Sydney, Brisbane and Melbourne Wholesale Markets HVAC Duct Guide — Fruit, Vegetable, Flower, Seafood and Meat

The Australian wholesale market network in 2026

Australia runs six major wholesale market precincts on the mainland and two smaller operations in Tasmania and the Northern Territory. The two-million-tonne-plus annual produce throughput, the 13,000-tonne fish auction at Pyrmont, the integrated meat wholesale halls and the daily flower, plant, herb and specialty produce trade all sit inside building envelopes that are constantly being upgraded as the wholesale operators chase tighter cold chain, lower ethylene cross-contamination, tighter hazardous area compliance on ammonia refrigeration and better food court hospitality experience for the buyer, retailer and wholesale catering customer base. This guide consolidates the HVAC duct specification logic that runs across all six precincts.

Sydney Markets Limited (SML) at Flemington NSW is the biggest wholesale produce market in the southern hemisphere by tonnage. The site covers roughly 39 hectares with the central trading floor, the dedicated ripening room banks for banana, tomato and avocado, the flower auction hall, the wholesale meat hall, the dedicated wholesale Asian vegetable hall (the Sydney Markets Asian Wholesale section), and the supply yards and refrigerated truck staging for the Bidvest, Brambles, Coles, Woolworths, ALDI, IGA Metcash, independent retailer, restaurant and catering supply chain. The trading floor peak runs from 2 AM to 6 AM five mornings a week with a smaller Saturday session for the retail Growers Market. Roughly 2.5 million tonnes per year of fruit, vegetable, flower and limited seafood and meat product passes through the precinct.

Sydney Fish Markets at Pyrmont NSW is the biggest seafood market in the southern hemisphere by direct wholesale auction throughput. The heritage 1966 site is undergoing redevelopment with the new Sydney Fish Markets building due to integrate the wholesale auction hall, the Fish Auction System FAS digital bidding floor, the live fish wet market, the retail seafood stalls, the smoked and cooked fish operators, the sushi and sashimi preparation lines and the public food court and viewing gallery. Annual throughput sits around 13,000 tonnes covering tuna, snapper, bream, whiting, yellowtail kingfish, salmon, trout, crab, lobster, prawn, mussel, oyster, scallop, squid, octopus, calamari and crayfish, with the Sydney Fish Markets export licence handling Japan, Korea, USA and EU outbound tuna, salmon and yellowtail kingfish flows.

Brisbane Markets Limited (BML, ASX:BBL) at Rocklea QLD is the biggest wholesale market in Australia by area at roughly 77 hectares. The Rocklea precinct integrates the Brisbane Markets fruit and vegetable trading floor, the Brisbane Markets Fresh Centre, the Brisbane Markets Wholesale, the Brisbane Fish Markets and the Brisbane Pineapple Markets on a single site, with direct connection into the Bidvest, Brambles, Coles, Woolworths, ALDI, Metcash, Fresh Mart and FreshMaxx supply chain. Brisbane Markets Limited is the only ASX-listed wholesale market operator in Australia and the precinct is a benchmark for how a publicly-reported operator handles HVAC capital investment, refrigerant phase-down compliance and the National Construction Code Class 7b, Class 8 and Class 9b provisions across a single integrated wholesale site.

Melbourne Markets Limited (operating under the Melbourne Markets Authority MMA framework) at Epping VIC integrates the Melbourne Wholesale Fruit and Vegetable Market, the Melbourne Fish Market and the historical handoff with the Footscray Wholesale where the older Melbourne Fish Market in Footscray was decommissioned in favour of the consolidated Epping site and the Sydney Fish Markets supply for the Melbourne wholesale fish trade. The Footscray Fish Market continues to operate on a smaller scale, with the Maroubra Seafood, Pier 2 Fish Market, Australian Fresh, Fairfield Markets and Pier 2 Fresh operators servicing the broader Melbourne and New South Wales wholesale fish supply chain.

Adelaide Produce Markets at Pooraka SA covers the Adelaide Markets, the Pooraka Wholesale Markets and the connected Adelaide Central Market retail end, with the precinct supplying Coles, Woolworths, ALDI, Foodland (the South Australian independent supermarket co-operative), IGA Metcash, independent retailer, restaurant and Bidvest. Perth Markets Group at Canning Vale WA covers the Perth Wholesale Fruit and Vegetable Markets, the Perth Fish Markets, the Galati Market and the supply chain into ALDI, Coles, Woolworths, Foodland WA, independent retailer and restaurant. The smaller Hobart Markets Wholesale at Cambridge and the Salamanca Market end, and the Darwin Wholesale operation, complete the national network.

Sydney Markets wholesale produce HVAC — Flemington NSW

Sydney Markets Limited at Flemington is the reference operator for any Australian wholesale produce HVAC specification. The site runs a coordinated HVAC plant covering the main trading floor, the dedicated ripening rooms for banana, tomato and avocado, the wholesale Asian vegetable section, the flower auction hall, the wholesale meat hall, the central food court and a supporting plant room infrastructure for the ammonia refrigeration cold store, the make-up air handling units, the smoke spill ventilation, the building services hot water and the integrated dust and odour extract for the waste collection bays.

The main trading floor at Flemington is a NCC Class 9b assembly building with a peak occupancy load between 2 AM and 6 AM, five mornings a week. Buyer count peaks at roughly 3,500 to 4,500 wholesale buyers, retailer agents, restaurant operators and catering buyers moving through the trading floor, with another 1,500 to 2,000 forklift operators, market staff, security and cleaning crew on the floor at any time. The HVAC supply load is driven by occupancy, by the make-up air for the truck and forklift exhaust dilution, by the moisture and slush load from the vegetable display crates, and by the acoustic target of NC 45 in the trading floor envelope.

The Sydney Markets trading floor supply duct is fabricated from galvanised steel at 0.8 to 1.2 millimetre coil thickness on the SBAL-V auto duct line in the galvanised standard configuration. The trading floor is not classified as a hygienic food production zone under FSANZ 4.2.1 because the produce is in sealed cartons, plastic crates and bagged containers at the wholesale trading floor — the open-product hygiene requirements apply to the produce processing, packaging and dispatch sub-zones rather than to the trading floor itself. The supply trunk runs at 800 to 1500 mm diameter on the spiral round trunk and rectangular branch duct sized at the AS 1668.2 outdoor air rate of 8 to 10 litres per second per person occupancy load plus the truck and forklift dilution allowance.

The Sydney Markets ripening rooms — a dedicated bank serving the banana, tomato and avocado wholesale lines on the eastern side of the trading floor — are sealed climate-controlled rooms operating at 14 to 20 degrees Celsius and 85 to 95 percent relative humidity over a 3 to 5 day ripening cycle. The ripening room HVAC supply runs on a dedicated air handler with ethylene C2H4 dosing at 100 to 200 ppm and continuous ethylene monitoring. The room construction is sealed sandwich panel envelope with the duct penetrating the panel at sealed sleeves. Ventilation runs at 4 to 6 air changes per hour normal operation and switches to 20 to 30 ACH emergency purge if the ethylene monitor detects a leak above 1000 ppm (the safety threshold below the 2.7 percent volume in air lower flammability limit). The ripening room duct is 316L stainless at 1.2 millimetre with welded longitudinal seam to handle the high humidity condensate and the chloride from the produce.

