Spirit Distillery, Barrel Rickhouse and Bonded Whisky Warehouse HVAC Duct Guide — Lark, Sullivans Cove, Starward, Archie Rose, Bundaberg, Beenleigh

Why spirit distillery and rickhouse HVAC is its own discipline

A general comfort-cooling engineer walking into their first Australian whisky distillery, rum distillery or bonded rickhouse usually under-estimates the same five things. The ethanol vapour load is bigger than they expect and the hazardous-area zones extend further than they expect. The angels' share evaporation from a stocked cask warehouse is not the trivial number the brochure suggests — in an Australian climate it is genuinely large. The spirit safe room is governed by Australian Taxation Office bonded-distillery rules as well as by Safe Work Australia exposure standards, and the two regimes have different drivers. The cooper shop char and toast hoods, when there is an on-site cooperage, behave like a small wood-fired smokehouse with its own emissions and fire scope. And the visitor-centre tasting room, which usually gets bolted on to the production hall in the masterplan, has to be HVAC-segregated from production so cleanly that it could be a separate building.

None of these are unsolvable problems. They are, collectively, the reason that copy-pasting a comfort-cooling specification — even from a brewery or a winery — will not produce a compliant Australian spirit-distillery outcome. The standards stack is denser, the hazardous-area dossier is larger, the regulatory touch from the Australian Taxation Office is constant, and the building physics of a rickhouse running through a thirty-year maturation cycle is unlike anything else in food and beverage. This guide is the engineering brief SBKJ uses with whisky, rum and gin distillery clients across Australia and the export markets we serve.

The structure below follows the spirit process flow. We open with what makes the discipline distinct and the standards stack that governs it. We then walk through the Australian operator landscape — Lark, Sullivans Cove, Hellyers Road, Overeem, Belgrove, McHenry, Old Kempton, Adams, Killara, Spring Bay, Starward, Bakery Hill, Backwoods, The Gospel, Archie Rose, Black Gate, New England Distilling, Limeburners, Great Southern Distilling Co, Kangaroo Island Spirits, Adelaide Hills Distillery, 23rd Street, Bundaberg, Beenleigh, Husk, Mr Black, Inner Circle, Helms, Four Pillars, The Botanist Australia, Settlers Spirits, Nip of Courage, and the cluster behind the Australian Distillers Association and Spirits and Cocktails Australia — because the engineering choices look different at each scale and in each climate. We then work zone by zone through the HVAC scope: mash, wash back, still hall, spirit safe, cask filling, rickhouse and bonded warehouse, cooper shop, vatting hall, bottling hall, tasting room, visitor centre and quality laboratory. Finally we cover material decisions, sustainability, craft-scale practicality and the SBKJ machinery options for fabricating the duct.

1. The five things that make spirit distillery HVAC distinct

Ethanol vapour as the dominant hazard. Pot stills, column stills, spirit safes, spirit receivers, cask filling stations and rickhouses all release ethanol vapour into the working air. The Lower Explosive Limit of ethanol in air is 3.3 per cent by volume. The Safe Work Australia Workplace Exposure Standard for ethanol is 1,000 ppm as an 8-hour TWA. HVAC design has to keep the bulk air below 25 per cent of the lower explosive limit at every monitored point in normal operation, and well below 1,000 ppm at any breathing-zone location, and the ventilation has to keep running on emergency power. None of this is optional. Insurers, Safe Work Australia inspectors and the Australian Taxation Office bond auditors will all check.

Hazardous-area zoning that extends into the duct system. Under AS/NZS 60079.10.1, the still vapour vent and a documented radius around it are Zone 1 (likely to be present in normal operation), the surrounding still room out to a wider radius is Zone 2 (unlikely in normal operation, short duration if it occurs), and the broader still hall outside the radius is non-classified provided general ventilation is adequate. Within the classified zones, every HVAC motor, every fan wheel, every damper actuator, every sensor and every light fitting has to carry matching Ex marking selected for ethanol (Group IIB, temperature class T3 or cooler). The classification also extends into the rickhouse, where cask voids are normally Zone 1 and aisle space is Zone 2; into the spirit safe room, normally Zone 1 inside the safe and Zone 2 in the surrounding room; and into the capping zone of the bottling hall.

