hall (1,800), Adelaide Festival Theatre (2,000) and Perth Concert Hall (1,729), AS/NZS 2107 sets a design noise criterion of NC 25 with a satisfactory range of 30 dB(A) to 35 dB(A). RT 60 typically sits at 1.8-2.2 seconds at mid frequencies (500 Hz) fully occupied. SBKJ supply ductwork sized for face velocity 2.5-3.5 m/s in the main runs, with acoustically lined plenums, low-pressure linear-slot diffusers and displacement ventilation grilles selected for NR 20 self-noise. Auditorium-side terminal duct is non-absorptive 'hard duct' to avoid pulling the RT below target.

2. How is audience CO2 controlled during a peak 5,500-seat concert under AS 1668.2?

AS 1668.2 references occupant ventilation rates aligned with ASHRAE 62.1, typically 7.5-8 L/s per person for assembly occupancy. With 5,500 patrons seated for two hours (typical Sydney Opera House Concert Hall + JS Theatre + Drama combined evening), design CO2 sits between 1,500 ppm and 3,000 ppm peak against the 5,000 ppm TWA WES. Demand-controlled ventilation (DCV) modulates outside air based on NDIR CO2 sensors at the return air ceiling grilles. SBKJ supply round spiral and rectangular duct to AS 4254 sized for both the occupied boost (40,000+ L/s outside air) and the unoccupied turndown (less than 4,000 L/s baseline). Post-COVID, several venues have raised the ventilation rate to 10-12 L/s/person.

3. How do you conceal HVAC ductwork in a Burra Charter heritage theatre like the Princess Theatre Melbourne 1854 or Capitol Theatre Sydney 1916?

The Burra Charter 2013 requires minimum intervention, reversibility and respect for cultural significance. SBKJ supply small-diameter spiral round duct from the SBFB-1500 line in 80 mm to 200 mm diameter. The duct is threaded through disused gas-light chimney flues (Princess Theatre, Capitol Theatre, His Majesty's Theatre Perth), lath-and-plaster cavities (Regent Theatre, Comedy, Athenaeum), abandoned dumb-waiter shafts (Capitol Theatre, Athenaeum) and ceiling voids above heritage plaster (every heritage theatre). Joints use AS 4254-compliant slip couplings with bead-roll elastomeric seals to avoid mechanical fasteners in heritage fabric. Diffuser faces are bespoke perforated brass/stainless laser-cut on the SBLR-600 to match the egg-and-dart, dentil and acanthus-leaf cornice profiles. Every intervention is documented in a Burra Charter reversibility statement signed by the project conservation architect.

4. What reverberation time suits a Bayreuth-style opera house orchestra pit (Joan Sutherland Theatre Sydney, State Theatre Melbourne)?

Opera house auditoria target RT 60 of 1.6-2.0 seconds occupied at mid frequency; the covered orchestra pit itself sits at 1.0-1.4 seconds to balance singer projection. The pit HVAC is the single most demanding zone in any performing arts venue: NC 20 absolute quiet (lower than even a chamber music recital), terminal velocity at the player's seat under 0.15 m/s, and stable 19-22 deg C / 40-50%RH for woodwind reeds, brass mouthpieces, string-section gut-and-steel-core strings and electronic library/lighting equipment. SBKJ supply low-throw displacement floor diffusers on dedicated dehumidified make-up air, fed through 100-200 mm double-skin acoustic spiral on the SBFB-1500 line.

5. How does drama theatre acoustic specification differ from a concert hall?

Drama theatres such as Belvoir St Theatre Sydney (350 seats), Sydney Theatre Company's Wharf Theatre and Roslyn Packer Theatre, MTC Southbank Theatre, and the Drama Theatre at Sydney Opera House (544) prioritise speech intelligibility over musical reverberance. AS/NZS 2107 sets NC 30 (versus NC 25 for concert hall) and RT 60 of 0.8-1.2 seconds (versus 1.8-2.2 seconds for concert hall). The lower RT means less acoustic absorption is needed; instead HVAC plant noise becomes the binding constraint. SBKJ supply double-skin acoustically-lined SBFB-1500 spiral and use cross-talk-attenuated transfer ducts at every penetration of the acoustic envelope. Face velocity in the main runs can be relaxed to 3.5-4 m/s.