The Sydney Markets flower auction hall on the western side of the precinct runs at 2 to 8 degrees Celsius and 80 to 95 percent relative humidity for the cut flower display. The hall is HVAC-segregated from the fruit and vegetable trading floor with a dedicated air handler running ethylene scrubbing on the make-up air through a potassium permanganate or activated carbon media bed. The supply ductwork is galvanised at 0.8 to 1.2 millimetre on the SBAL-V at galvanised, with low-velocity diffusion to protect the cut flower stems from petal damage and air-jet dehydration.

The Sydney Markets wholesale meat hall runs at minus 1 to plus 4 degrees Celsius for the chilled red meat, white meat and pork holding zone, with the connected freezer compartments at minus 18 degrees Celsius and IQF tunnel freezer compartments at minus 25 degrees Celsius for the bulk frozen and IQF processing. The hall is segregated into red meat (beef, lamb, goat, kangaroo, buffalo, alpaca, deer), white meat (chicken, duck, turkey, quail) and pork zones with separate ductwork systems and pressurisation cascades that hold the chilled holding zone positive to the receival and dispatch corridor. The duct is 316L stainless at 1.2 to 1.5 millimetre over the open carcass handling zones and galvanised at 0.8 to 1.2 millimetre over the dispatch corridor and the back-of-house plant room.

Sydney Fish Markets Pyrmont — the 316L stainless reference site

Sydney Fish Markets at Pyrmont is the most demanding HVAC environment in the Australian wholesale market sector. The combination of saltwater ice melt, fish water drainage, chlorinated and peracetic acid wash-down chemistry, the daily live fish tank operation, the fish auction floor between 2 AM and 5 AM, the wet market open display, the smoked and cooked fish lines, the sushi and sashimi preparation benches and the integrated food court and public viewing gallery creates a chloride-aggressive, humidity-saturated, proteinaceous aerosol-loaded duct environment that 304L stainless will not survive beyond five to seven years of operation.

The Sydney Fish Markets auction hall — the heritage 1966 building and the new redevelopment integrating the Fish Auction System FAS digital bidding floor — operates between 2 AM and 5 AM each weekday morning with the FAS Dutch auction descending price clock determining the wholesale prices for the day. The auction hall has roughly 700 to 1,100 wholesale fish buyers, retailer agents, restaurant operators, sushi and sashimi specialists and processed fish operators bidding live on the floor. The HVAC supply load is driven by occupancy at the AS 1668.2 outdoor air rate, by the make-up air for the forklift and tractor exhaust dilution, by the wash-down moisture load and by the acoustic target of NC 45 to NC 50 in the auction hall to allow the auction caller to be heard over the buyer chatter.

The auction hall supply duct is 316L stainless at 1.2 to 1.5 millimetre fabricated on the SBAL-V at 316L variant. The duct is welded longitudinal seam (SBSF-1525 stitchwelder or SB-ZF1500 continuous TIG stitchwelder) where it passes over the open fish display crates and the buyer corridor. Round spiral trunk is 1000 to 2020 mm diameter on the SBTF-2020 spiral tubeformer for the larger sections feeding the air handler discharge into the hall. The hall is held at slight positive pressure relative to the loading dock and the back-of-house fish handling to prevent ambient diesel exhaust and tractor fumes drifting onto the open fish product.

The wet market and retail fish display lines at Sydney Fish Markets operate seven days a week with the open ice-bed fish display, the live fish tank wall and the touch-and-taste retail interface for the public visitor. The wet market HVAC is held at slight positive pressure to the public viewing corridor and slight negative pressure relative to the auction hall. The wet market duct is 316L stainless at 1.2 millimetre throughout with welded longitudinal seam, hygienic finish on internal surfaces, V-groove drip-tray construction on horizontal runs, and removable cleaning access at 3 metre intervals. The daily wash-down cycle at the wet market uses chlorinated water at 0.5 mg per litre free chlorine and peracetic acid at 0.4 ppm STEL workplace exposure standard — the 316L molybdenum addition is what keeps the duct from pitting at the daily chloride exposure.

The smoked fish and cooked fish processing lines at Sydney Fish Markets — serving the wholesale supply of hot-smoked salmon, cold-smoked salmon, smoked trout, smoked mackerel, cooked prawn, cooked crab, cooked lobster, hot-and-cooked tuna and the heritage cooked fish operators — require dedicated smoke discharge chimney construction. The hot-smoke kiln chimney is 309 stainless on the inner liner (the higher chromium and nickel content withstands the 80 to 90 degrees Celsius chimney temperature and the creosote condensate) with 304 stainless on the outer skin, uninsulated on the inner liner to allow the tar and creosote condensate to drain back to the smoke generator, sloped at 30 degrees minimum on horizontal runs, with removable cleaning panels at 3 metre intervals for the weekly tar removal cycle and integrated wet chemical or water mist fire suppression under AS 1851. SBKJ supplies the smoking kiln chimney using the SB-ZF1500 stitchwelder for continuous TIG seam construction and the SBPC1500 plasma cutter for stack flange preparation.

The sushi and sashimi preparation benches at Sydney Fish Markets — serving the wholesale supply of skin-on fillet, skinless fillet, sashimi blocks, nigiri-grade portion and the various Japanese-style preparation that the wholesale and restaurant supply chain requires — operate at 4 to 8 degrees Celsius chilled benchroom with very tight humidity control at 70 to 80 percent and HEPA-filtered supply air at H13 efficiency to manage airborne bacterial load. The bench room is a separate HVAC climate zone, segregated from the open auction hall and the wet market, held at slight positive pressure relative to both, with the duct in 316L stainless at 1.2 millimetre, welded longitudinal seam, passivated to ASTM A967, and integrated with the bench overhead capture hood at 0.5 metre per second capture velocity to remove the fishy aerosol from the operator breathing zone.

The live fish tank wall and the crab, lobster, prawn, oyster and scallop holding tanks at Sydney Fish Markets are held in dedicated recirculating saltwater systems with biological filtration, mechanical filtration, ozone or UV sterilisation, oxygenation and degassing stages. The fish house atmosphere above the holding tanks accumulates evaporated saltwater chloride, traces of ammonia from the fish biomass and dissolved CO2. The HVAC duct response is dedicated 316L stainless overhead extract at 6 to 12 ACH, capture hoods at 0.3 to 0.5 metres per second capture velocity over each tank, and integration with the building exhaust under AS 1668.2 with discharge stack rising 1.5 metres above the highest occupied roof.

Brisbane Markets Rocklea — the integrated wholesale precinct

Brisbane Markets Limited (ASX:BBL) at Rocklea QLD is Australia's biggest wholesale market by area at roughly 77 hectares, integrating the Brisbane Markets fruit and vegetable trading floor, the Brisbane Markets Fresh Centre, the Brisbane Markets Wholesale, the Brisbane Fish Markets and the Brisbane Pineapple Markets on a single site. The Rocklea precinct serves Bidvest, Brambles, Coles, Woolworths, ALDI, Metcash, Fresh Mart and FreshMaxx through a coordinated cold chain that runs from the producer gate through the auction floor through the cold store and out to the retail and catering destination.