Angels' share as a chronic ventilation load. The angels' share — the ethanol and water that evaporate through the oak during maturation — runs about 2 per cent of cask contents per year in moderate climates and up to 4 per cent in hot Australian climates. A 5,000-cask warehouse at 200 litre per cask and 63 per cent ABV holds roughly 630,000 litres of pure ethanol. A 2 per cent annual loss is therefore 12,600 litres of pure ethanol vapour released into the warehouse air every year, plus a similar volume of water vapour and the volatile aromatic congeners that drive maturation chemistry. That release is the chronic background load that rickhouse ventilation has to dilute below 1,000 ppm 8-hour TWA and below 25 per cent of the lower explosive limit. It is not the once-a-quarter spike load — it is constant, all year, every year, for the entire stock life of the warehouse.

Australian Taxation Office and Customs controls on the spirit safe and bond. The spirit safe, the spirit receiver, the cask filling station and the bonded warehouse are all controlled by the Australian Taxation Office under spirits excise legislation and the bonded-warehouse regime that Australia inherited from the United Kingdom Customs and Excise framework. Access is restricted, locks are sealed, CCTV is mandatory, and the duct routing has to avoid creating any practical bypass of those controls. HVAC engineers working in a bond have to design duct, return air paths and access doors with the bond auditor in mind. A return duct that passes from the bond into a non-bonded space without an audit-traceable damper and seal is the kind of detail that delays bond approval by months.

Cooper shop, char and toast extraction. Distilleries that operate an on-site cooperage — charring fresh American oak staves or toasting French oak for finishing — run a small woodfired process with its own combustion, smoke, steam, volatile organics and fire scope. The hood and duct serve a function close to a commercial smokehouse exhaust, but with intermittent very high heat fluxes and oak ash debris. AS 3814 (industrial fired appliances) and AS 1530.4 (fire-rated penetrations) both apply, the duct material has to survive the heat and ash, and the discharge stack height has to satisfy the state EPA odour rules for an industrial premises. The cooper shop is normally a separate fire compartment from the still hall and the warehouse, and the duct routing reflects that.

2. The Australian standards stack for spirit distillery and bonded warehouse HVAC

The Australian engineer has a denser standards stack to work through than almost any other beverage vertical. The core stack:

• AS 1668.2 — The use of ventilation and air-conditioning in buildings: mechanical ventilation in buildings. Air-change rates, exhaust sizing, occupancy outdoor air rates and the framework for proving the bulk air composition stays compliant.
• AS 4254 (and AS/NZS 4254 where applicable) — Ductwork for air-handling systems in buildings. Construction class, seal class, leakage testing, pressure class.
• AS 1530.4 — Methods for fire tests on building materials, components and structures: fire-resistance tests for elements of construction. Fire-rated penetrations where duct passes a fire compartment boundary, including the dampers and the penetration sealing system.
• AS/NZS 60079.10.1 — Explosive atmospheres: classification of areas — Explosive gas atmospheres. The hazardous-area dossier for ethanol vapour Zone 0, 1 and 2.
• AS/NZS 60079.10.2 — Explosive atmospheres: classification of areas — Explosive dust atmospheres. The dust hazardous-area dossier for grain dust Zone 20, 21 and 22.
• AS 1940 — The storage and handling of flammable and combustible liquids. Class 3 flammable liquids (ethanol, new-make spirit, matured spirit at over 23 per cent ABV) in packaged and bulk storage. Specific ventilation requirements for bunded compounds, indoor storage and tank farms.
• AS 3814 — Industrial and commercial gas-fired appliances. Still firing, mash kettle steam, hot water plant, cooper shop char ovens.
• AS 1657 — Fixed platforms, walkways, stairways and ladders. Rickhouse access platforms and the routing of HVAC ducts overhead of those platforms.
• AS 1851 — Routine service of fire-protection systems and equipment. Maintenance regime for HVAC fire dampers, smoke dampers and air-handling units serving fire-protected zones.
• AS 2118 series — Automatic fire-sprinkler systems. Sprinkler protection for bond stores, still halls and bottling halls. Coordination of sprinkler runs with HVAC ductwork.
• AS/NZS 4779.2 — Vapour control principles from paint-shop practice that translate directly to bottling-hall vapour management.
• NFPA 30 — Flammable and Combustible Liquids Code. Often referenced where the project insurer is US-based or where the project draws on US distillery practice.
• NFPA 30A — Motor Fuel Dispensing Facilities. Indirectly relevant where bulk ethanol pumping resembles fuel-dispensing.
• NFPA 11 — Standard for Low-, Medium- and High-Expansion Foam. The foam alternative to water sprinkler for ethanol-pool fire scenarios in bonded warehouses.
• NFPA 12 — Standard on Carbon Dioxide Extinguishing Systems. Used in spirit safe enclosures and selected machinery rooms.
• NFPA 13 — Standard for the Installation of Sprinkler Systems. Frequently referenced where AS 2118 needs harmonisation with US distillery practice.
• NFPA 70 (National Electrical Code) — Article 500 Class I Division 1 and Division 2 classification framework for hazardous areas, frequently cross-referenced with AS/NZS 60079.
• NFPA 660 — The consolidated combustible-dust standard that replaced NFPA 484 and other commodity-specific dust standards. Governs grain-dust hazard in mash rooms and mills.
• HACCP — Hazard Analysis and Critical Control Points. The food-safety framework that distilleries adopt for the grain-to-bottle chain, including HVAC contamination control on open-product zones.
• Australian Taxation Office Spirits Excise and Bonded Warehouse rules — The federal framework that controls access, audit, locks, seals and CCTV in any spirit safe, spirit receiver, cask filling station, bonded warehouse and bottling line until duty is paid.
• Safe Work Australia Workplace Exposure Standards — Ethanol 1,000 ppm TWA, methanol 200 ppm TWA, acetic acid 10 ppm TWA, acetaldehyde 20 ppm TWA, butanol 50 ppm, isopropanol 400 ppm. All five are present in distillery air to some degree and all five are HVAC sizing inputs.

Where the project is export-oriented — and most Australian craft whisky operators are now exporting to Asia, North America and Europe — the additional standards stack includes the equivalent ATEX or IECEx framework in the destination market, USP and FCC for any pharmaceutical-grade ethanol production, and the relevant BRC, SQF or IFS audit if the spirit feeds a food retailer's own-label programme.

3. The Australian whisky operator landscape

Australian whisky has grown from a handful of pioneers in the 1990s into more than three hundred licensed distilleries, with concentrations in Tasmania, Victoria, New South Wales, South Australia and Western Australia. The HVAC engineering brief is different at each scale and in each climate. We work to a four-segment view:

Tasmanian craft single malt. The Tasmanian Spirit Industry Cluster originated with Lark Distillery in Hobart, founded by Bill Lark in 1992 and listed on the Hong Kong Stock Exchange in recent years. Sullivans Cove at Cambridge near Hobart, World's Best Single Malt 2014, runs a heritage Highland-style distillation profile with cool-climate maturation. Hellyers Road in Burnie on the north-west coast is one of the largest by output. Overeem in Hobart, Belgrove in Kempton with on-site malting and a unique steam-from-vegetable-oil fuel cycle, McHenry Distillery on the Tasman Peninsula, Old Kempton in Kempton, Adams, Killara, Spring Bay at Spring Beach and a long tail of smaller producers fill out the cluster. Tasmania is cool enough that passive dunnage warehousing remains practical, the angels' share runs lower than mainland sites, and the HVAC engineering scope is dominated by still hall ethanol vapour rather than rickhouse extraction.