6. What HVAC specification applies to ABC and SBS broadcast recording booths?

Broadcast studios at ABC Ultimo Sydney, ABC Southbank Melbourne (Iwaki Auditorium), ABC Brisbane, ABC Adelaide, ABC Perth, ABC Hobart and SBS Artarmon Sydney target NC 20 absolute quiet, RT 60 of 0.4-0.8 seconds (much drier than a recital hall), and stable 22-24 deg C / 45-55%RH. The climate band must suit both ASHRAE TC 9.9 Class A1 broadcast equipment (mixing consoles, racks, server rooms) and human performers (voice-over actors, singers, instrumentalists). SBKJ supply ESD-safe galvanised duct from the SBAL-V line, with acoustic flex connectors, full-flow TDF flanged joints from the SBTF-1500/1602/2020 and triple-attenuated branch take-offs to keep self-noise below NR 15 at the microphone position.

7. Which SBKJ machine produces the fire-rated 250 deg C 2-hour stair pressurisation and zoned smoke duct required under AS 1668.1 and AS 1668.3?

The SBSF-1525 super-duty spiro line forms heavy-gauge galvanised round duct for stair pressurisation, smoke spill and zoned smoke control runs at AS 1668.1 leakage class A. The line handles 1.5-3.0 mm hot-dip galvanised at diameters from 250 mm to 1,500 mm. SBKJ pair this with the SBTF-1500/1602/2020 TDF-flange auto-line for rectangular smoke control duct, and the SB-ZF1500 plasma line cuts the flange/blank-off plates from 1.5-3.0 mm hot-dip galvanised sheet. All assemblies are independently NATA-witnessed and tested to AS 1530.4 250 deg C / 2 hour fire rating.

8. How are the Sydney Opera House heritage roof shells and concrete bases protected when threading new HVAC?

The Sydney Opera House is UNESCO World Heritage 2007 - any duct route must respect the Burra Charter and the SOH Conservation Management Plan signed off by the SOH Conservation Architect. SBKJ supply spiral round duct in 80-250 mm diameters threaded through existing services risers and the under-stage concrete labyrinth; no new penetration through Utzon's tile lid or board-formed concrete is permitted. Acoustic-lined duct uses the SBFB-1500 line with bead-roll air-tight seals and AS 4254 leakage class A. Every intervention is documented in a reversibility statement and lodged with the SOH Trust.

9. What sheet thickness and material do you specify for a ballet rehearsal hall such as The Australian Ballet Primrose Potter Australian Ballet Centre?

Dance studios run V_p at 12-15 L/s/dancer due to high metabolic load and sweat moisture release. SBKJ supply 0.8-1.2 mm hot-dip galvanised sheet on the SBAL-V auto duct line for the rectangular main supplies, and 0.8 mm spiral round on the SBFB-1500 for the perimeter throw. Stainless 316L 1.5 mm is reserved for the shower/change room and physiotherapy plunge-pool extract to handle chlorinated humid air. Acoustic target is NC 30 in the main studio, NC 25 in the smaller chamber studios used by the company's principals for solo rehearsal.

10. How does SBKJ verify Bizot Group climate envelope compliance for performing arts conservation labs and instrument stores?

The Bizot Group climate envelope - adopted by AICCM and the major Australian collecting institutions - allows 16-25 deg C and 40-60%RH with rate-of-change limits of 5%/24 hour. SBKJ supply purpose-built leakage class C duct on the SBAL-V auto duct line, with continuous TDF flange to AS 4254 from the SBTF-1500/1602/2020 line. Witnessed M&V uses calibrated tracer-gas decay (ASTM E741) and 30-day continuous temperature/RH data-logging to confirm seasonal stability across the Sydney/Melbourne/Brisbane/Adelaide/Perth ASHRAE 169 climate envelopes. Storage rooms holding Stradivarius, Steinway, Bosendorfer and heritage organ pipes get the tightest tolerance: less than 0.5 deg C deviation, less than 5%RH deviation, less than 1 deg C/hr and 5%RH/24hr rate-of-change.

SBKJ contact - ARBS 2026 Sydney May exhibitor