The Brisbane Markets fruit and vegetable trading floor is a NCC Class 9b assembly building with a peak occupancy load between 3 AM and 7 AM (the Brisbane trading floor runs slightly later than the Sydney Markets peak because of the Queensland time zone and the inbound truck arrival pattern from the Lockyer Valley, the Bundaberg sugar coast and the Far North Queensland banana belt). The supply duct is galvanised at 0.8 to 1.2 millimetre on the SBAL-V at galvanised standard. The Brisbane site adds additional ventilation capacity for the tropical heat load — Brisbane summer ambient hits 32 to 38 degrees Celsius with very high relative humidity, and the trading floor air handler runs roughly 30 to 50 percent more cooling capacity per square metre than the Sydney Markets equivalent.

The Brisbane Markets Fresh Centre is the dedicated fresh produce packing, grading and value-add zone at Rocklea where the supply chain Bidvest, Brambles, Coles, Woolworths, ALDI and Metcash operators run their grading lines, salad mix packing, ready-to-eat fruit pack, banana ripening, avocado ripening and the various pre-pack operations. The Fresh Centre HVAC is FSANZ 4.2.1 spec with 316L stainless ductwork over the open product zones and pressurisation cascade running clean (final pack) to dirty (waste collection) at 25 Pa positive cascade. The ripening room cluster at the Fresh Centre includes a 6-room banana ripening bank, a 4-room avocado ripening bank, a 2-room tomato ripening bank and a 2-room stone fruit ripening bank, all running ethylene C2H4 dosing at 100 to 200 ppm with continuous monitoring and emergency purge under the Class I Zone 2 hazardous area construction (where ethylene concentration justifies the classification).

The Brisbane Fish Markets at Rocklea operates a smaller wholesale fish auction than Sydney Fish Markets but services the entire Queensland wholesale seafood supply chain — the Far North Queensland prawn fishery, the Spencer Gulf wild prawn boats unloading at the Brisbane wholesale terminal, the Coral Sea reef line tuna, the Moreton Bay bay prawn fishery and the various Queensland aquaculture operations. The auction hall is 316L stainless duct at 1.2 to 1.5 millimetre, welded longitudinal seam, with the same hygienic finish, V-groove drip-tray construction and overhead capture velocity targets as the Sydney Fish Markets specification.

The Brisbane Pineapple Markets at Rocklea is a unique Australian wholesale market segment dedicated to the Queensland pineapple, papaya, mango, lychee, rambutan, dragon fruit and the broader tropical fruit category. The pineapple holding floor operates at 8 to 12 degrees Celsius and 85 to 95 percent relative humidity to extend the shelf life of the harvested fruit. The HVAC duct is galvanised at 0.8 to 1.2 millimetre over the dry receival corridor and 316L stainless at 1.2 millimetre over the open display and grading floor. The ethylene exposure for the pineapple and mango lines is managed by separate climate zoning rather than active scrubbing because pineapple and mango are non-climacteric in the wholesale handling context.

The Brisbane Markets cold store and IQF tunnel freezer plant serving the chilled vegetable, chilled meat, frozen seafood and ice plant duty is the biggest single hazardous area HVAC envelope on the Rocklea site. The plant room runs R-717 ammonia at industrial scale and the AS/NZS 60079.10.1 Class I Zone 2 classification applies. The duct construction is 316L stainless with bonded conductive joints, IECEx Ex e or Ex d marked motor and damper actuator, continuous ammonia detection with low alarm at 15 ppm and high shutdown at 25 ppm 8-hour TWA, emergency ventilation at 30 ACH minimum under AS/NZS 1677 and AS/NZS 5149, dedicated emergency vent stack discharging 3 metres above the highest occupied roof, drain trap interlock to prevent ammonia migration through floor wastes, and AS 4775 emergency eyewash and shower stations at every plant room exit. Brisbane Markets Limited as the ASX-listed operator is the Australian benchmark for how a publicly-reported wholesale market handles the ammonia hazardous area compliance dossier — the annual safety review and the ASX continuous disclosure regime keep the operator on the leading edge of refrigerant safety practice.

Melbourne Markets Limited Epping VIC

Melbourne Markets Limited (operating under the Melbourne Markets Authority MMA framework) at Epping VIC was relocated from the heritage Footscray site to the current Epping precinct in 2015. The Epping site is a purpose-built integrated wholesale market with the Melbourne Wholesale Fruit and Vegetable Market on the main trading floor, the connected meat wholesale hall, the flower auction hall, the food court and the supporting cold store and IQF tunnel freezer plant. The Melbourne Fish Market at Footscray was decommissioned in favour of the Footscray Fish Market operation on a smaller scale, with the bulk of the Melbourne wholesale fish supply coming through the Sydney Fish Markets supply chain and the direct producer-to-wholesale interface with the Tasmanian salmon operators (Tassal, Huon, Petuna) and the various Bass Strait and Southern Ocean wild fishery operators.

The Melbourne Markets Epping trading floor is a NCC Class 9b assembly building with a peak occupancy between 4 AM and 8 AM (the Melbourne trading floor runs the latest of the three eastern seaboard wholesale markets because of the Victorian time zone and the inbound truck arrival pattern from the Goulburn Valley, the Mornington Peninsula and the Northern Victoria stone fruit and apple belt). The HVAC supply is sized for the peak occupancy of roughly 2,500 to 3,500 wholesale buyers, retailer agents, restaurant operators and catering buyers, plus 1,000 to 1,500 forklift operators, market staff, security and cleaning crew.

The Melbourne Markets ethylene ripening room cluster at Epping includes a 4-room banana ripening bank, a 3-room avocado ripening bank, a 2-room tomato ripening bank and a 2-room stone fruit ripening bank. The same ethylene dosing protocol applies (100 to 200 ppm C2H4 with continuous monitoring and emergency purge) and the Class I Zone 2 hazardous area construction applies where the operating concentration justifies it. The Melbourne Markets ripening rooms have been a recent capital investment programme for the MMA, with substantial upgrade in the 2024-2025 capital programme to integrate digital climate monitoring, IoT-connected ethylene sensors and remote monitoring from the MMA control room.

The Melbourne Markets flower auction at Epping is the southern-state benchmark for the cut flower wholesale operation. The flower hall runs at 2 to 8 degrees Celsius and 80 to 95 percent relative humidity with potassium permanganate or activated carbon ethylene scrubbing on the make-up air. The Melbourne cut flower supply chain serves the Melbourne metropolitan florist network, the regional Victorian florist supply and the interstate flower distribution to South Australia, Tasmania and southern New South Wales. The HVAC duct is galvanised at 0.8 to 1.2 millimetre on the SBAL-V at galvanised, with low-velocity diffusion through laminar flow ceiling diffusers to protect the cut flower stems. The Melbourne Markets flower hall is also the only one of the eastern seaboard wholesale flower halls that runs a separate native flora climate zone — the Victorian and South Australian native flora wholesale (banksia, kangaroo paw, waratah, grevillea, native daisy and the broader Australian native cut flower segment) requires slightly different humidity and temperature targets than the imported rose, lily and chrysanthemum line.