Mainland craft single malt. Starward Distillery at Port Melbourne pioneered the wine-cask-finished Australian single malt with a deliberately accelerated maturation profile suited to Melbourne's climate. Bakery Hill, also in Melbourne, was one of the first mainland craft single malts. Limeburners and the broader Great Southern Distilling Co operation in Albany Western Australia. Kangaroo Island Spirits on Kangaroo Island South Australia. Adelaide Hills Distillery. 23rd Street Distillery in Renmark, South Australia. Backwoods Distilling in Yackandandah, Victoria. The Gospel in Brunswick, Victoria, with a rye-whisky focus. Archie Rose in Rosebery, New South Wales, runs a multi-spirit operation with on-site bond. Black Gate Distillery in Mendooran, New South Wales. New England Distilling in Inverell, New South Wales. The mainland sites generally run hotter than Tasmania, the angels' share is higher, and rickhouse mechanical ventilation becomes a larger HVAC line item.

Australian rum. Bundaberg Rum at Bundaberg, Queensland, owned by Diageo, is Australia's largest rum distillery and one of the largest single-site spirit operations in the country. Beenleigh Rum Distillery near Brisbane is Australia's oldest continuously operating distillery dating to 1884. Husk Distillers in the Tweed Valley, New South Wales, runs an estate-grown agricole-style rum. Mr Black Cold Brew, originally in New South Wales, runs a coffee-liqueur production. Inner Circle Rum and Helms Rum complete the picture. The rum sites all run in hot, humid coastal climates where the angels' share is at the upper end of the Australian range, the climate-controlled rickhouse case is strongest, and the bonded warehouse is normally the largest single HVAC scope on the site.

Australian gin. Four Pillars in Healesville, Victoria, in the Yarra Valley wine country, is one of the largest by output and the most internationally recognised. Archie Rose in Rosebery, New South Wales, runs gin alongside whisky. Bombay Sapphire operates a cross-licensed Australian arm. The Botanist Australia, Settlers Spirits, Nip of Courage and a long tail of craft gin distillers complete the cluster. Gin HVAC is simpler than whisky HVAC because there is no long maturation phase, so the rickhouse line item is small or absent; but the still hall, vapour basket, juniper and botanical receiving, and bottling hall all carry the full hazardous-area regime.

Multi-spirit and cluster. The Australian Distillers Association (ADA) represents the craft cluster federally. Spirits and Cocktails Australia is the broader industry body covering the multinationals and the craft sector. ANGRA Spirits group operates as a contract distilling and brand house. The Tasmanian Spirit Industry Cluster runs the Tasmanian-specific coordination. All four bodies are useful reference points for the engineering team because they hold the corporate-membership records that map to site addresses, and they run the industry-wide HVAC and safety guidance that informs site-level specifications.

4. Mash room and mill room HVAC

The mash room is where the engineer first encounters the combustible-dust hazard. Malted barley, unmalted barley, wheat, rye, corn and oat dust are all combustible particulates under NFPA 660. Kst typically falls in the 50 to 200 bar metres per second range, MIE in the tens to low hundreds of millijoules, MIT in the low hundreds of degrees Celsius. In practice that puts most distillery grain dust in the St-1 class — combustible, but not the violent class that, for example, aluminium powder occupies. The hazard is real, the engineering is well understood, and the standards stack is clear: AS/NZS 60079.10.2 for the dust zoning, AS 1668.2 for the ventilation rates, AS/NZS 4360 for the documented risk-management approach, and NFPA 660 for the consolidated dust standard.

The HVAC scope in the mash room covers four flows. Grain receiving dust collection at the grain pit or silo discharge, sized for the throughput rate; mill room dust collection at the roller or hammer mill, normally the highest dust loading on the site; transfer dust at the conveyor takeover points, intermediate hoppers and the mash tun charging dock; and general space ventilation, with about 6 to 10 air changes per hour to dilute residual dust to a safe working level. The dust collector itself is a bag or cartridge filter sized for the dust loading, located outside the mash room in a separate fire compartment where practical, with isolated explosion venting on the collector, spark detection upstream and rotary valve isolation between the collector and the process.