The Melbourne Markets meat wholesale hall at Epping is a NCC Class 7b food storage classification with the same chilled holding at minus 1 to plus 4 degrees Celsius and the connected freezer compartments at minus 18 degrees Celsius and IQF tunnel freezer at minus 25 degrees Celsius as the Sydney Markets meat hall. The Melbourne hall handles the broader range of red meat, white meat and exotic meat (kangaroo, buffalo, alpaca, deer, goat) flowing through the Victorian and South Australian abattoir network into the Melbourne metropolitan retail, catering and restaurant supply chain.

The Footscray Fish Market continues to operate on a smaller scale than the original Melbourne Fish Market, with the daily wholesale and retail fish supply for the Melbourne western suburbs and the broader Footscray and inner-west catering and restaurant market. The Footscray site is 316L stainless duct at 1.2 millimetre throughout the wholesale and retail fish display zones, with welded longitudinal seam and the same hygienic finish, V-groove drip-tray construction and overhead capture velocity targets as the Sydney Fish Markets specification.

Ammonia cold store Class I Zone 2 — the killer compliance point

Every major wholesale market in Australia — Sydney Markets, Sydney Fish Markets, Brisbane Markets, Brisbane Fish Markets, Melbourne Markets, Adelaide Pooraka, Perth Canning Vale — runs R-717 ammonia refrigeration at industrial scale for the chilled vegetable, chilled meat, frozen meat, frozen seafood, ice plant and IQF tunnel freezer duties. Ammonia is the most thermodynamically efficient industrial refrigerant on the planet, with a coefficient of performance roughly 20 to 30 percent above the HFC alternatives, and it has zero ozone depletion and zero direct global warming potential. The catch is that ammonia at sufficient concentration is flammable (lower flammability limit 15 percent volume in air, upper flammability limit 28 percent volume in air) and acutely toxic (Safe Work Australia workplace exposure standard 25 ppm 8-hour TWA, 35 ppm 15-minute STEL, IDLH 300 ppm).

AS/NZS 60079.10.1 classifies the ammonia compressor room as Class I Zone 2 hazardous area — the location where ammonia release in normal operation is not expected, but where a credible fault scenario could produce a flammable atmosphere for a short period. The duct construction inside the Zone 2 envelope has six interlocking compliance requirements that every wholesale market operator audits annually.

First, the duct material is 316L stainless steel with bonded conductive joints. Every transverse and longitudinal seam has to maintain electrical continuity so that any static charge generated by ammonia vapour movement through the duct cannot accumulate to a discharge potential. The bonded joints are achieved by welded seam (SBSF-1525 stitchwelder or SB-ZF1500 continuous TIG stitchwelder) with overlapped continuous bond, or by mechanical seam with explicit bonding strap and verified resistance below 1 ohm across each joint. SBKJ supplies the ammonia plant room ductwork with verified bonded joints and an end-to-end resistance certificate as part of the FAT documentation.

Second, every motor, damper actuator, sensor and control device inside the Zone 2 envelope is IECEx Ex e (increased safety) or Ex d (flameproof enclosure) construction. The IECEx certificate is held on file for every device and re-verified at every annual safety review. SBKJ specifies the IECEx range from major Australian and European OEM suppliers and integrates them into the duct supply package.

Third, continuous ammonia detection is fitted at multiple points in the plant room and in the duct extract. The low-level alarm triggers at 15 ppm (below the WES) to give the operator early warning, and the high-level shutdown triggers at 25 ppm 8-hour TWA to initiate the emergency response. The detection is typically electrochemical sensor with infrared backup, and the system is interlocked with the emergency ventilation, the plant shutdown and the building fire alarm.

Fourth, emergency ventilation runs at 30 air changes per hour minimum under AS/NZS 1677 and AS/NZS 5149. The normal ventilation rate sits at 1 to 3 ACH for routine dilution, and the system steps up to 30 ACH on detection of an ammonia release. The emergency vent stack discharges 3 metres minimum above the highest occupied roof and 5 metres minimum from any operable window, air intake or building opening. The vent fan is IECEx Ex e construction with redundant power supply.

Fifth, drain trap interlock prevents ammonia migration through floor wastes into adjacent occupied zones. Every floor waste in the plant room has a deep seal trap and an interlock that closes the drain isolation valve on ammonia detection. The interlock is integrated with the building fire alarm and the plant shutdown sequence.

Sixth, AS 4775 emergency eyewash and shower stations are fitted at every plant room exit and at every operator station inside the plant room. The eyewash and shower lines are tempered water at 16 to 38 degrees Celsius to allow 15-minute continuous flushing without thermal shock, and the lines are tested weekly under AS 1851 maintenance.

The wholesale market sector is also progressively transitioning from R-717 ammonia to R-744 carbon dioxide transcritical refrigeration on the smaller cold store and IQF tunnel duty under the global HFC phase-down framework. Sydney Fish Markets and Brisbane Markets have both invested in R-744 CO2 transcritical plant on the newer cold store cells. R-744 is non-flammable, non-toxic and has a global warming potential of 1 (the reference for the GWP scale), but it operates at very high pressure (typical transcritical discharge pressure 90 to 100 bar) which drives the duct and pipe specification differently. The R-744 plant room is not classified as a hazardous area for flammability, but the high-pressure release scenario drives the relief vent design and the duct discharge sizing.

Ethylene ripening room — banana, tomato, avocado, stone fruit

Banana, tomato, avocado, stone fruit (peach, nectarine, plum, apricot) and a small range of other climacteric crops are deliberately ripened post-harvest in dedicated ethylene rooms at the wholesale market. The ripening room is sealed, dosed with ethylene C2H4 gas at 100 to 200 ppm depending on crop and protocol, and held at controlled temperature (14 to 20 degrees Celsius depending on crop) and high relative humidity (85 to 95 percent) over a 3 to 5 day ripening cycle. The result is a uniform ripening of the harvested fruit so that the retail and catering customer receives a consistent ready-to-eat product.

Sydney Markets Limited runs a dedicated ripening room bank on the eastern side of the Flemington precinct with separate banana, tomato, avocado and stone fruit room clusters. Brisbane Markets Limited runs the integrated ripening room cluster at the Brisbane Markets Fresh Centre. Melbourne Markets Limited runs the consolidated ripening cluster on the eastern side of the Epping site. The Adelaide Pooraka and Perth Canning Vale sites both run smaller ripening room banks scaled to the South Australian and Western Australian wholesale market throughput.

The ripening room HVAC has four engineering challenges. The first is the ethylene dosing system. The ethylene gas is dosed from a pressurised cylinder bank or from an on-site ethylene generator (catalytic conversion of ethanol to ethylene) at a controlled rate to maintain the 100 to 200 ppm operating concentration. The dosing system is interlocked with the room ventilation, the temperature control and the humidity control, with continuous ethylene monitoring and emergency purge if the concentration drifts above the safety threshold.

The second is the hazardous area classification. Ethylene is flammable with lower flammability limit 2.7 percent volume in air (27,000 ppm). The operating concentration at 100 to 200 ppm is well below the LFL, but the dosing cylinder vault and the dosing system is engineered as Class I Zone 2 hazardous area where the operating concentration could exceed the safety threshold under fault conditions. The room itself is typically not classified as hazardous area at the 100 to 200 ppm operating concentration but the operator runs continuous ethylene monitoring at 1000 ppm alarm threshold and emergency purge at 20 to 30 ACH on detection.

The third is the cross-contamination control. Ripening fruit naturally produces ethylene as a metabolic by-product, and the ambient ethylene drift from a ripening room into the adjacent open wholesale floor will cross-ripen the ethylene-sensitive flowers, leafy greens, broccoli, lettuce and stone fruit kept beyond the ripening room. The wholesale market response is dedicated extract ductwork on each ripening room discharging to atmosphere through a dedicated stack, separate climate zoning between the ripening room cluster and the flower auction hall, and physical separation between the ripening cluster and the leafy green and stone fruit holding zones.

The fourth is the high humidity duct construction. The ripening room runs 85 to 95 percent relative humidity, and the duct envelope is constantly wet on the internal surfaces. The construction is 316L stainless at 1.2 millimetre with welded longitudinal seam, hygienic finish on internal surfaces, V-groove drip-tray on horizontal runs, and condensate drainage to dedicated drain points. The duct insulation is external closed-cell foam with vapour barrier to prevent condensation on the cool exterior.

SBKJ supplies the ripening room ductwork using the SBAL-V at 316L variant for the rectangular branch duct and the SBFB-1500 spiral tubeformer for the round trunk. The ethylene dosing cylinder vault duct is fabricated with bonded conductive joints, IECEx Ex e construction on the dosing valve actuator, and integrated with the continuous ethylene detection.

316L stainless fish market wash-down — the chloride reference

The wholesale fish market wash-down environment is the most chloride-aggressive environment in the Australian food industry. The Sydney Fish Markets daily wash-down cycle uses chlorinated water at 0.5 mg per litre free chlorine for the floor and bench sanitation, peracetic acid at 0.4 ppm STEL workplace exposure standard for the equipment sanitation cycle, and chlorine dioxide ClO2 at 0.1 ppm STEL for the live tank biofilm control. The wash-down chemistry continually exposes the overhead ductwork to chloride aerosol drift, and standard 304L austenitic stainless steel will develop chloride pitting and stress-corrosion cracking within five to seven years of operation.

316L austenitic stainless steel is the AS/NZS 4674 and FSANZ 4.2.1 default for wholesale fish market ductwork. The 2 to 3 percent molybdenum addition is what confers the chloride pitting resistance. The 316L specification is tighter than the standard architectural 316 grade — the low-carbon variant (below 0.03 percent C) is required to prevent chromium carbide precipitation at the welded seam, which would otherwise create a sensitised zone that pits preferentially in the chloride environment.

SBKJ runs 316L at 1.2 to 1.5 millimetre on every wholesale fish market duct line we ship. The 1.2 millimetre band is the standard for the rectangular branch duct on the SBAL-V at 316L variant. The 1.5 millimetre band is used for the larger spiral trunk and for the chimney and exhaust riser sections. The mill certificate is verified at coil receipt against ASTM A240 or EN 10088-2 with the molybdenum content at 2.0 to 3.0 percent weight and the carbon below 0.03 percent.

The internal hygienic finish is the critical fabrication quality metric on every wholesale fish market duct piece. The deburr step removes any sheet edge burr that would otherwise become a Listeria reservoir. The internal weld grind smooths every weld to a continuous radius without sharp corners or crevices. The passivation step uses citric acid (30 to 40 percent solution at 50 to 70 degrees Celsius for 4 hours) or nitric acid (20 to 40 percent solution at ambient for 30 minutes) per ASTM A967 to restore the chromium oxide layer that confers the corrosion resistance. The verification step is a ferroxyl test (potassium ferricyanide and sodium chloride solution) that detects any iron contamination on the passivated surface.

V-groove drip-tray construction on horizontal duct runs above open product zones is the standard FSANZ 4.2.1 detail to manage condensate. The bottom of the duct is fabricated with a V-groove profile that captures the condensate and routes it to a dedicated drain point at the low end of the run, rather than allowing the condensate to drip onto the open fish, meat, fruit, vegetable or flower product. The drain point connects to a tundish with air gap to the floor drain to prevent any back-flow from the building drainage into the duct envelope.

Removable cleaning access at 3 metre intervals along production-zone duct runs is the FSANZ 4.2.1 and AS/NZS 4674 detail for hygienic ductwork. The cleaning access is a hinged panel with food-grade gasket seal, sized to allow operator entry for inspection and manual cleaning, located on the side of the duct rather than the bottom to prevent any panel falling onto product, and accessible from an AS 1657 compliant walkway or platform for the maintenance crew.

Wholesale meat cold chain — red meat, white meat, pork, exotic

The Australian wholesale meat operation at Sydney Markets, Brisbane Markets, Melbourne Markets, Adelaide Pooraka and Perth Canning Vale integrates the red meat, white meat, pork and exotic meat categories through chilled and frozen holding into the retail, catering and restaurant supply chain. AS 4696 (the Australian Standard for the hygienic production and transportation of meat and meat products for human consumption) and AS 4326 (the Australian Standard for the transport of meat and meat products) frame the cold chain HACCP requirements that the wholesale meat hall has to meet.

The chilled holding zone operates at minus 1 to plus 4 degrees Celsius for the red meat, white meat and pork primal cuts and the smaller fabrication portion. The connected freezer compartments operate at minus 18 degrees Celsius and below for the bulk frozen meat and the export-licensed frozen product. The IQF tunnel freezer compartments operate at minus 25 to minus 30 degrees Celsius for the individually quick frozen poultry, mince and small-portion product.

The red meat segment integrates beef (the dominant single category by volume), lamb (with the substantial Australian sheep meat industry channel), goat (the rising export-focus category serving the Middle East and South-East Asia destinations), kangaroo (the unique Australian game meat category), buffalo (the smaller Northern Territory and Queensland buffalo industry), alpaca (the boutique South Australian and Victorian segment) and deer (the boutique New Zealand-style venison segment from Australian deer farms). The wholesale meat hall handles all these categories through separate or shared chilled holding compartments depending on the operator and the throughput.

The white meat segment integrates chicken (the dominant single category by volume across the broader poultry industry), duck (the Pekin duck, Muscovy duck and the boutique heritage breed segment), turkey (the seasonal Christmas peak and the year-round catering supply), and quail (the boutique restaurant supply category). The wholesale poultry handling is FSANZ 4.2.4 zoonotic risk management with strict Salmonella and Campylobacter cross-contamination control between the raw poultry handling and the cooked-product preparation zones.

The pork segment integrates fresh pork primal, smoked bacon, ham, sausage and the various small-good processing. The wholesale pork is held in separate compartments from the red meat and white meat to manage cross-contamination risk and to accommodate the halal and kosher certification programmes that apply to the broader meat wholesale supply chain.