Material choice for the dust transport duct: conductive PVC bonded and earthed is acceptable for cold dust transport at lower velocities; carbon steel or stainless steel is the more typical choice for the velocities normally used in dust collection (18 to 25 metres per second to keep grain dust moving without dropout). Smooth internal surface, sweep elbows rather than mitred elbows, dedicated cleanout doors at every elbow, and continuous bonding and earthing of every duct section. The mash tun charging hood normally needs stainless 304L because it sees steam from the wet mash as well as dust from the dry charge.

The mash tun and lauter tun themselves are sealed pressure vessels for hot wort, but the vapour off-take from the wort copper and the lauter tun underback runs at about 100 degrees Celsius and high humidity. A latent-load capture hood with stainless 304L duct, condensate trap at the low point, sloped duct draining to the trap, and a discharge to outside that does not cross any cooler ducts is the normal pattern. The latent load is large — an Australian craft whisky distillery doing two mashes a day at 4,000 litres per mash drives about 800 litres of water vapour into the mash room air over the workday. Heat recovery from that vapour to pre-heat strike water is normal practice on a site doing more than 500,000 litres of mash a year and is an attractive payback below the AS 3814 framework's safety constraints.

5. Wash back room ventilation and CO2 control

Wash backs — the fermentation vessels into which the mash is pitched with distillers' yeast — are the dominant CO2 source on the site. The stoichiometry is the same as in a brewery: about 4 grams of carbon dioxide produced for every gram of ethanol made. A 10,000 litre wash back at 8 per cent ABV produces about 3,200 kg of CO2 over a five-day primary fermentation. A distillery running ten wash backs in active fermentation simultaneously is therefore producing 32 tonnes of CO2 over a five-day cycle, or roughly 270 kg per hour into the wash back room air.

CO2 is colourless, almost odourless and 1.5 times denser than air, so it pools at slab level. Safe Work Australia Workplace Exposure Standards align with the international threshold of 5,000 ppm as an 8-hour TWA and 30,000 ppm as a 15-minute STEL. Lethal doses begin around 70,000 to 100,000 ppm within minutes. Every wash back room exhaust system must pull from low level, alarm at 5,000 ppm, force lockout at 15,000 ppm and continue to run on emergency power. The single most common fatal incident profile in the global brewing and distilling industry is a worker entering a fermentation cellar after the ventilation has tripped — the engineering safeguards exist because of a long record of fatalities.

The HVAC scope: 10 air changes per hour minimum based on the gross room volume, with low-level extraction grilles at 200 to 400 mm above slab and high-level make-up air across the opposite face of the room. Conductive duct construction with bonding and earthing on the off-chance of static-charge accumulation. CO2 sensors at three vertical heights (slab, breathing zone, ceiling) cross-checked against each other to prevent a single-sensor failure masking a real event. A duct-routed return air path that does not allow CO2-rich air to migrate into adjacent occupied zones. And a documented procedure for re-entry after a ventilation trip that does not rely on personal CO2 monitors as the primary control.

Material choice: 304L stainless duct on the wash back room extract is normal because the air is humid and lightly acidic from yeast metabolism. The fan wheel can be steel for general service, but a non-sparking aluminium-alloy or stainless wheel is preferred because some wash back rooms are also classified Zone 2 under AS/NZS 60079.10.1 due to ethanol vapour from the wash back tops. Ex-rated fan motors are required where the room is so classified.

6. Still hall ventilation — pot stills and column stills

The still hall is the centrepiece of the engineering brief. A copper pot still firing the wash at low wines stage, or running the spirit cut from low wines and feints, releases ethanol vapour through every joint that is not absolutely sealed: the manhole gasket, the lyne arm joint where the swan neck meets the condenser, the rummager packing where fitted, the doll's eye sight glass and the spirit safe sample tap. A column still running continuously has fewer joints but a higher continuous vapour load.

The general design pattern: 10 to 15 air changes per hour with high-level exhaust capture above each still neck and the spirit receiver, low-level make-up air at the still floor brought in through tempered outdoor-air handlers, continuous ethanol detection across the room cross-zoned with forced shutdown of ignition sources at 25 per cent of the lower explosive limit, and Ex-rated motors, sensors, dampers and lighting within the classified zone documented in the hazardous-area dossier. AS/NZS 60079.10.1 normally places the lyne arm and condenser exterior in Zone 1, the surrounding 1 to 3 metres in Zone 2 and the wider hall as non-classified provided general ventilation is adequate — but the actual radii must come from the written dossier prepared by a competent person.