The HVAC duct response for the wholesale meat hall is 316L stainless at 1.2 to 1.5 millimetre over the open carcass and primal handling zones, with welded longitudinal seam (SBSF-1525 or SB-ZF1500), hygienic finish on internal surfaces, V-groove drip-tray on horizontal runs and removable cleaning access at 3 metre intervals. The dispatch corridor, the back-of-house plant room and the office HVAC supply is galvanised at 0.8 to 1.2 millimetre on the SBAL-V at galvanised standard or the SBAL-III at galvanised for the smaller branch duct.

The pressurisation cascade holds the chilled holding zone at plus 5 to plus 10 Pa positive to the receival and dispatch corridor, which in turn is held positive to the loading dock. The carcass dressing and offal collection zones are held negative to the chilled holding to prevent any odour or aerosol drift onto the open meat surface.

The defrost cycle moisture management is a critical detail in the wholesale meat hall HVAC. The chilled holding zone evaporator coils run an automatic defrost cycle every 4 to 8 hours to remove the ice accumulation. The defrost generates substantial moisture release into the duct envelope, and the duct fall and drip-tray layout has to keep the defrost condensate off the open meat product surface at all times. SBKJ specifies the duct fall at 1 in 100 minimum on horizontal runs above the meat product, with the drain point located outside the open product zone and a deep seal trap at the drain point.

Halal and kosher certification under the Australian Halal Certification Body (AHCB) and Kosher Australia adds further audit scrutiny on the wholesale meat hall HVAC. The certified operator has to demonstrate physical separation between halal-certified and non-certified slaughter lines, with separate ductwork systems if the operator handles both certified and non-certified product. The wholesale meat hall HVAC is typically zoned to allow either complete halal segregation or shared halal-and-conventional operation depending on the operator's certification scope.

Adelaide, Perth, Hobart and Darwin wholesale operations

Adelaide Produce Markets at Pooraka SA covers the Adelaide Markets, the Pooraka Wholesale Markets and the connected Adelaide Central Market retail end. The Pooraka site is a NCC Class 9b assembly building with the main trading floor, the ripening room cluster, the wholesale meat hall, the flower auction and a smaller fish wholesale operation. The supply chain serves Coles, Woolworths, ALDI, Foodland (the South Australian independent supermarket co-operative), IGA Metcash, independent retailer, restaurant and Bidvest. The HVAC duct on the Pooraka trading floor is galvanised at 0.8 to 1.2 millimetre on the SBAL-V at galvanised, with the same 316L stainless construction over the open fish, meat and produce processing sub-zones as the eastern seaboard markets.

Perth Markets Group at Canning Vale WA covers the Perth Wholesale Fruit and Vegetable Markets, the Perth Fish Markets, the Galati Market and the supply chain into ALDI, Coles, Woolworths, Foodland WA, independent retailer and restaurant. The Canning Vale site is the only major Australian wholesale market on the Western Australian side of the Nullarbor, and the freight logistics into and out of the precinct run via the Trans-Australian Railway, the Eyre Highway road train route and the Fremantle Port for the imported produce. The Perth Markets HVAC is designed for the WA summer heat load (Perth summer peaks at 38 to 42 degrees Celsius dry bulb) with substantial cooling capacity on the trading floor air handler.

The Galati Market at Canning Vale is the dedicated Italian and Mediterranean specialty produce wholesale operation servicing the Perth metropolitan restaurant, deli and specialty retail segment. The Galati operation handles olive, olive oil, cured meat, specialty cheese, dried fruit and the broader Mediterranean specialty range, with FSANZ 4.2.1 spec ductwork over the open product handling zones and AS/NZS 4674 food premises construction throughout.

Hobart Markets Wholesale at Cambridge TAS and the Salamanca Market end at the historic Salamanca Place precinct cover the Tasmanian wholesale produce, the Tasmanian fish supply (interfacing with the Tassal, Huon and Petuna salmon operators and the broader Bass Strait and Southern Ocean wild fishery), and the connected Salamanca retail market on the weekend. The HVAC scope is smaller than the mainland markets but the FSANZ 4.2.1 and AS/NZS 4674 spec applies to the same standards.

Darwin Wholesale operates on a limited scale serving the Northern Territory wholesale produce and fish supply for the Darwin metropolitan retail and catering market. The HVAC scope is the smallest of the Australian wholesale market network, but the tropical climate (Darwin runs 25 to 35 degrees Celsius year-round with very high relative humidity) drives substantial cooling and dehumidification capacity into the trading floor HVAC system.

Commercial kitchen, food court and catering HVAC

Sydney Fish Markets at Pyrmont, the Sydney Markets Hub at Flemington, the Brisbane Markets at Rocklea and the Melbourne Markets at Epping all operate food court, cafe, restaurant and catering kitchen tenancies on the public-facing side of the wholesale precinct. The food court HVAC integrates with the broader wholesale market system but runs its own dedicated grease-bearing exhaust, make-up air, fire suppression and acoustic management envelope.

FSANZ 3.2.2 covers food safety practices and 3.2.3 covers food premises construction for the food court and restaurant tenancies. NFPA 96 covers the commercial kitchen grease-bearing exhaust where it applies — the standard is referenced widely in Australia although AS 1851 maintenance and the building's deemed-to-satisfy provisions in the National Construction Code take statutory precedence under Australian law.

The duct construction for grease-bearing exhaust from the food court woks, grills, deep fryers and char-broilers is 1.6 millimetre minimum black steel or 1.2 millimetre minimum 304 or 316 stainless welded continuously, with internal access at every 3 metre interval for grease cleaning, slope at 2 percent minimum back to a collection point at the cooking equipment end, UL 300 or equivalent fire suppression nozzle integration on the wet chemical system, and make-up air at 80 to 90 percent of the extract rate to maintain pressurisation cascade and prevent grease-laden smoke migration into the public retail zone.

SBKJ supplies the grease-bearing exhaust trunk using the SB-ZF1500 continuous TIG stitchwelder for the welded longitudinal seam and the SBPC1500 plasma cutter for the access panel and flange preparation. The continuous TIG seam is the AS 1668.1 deemed-to-satisfy construction for the grease exhaust riser and the discharge stack.

The Sydney Fish Markets public food court is a sensitive acoustic environment because of the open viewing gallery and the public visitor experience. The food court HVAC is designed to NC 35 acoustic target with internal duct lining, low-velocity diffusion through laminar flow ceiling diffusers and integrated acoustic attenuators on the supply and extract trunks. The Brisbane and Melbourne markets food courts run NC 40 acoustic target on the open public area and NC 45 on the back-of-house preparation zones.

Vehicle loading, refrigerated freight and cold chain logistics

The wholesale market vehicle loading dock and refrigerated freight envelope is a substantial HVAC scope item in its own right. Each major wholesale market handles 1,500 to 3,500 vehicle movements per day at peak, with the inbound producer truck arrival pattern between 6 PM and 2 AM each day, the trading floor peak between 2 AM and 8 AM, and the outbound retailer, catering and restaurant truck despatch between 6 AM and 12 noon. The vehicle movement includes B-Double semitrailer, road train (in the inbound from the Far North Queensland banana belt and the South Australian and Victorian stone fruit belt), refrigerated container, refrigerated chilled cold chain van and the various smaller delivery vehicles.

The vehicle exhaust load is substantial. Diesel exhaust at the loading dock generates NOx, CO, PM2.5 and the broader diesel particulate matter. The Safe Work Australia workplace exposure standards for the constituent gases — CO at 30 ppm 8-hour TWA, NO2 at 0.2 ppm 15-minute STEL, diesel particulate matter at 0.1 mg per cubic metre elemental carbon — drive the loading dock ventilation rate.

The LPG forklift is the dominant material handling equipment on the wholesale market trading floor. The LPG exhaust generates CO at substantial concentration if the engine is not properly tuned, and any LPG leak in the storage area creates a Class I Zone 2 hazardous area envelope. The trading floor ventilation has to provide CO dilution and emergency purge capability for the LPG release scenario. The electric forklift segment has grown substantially in the last decade as the wholesale market operators have invested in battery-electric and lithium-ion forklift fleet, reducing the CO and LPG hazard but adding the lithium-ion battery thermal event hazard.

The loading dock vehicle wash, the tyre dust collection and the dock area street cleaning generate additional ventilation load. The wash-down sprays use chlorinated water at 0.5 mg per litre free chlorine, and the dock area floor drainage is integrated with the broader site waste-water treatment system. SBKJ supplies the loading dock ventilation ductwork using the SBAL-III at galvanised standard for the supply duct and the SBAL-V at 316L for any sections exposed to chloride aerosol from the wash-down spray.

The refrigerated freight cold chain is the connecting tissue of the wholesale market network. Linfox, Toll Group, ANL, Aurizon (ASX:AZJ) rail, Pacific National rail, B-Double semi-trailer, road train and refrigerated cold chain Spirit of Tasmania ferry connect the wholesale markets with the producer source, the retail destination and the export licensed despatch terminal. The refrigerated container handling at the dock requires close coordination between the vehicle refrigeration unit, the dock seal and the cold store loading bay HVAC to maintain the cold chain temperature integrity.

Ice plant, slush ice and ice make-up

Every major wholesale fish market and a substantial portion of the wholesale produce market operations run a dedicated ice plant for the daily ice supply. Sydney Fish Markets at Pyrmont, Brisbane Fish Markets at Rocklea and the Footscray Fish Market all operate dedicated ice flake and tube ice plant on the wholesale market site, with the daily ice production feeding the fish auction display, the wet market retail display, the live fish tank top-up and the wholesale fish despatch box icing. The Sydney Markets, Brisbane Markets and Melbourne Markets all operate smaller ice production capacity for the wholesale fish, the wholesale meat and the cold chain top-up.

The ice plant refrigeration is R-717 ammonia or R-744 CO2 transcritical at the larger operations and R-454B or R-32 on the smaller plant. The ice flake and tube ice production runs at minus 18 to minus 25 degrees Celsius on the ice maker drum or the tube freezer, with the ice harvested into a refrigerated ice storage bin at minus 5 to minus 10 degrees Celsius. The ice plant ventilation is integrated with the broader refrigeration plant room ventilation under AS/NZS 1677 and AS/NZS 5149.

The slush ice make-up for the live fish tank and the retail display is a chlorinated water and ice mix at 0.5 mg per litre free chlorine, with the ice flake or tube ice melted in the chlorinated water to produce the slush ice that maintains the fish at the ice-bed temperature. The slush ice production area is a chloride-aggressive HVAC environment requiring 316L stainless duct construction over the open production zone.

Vegetable, fruit trim, peeling and juicing

The wholesale market value-add operations include vegetable and fruit trimming, peeling, slicing, juicing, crushing and the broader pre-pack and ready-to-eat preparation. The Bidvest, Brambles, Coles, Woolworths, ALDI and Metcash cold chain processing operators run substantial pre-pack lines at the wholesale market site, including the salad mix packing, the ready-to-eat fruit pack, the vegetable juice production and the various pre-cut vegetable lines.

The trim, peel and juice operations generate substantial food waste and acid waste with ethylene release from the over-ripe fruit. The wastewater treatment integrates with the broader site waste-water management system, and the HVAC ductwork over the open trim and juice zone is 316L stainless at 1.2 millimetre with welded longitudinal seam to handle the high humidity and the chloride from the produce.

The pre-pack and ready-to-eat preparation operates under FSANZ 4.2.1 hygiene and 4.2.2 microbial control, with HACCP critical control points on the temperature management, the wash-down sanitation and the cross-contamination control between the raw and ready-to-eat zones. The pressurisation cascade holds the ready-to-eat preparation zone positive to the raw vegetable handling, which in turn is positive to the trim and waste collection.

Poultry, egg wholesale and allergen segregation

The wholesale poultry handling at Sydney Markets, Brisbane Markets, Melbourne Markets, Adelaide Pooraka and Perth Canning Vale integrates fresh chicken, duck, turkey, quail, fresh egg and the broader poultry value chain. FSANZ 4.2.4 zoonotic risk management drives the cross-contamination control between the raw poultry handling and the cooked product preparation, with strict Salmonella and Campylobacter monitoring on the operator HACCP programme.

The poultry wholesale HVAC is segregated from the red meat and pork wholesale through separate ductwork systems and pressurisation cascades. The poultry chilled holding runs at minus 1 to plus 4 degrees Celsius with the connected freezer compartments at minus 18 degrees Celsius. The duct is 316L stainless at 1.2 to 1.5 millimetre over the open carcass and primal handling zones, with welded longitudinal seam and the same hygienic finish, V-groove drip-tray and removable cleaning access as the broader meat wholesale hall.

The egg wholesale operation handles fresh shell egg and processed liquid egg supply. The fresh shell egg is held at 4 to 8 degrees Celsius in dedicated egg coolers, with the wholesale supply running to the Coles, Woolworths, ALDI, Metcash and independent retailer destinations. The HVAC duct over the egg wholesale is galvanised at 0.8 to 1.2 millimetre since the shell egg is contained in sealed cartons through the wholesale handling, but the connected processed liquid egg line runs FSANZ 4.2.1 spec 316L stainless ductwork.

SBKJ machine supply for wholesale market HVAC fabrication

SBKJ Group at Box Hill North VIC supplies the full machine suite for the Australian wholesale market HVAC fabrication chain. The flagship machine for the rectangular duct production is the SBAL-V auto duct line. The SBAL-V handles coil thickness from 0.6 to 1.5 millimetres in both galvanised standard and 316L food-grade stainless variants. The line integrates decoiler, leveller, punch press with corner notcher, shear, longitudinal seam former (Pittsburgh lock for non-critical zones or welded seam fed from the SBSF-1525 or SB-ZF1500 stitchwelder for production-zone duct), TDF flange former and pin-roller for the transverse joint, and an integrated handling table for the finished rectangular duct piece. Production rate at standard 316L 1.2 millimetre runs is roughly 8 to 12 metres per minute of finished duct.

The SBAL-III is the auto duct line variant for galvanised steel at 0.8 to 1.2 millimetre coil thickness, suited to the general wholesale market HVAC supply and return duct that does not pass over open product. The SBAL-III is the standard configuration for the office HVAC, the loading dock supply, the back-of-house corridor and the dry-goods retail zone duct supply.