Duct material in the still hall: 304L stainless is the baseline for all hazardous-area extract and any local capture hood that takes the high ethanol concentration. The general space return for the non-classified section of the hall can be galvanised G90 because it sees only diluted air below 25 per cent of the lower explosive limit. The transition from stainless to galvanised happens at the documented zone boundary and is shown clearly on the drawings, with a bonded coupling that maintains electrical continuity for static dissipation.

SBKJ machine recommendation for the still hall scope: an SBAL-V auto duct line in 304L stainless variant fabricates the rectangular extract from 200 to 1,500 millimetre width with TDF flange forming integrated, output up to 16 metres per minute and forming pressures adjusted for the work-hardening characteristics of 304L. Galvanised return ducts come off the same SBAL-V in galvanised variant. Round spiral duct for cross-room transfer comes from an SBTF-1500C, SBTF-1602 or SBTF-2020 depending on the largest diameter required.

Fans: every extract fan in the classified zone must be a non-sparking design (aluminium alloy or austenitic stainless wheel), with an Ex-rated motor selected for Group IIB ethanol service and temperature class T3 or cooler. The fan housing and the duct system must be electrically bonded and earthed end to end with documented continuity testing. Belt-driven fans are acceptable provided the belt is anti-static rated; direct-drive is normally preferred for the inverter compatibility and reduced maintenance scope.

7. Spirit safe room HVAC and Australian Taxation Office controls

The spirit safe is a sealed brass-and-glass instrument enclosure through which the new-make spirit runs as it leaves the condenser, allowing the distiller to cut foreshots, hearts and feints by hydrometer reading and sample tap. The safe is sealed by the regulator — in the United Kingdom historical tradition by Customs and Excise, in Australia by the Australian Taxation Office under the Excise Act — and access is restricted. The safe is locked, the room is locked, CCTV records continuously, and the duct routing has to avoid creating any practical bypass of those controls.

The HVAC scope: 6 to 10 air changes per hour, low-level extraction (ethanol vapour at room temperature is denser than air), Ex-rated equipment matching the documented Zone 1 inside the safe boundary and Zone 2 in the surrounding room, no return air recirculation back into the still hall or any other occupied zone, and a make-up air supply that does not pull ethanol-rich air from adjacent zones. The make-up air is normally tempered outdoor air, with a single damper on the supply side and a single damper on the extract side, both auditable from outside the room without breaking the bond seal.

Material choice: 304L stainless throughout for the safe room HVAC. The room is small — typically 20 to 60 square metres — so the duct quantity is modest and the cost premium over galvanised is small. The benefit is that the air is humid and saturated with ethanol vapour, the cleaning regime uses an alcohol-based wipe-down, and galvanised duct would corrode at the seams faster than the inspection cycle would catch.

Bond-audit considerations: any duct that passes through the spirit safe room boundary into a non-bonded space needs a damper, a tamper-evident seal on the damper actuator, and an auditable position-indicator visible from outside the room. The Australian Taxation Office bond auditor will inspect those penetrations and will refuse bond approval if a duct route creates an unsealed path between bonded and non-bonded space. We have seen project handover delayed by months because the duct route was finalised before the bond officer reviewed the drawings.

8. Cask filling station HVAC

The cask filling station is where finished spirit at typically 63 per cent ABV is gravity-fed or pumped from the spirit receiver into individual casks. The station handles open spirit, the operator is in close proximity, the vapour leakage during fill is significant, and the immediate area is classified Zone 1 around the fill head and Zone 2 in the surrounding work area. The HVAC scope: a local capture hood above each fill head with stainless 304L extract duct, 10 to 15 air changes per hour in the cask filling room, low-level extract grilles supplemented by the local capture, and continuous ethanol detection.