The SBSF-1525 stitchwelder handles the spot-weld hygienic seam construction at 1.0 to 1.5 millimetre coil width to 1525 millimetres. The SBSF-1525 is the standard machine for the wholesale fish market and the wholesale meat hall duct longitudinal seam where the welded construction is required but the full continuous TIG seam is not.

The SB-ZF1500 continuous TIG stitchwelder handles the fully sealed welded longitudinal seam at 1.0 to 1.5 millimetre coil width to 1500 millimetres. The SB-ZF1500 is the standard machine for the AQIS export licence envelope at Sydney Fish Markets and for the highest hygiene specification on the wholesale meat hall and the ready-to-eat preparation zone.

The SBFB-1500 spiral tubeformer is the round spiral hygienic duct machine for the standard 200 to 1500 millimetre diameter range serving the auction hall extract, the cold store make-up air and the IQF tunnel freezer plant supply.

The SBPC1500 plasma cutter handles the 1.2 to 1.5 millimetre 316L plate cutting for fitting blanks, stack flange preparation and access panel cut-out. The high-definition plasma head produces a clean cut edge suitable for the hygienic finish post-grind.

The SBLR-600 longitudinal seam welder is the fitting seam welder for bend, tee, reducer and offset fittings, running continuous TIG seam in 316L stainless.

The SBTF-1500 spiral tubeformer covers diameters to 1500 millimetres, the SBTF-1602 covers the 1602 millimetre standard, and the SBTF-2020 covers the larger 2020 millimetre diameter applications such as the wholesale auction hall trunk extract over the Sydney Markets Flemington trading floor or the Brisbane Markets Rocklea fresh centre. The SBTF range is the standard for the largest trunk diameter sections feeding the air handler discharge into the open trading floor envelope.

The full SBKJ machine suite is supported by the Box Hill North VIC engineering and FAT facility, with every wholesale market spec duct package factory acceptance tested before dispatch to the Sydney, Brisbane, Melbourne, Adelaide, Perth, Hobart and Darwin destinations. SBKJ will be exhibiting at ARBS 2026 in May at the International Convention Centre Sydney with the wholesale market HVAC specification and the integrated machine demonstration on the SBKJ stand.

Standards compliance summary for wholesale market HVAC

The Australian wholesale market HVAC specification integrates roughly twenty separate Australian Standards, FSANZ Food Standards Code clauses and National Construction Code provisions. The compliance dossier for any major wholesale market HVAC project covers AS 1668.1 (the use of ventilation and air conditioning in buildings — fire and smoke control), AS 1668.2 (the use of ventilation and air conditioning in buildings — mechanical ventilation in buildings), AS 4254 (ductwork for air-handling systems in buildings), AS 1530.4 (methods for fire tests on building materials, components and structures), AS 1851 (routine service of fire protection systems and equipment), AS 1657 (fixed platforms, walkways, stairways and ladders), AS/NZS 60079.10.1 (explosive atmospheres — classification of areas — explosive gas atmospheres), AS/NZS 1677 (refrigerating systems), AS/NZS 5149 (refrigerating systems and heat pumps — safety and environmental requirements), AS 4696 (the hygienic production and transportation of meat and meat products for human consumption), AS 4326 (the transport of meat and meat products), AS/NZS 4674 (construction and fit-out of food premises), FSANZ Food Standards Code 4.2.1 (primary production and processing standard for seafood), 4.2.2 (microbial control), 4.2.3 (chemical residue), 4.2.4 (zoonotic), 3.2.2 (food safety practices) and 3.2.3 (food premises construction), AS/NZS 2243.3 (where PC2 biocontainment applies to rare meat or seafood quarantine), AS 1428.1 (DDA access), AS 1735 (lift), AS 3580 (air quality), AS 4775 (emergency eyewash and shower), ISO 22000 (food safety management) and the AQIS export licence framework for the Sydney Fish Markets exports to Japan, Korea, USA, EU and broader Asia. The National Construction Code Class 7b (food storage), Class 8 (industrial), Class 5 (office) and Class 9b (assembly — public market, auction hall, retail) provisions apply across the integrated wholesale market envelope.

The industry body framework is led by the Australian Fresh Produce Alliance (AFPA) as the peak body for the wholesale produce sector, with Hort Innovation (the Horticulture Innovation Australia statutory levy body) covering the broader produce industry research and development. AUSVEG covers the vegetable industry, the Sydney Markets, Brisbane Markets, Melbourne Markets, Adelaide Markets and Perth Markets each operate their own industry liaison body, the Australian Seafood Industry Council (ASIC) and Sydney Fish Markets cover the seafood industry, the Australian Council of Prawn Fisheries covers the prawn sector, Tassal, Huon and Petuna cover the salmon sector, Coles, Woolworths, ALDI and Metcash cover the retail end, and the National Retail Association (NRA), Australian Retailers Association (ARA), AMIC (Australian Meat Industry Council), MIA (Meat Industry Association of Australia), FSANZ (Food Standards Australia New Zealand) and AQIS Biosecurity cover the broader regulatory framework.

The MSC (Marine Stewardship Council) and FAO (Food and Agriculture Organisation) certification programmes apply to the international fish trade through the Sydney Fish Markets and the export-licensed wholesale fish operators. The halal certification under the Australian Halal Certification Body (AHCB), the kosher certification under Kosher Australia and the organic certification under NASAA (National Association for Sustainable Agriculture Australia) and ACO (Australian Certified Organic) all apply across the wholesale meat, seafood and produce supply chain.

Conclusion

The Australian wholesale market network — Sydney Markets Limited at Flemington, Sydney Fish Markets at Pyrmont, Brisbane Markets Limited at Rocklea, Melbourne Markets Limited at Epping, Adelaide Produce Markets at Pooraka, Perth Markets Group at Canning Vale, Hobart Markets Wholesale at Cambridge and the smaller Darwin Wholesale operation — runs the highest-throughput, lowest-margin, most-audited HVAC operation in the Australian food industry. The combined annual throughput of roughly 6 to 8 million tonnes of fruit, vegetable, flower, fish, meat, poultry and egg passes through the wholesale auction floor, the cold store, the IQF tunnel freezer plant, the ripening room, the wet market, the food court and the loading dock every year. The HVAC duct specification is the foundational infrastructure that keeps the cold chain intact, the food safety compliance dossier clean and the auction floor operating at the demanding 2 AM to 8 AM peak that the wholesale market sector has run for over a century.

SBKJ Group at Box Hill North VIC supplies the full machine suite for the Australian wholesale market HVAC fabrication chain — the SBAL-V at galvanised standard and at 316L food-grade variant, the SBAL-III at galvanised, the SBSF-1525 stitchwelder, the SB-ZF1500 continuous TIG stitchwelder, the SBFB-1500 spiral tubeformer, the SBPC1500 plasma cutter, the SBLR-600 longitudinal seam welder and the SBTF-1500, SBTF-1602 and SBTF-2020 spiral tubeformer range. Every wholesale market spec duct package is factory acceptance tested before dispatch to the Sydney, Brisbane, Melbourne, Adelaide, Perth, Hobart and Darwin destinations. SBKJ will be exhibiting at ARBS 2026 in May at the International Convention Centre Sydney with the wholesale market HVAC specification and the integrated machine demonstration on the SBKJ stand.