Cask filling rate matters for the sizing calculation. A craft distillery filling 10 casks per week at 200 litres per cask and 63 per cent ABV is releasing roughly 25 litres of pure ethanol vapour into the room air per filling session, mostly during the few minutes that each cask is open under the fill head. A bulk distillery filling 50 casks per shift is releasing closer to 125 litres per shift, concentrated in the four-hour fill window. The capture hood has to handle the peak release rate, not the daily average.

The cask filling station is also part of the bonded space. ATO bond seals are applied to each cask at fill, the fill volume is recorded against the spirit excise account, and the cask filling station has the same access-control and CCTV regime as the spirit safe. HVAC drawings have to show the bond boundary and the audit-traceable damper positions.

9. Bonded warehouse and rickhouse ventilation

The bonded warehouse, also called the rickhouse in American terminology and the dunnage warehouse in Scottish terminology, is where filled casks mature for the legal minimum (two years in Australia for whisky to be labelled as such) and commercially typical (three to twenty years for premium products). The rickhouse is the largest single building on most distillery sites and the largest single HVAC scope by floor area. The engineering approach varies by warehouse style and climate.

Heritage Highland-style dunnage warehouse. Single-storey, casks three high on wooden stillions, earth or slate floor, slate or iron roof, louvred vents in the eaves and door undercuts. No mechanical ventilation, no heating, no cooling, no humidification. Air change is by natural buoyancy and wind. The angels' share evaporation is dispersed by the loose building envelope and the modest cask count per square metre of floor. In Tasmanian and Highland-Victorian climates, where the bulk air rarely runs hotter than 25 degrees Celsius for long, the passive approach works safely. Continuous ethanol monitoring at low level is still required for worker safety, and fire detection is mandatory under AS 1851 and AS 2118. The HVAC scope is therefore minimal — instrumentation and fire only.

Multi-storey racked warehouse. Two to six storeys, casks palletised or racked on steel racking, concrete floor, insulated roof. The cask density per square metre of floor is much higher than dunnage, the angels' share release per cubic metre of building volume is higher, and the climate inside the upper floors of an Australian summer rickhouse can run above 35 degrees Celsius without intervention. Passive ventilation is no longer adequate. Mechanical extract from low level on each floor, mechanical make-up at high level, ethanol detection at multiple points on each floor, fire protection per AS 2118 or NFPA 13 with foam alternative per NFPA 11, and intumescent fire dampers at every floor penetration are the standard scope. Mechanical ventilation rates run 1 to 2 air changes per hour in moderate climates and up to 4 air changes per hour in hot summer conditions, sufficient to keep ethanol below 1,000 ppm 8-hour TWA and below 25 per cent of the lower explosive limit at every monitored point.

Climate-controlled rickhouse. Glenmorangie pioneered the active climate-controlled rickhouse in the 1990s. Several Australian distilleries have adopted variants — some of the Adelaide Hills, some in the hotter mainland sites where ambient swings would otherwise drive accelerated angels' share losses, and some experimental Tasmanian projects. The target band is 14 to 22 degrees Celsius and 75 to 85 per cent relative humidity, with deliberate gentle seasonal swing rather than a hard setpoint — the maturation chemistry depends on some temperature cycling. The HVAC scope expands to include chilled water and hot water coils, humidifiers (normally adiabatic or atomising rather than steam for energy reasons), dehumidifiers (normally desiccant rather than DX for the deep-cycle case), sensible reheat, dedicated outdoor air for ethanol dilution and the control system that holds the band without forcing the bulk air below 25 per cent of the lower explosive limit. Capital cost is large; the rationale is shorter time-to-market on a controlled flavour profile rather than the accidental variability that uncontrolled maturation produces.

Material choice for rickhouse extract: 304L stainless baseline, 316L for coastal sites with chloride exposure (Husk Distillers in the Tweed Valley, the Beenleigh and Bundaberg Queensland rum sites, coastal Tasmania for some Lark and Sullivans Cove storage). Fan wheel non-sparking. Motor Ex-rated. Duct bonded and earthed end to end. Penetrations through fire compartment boundaries sealed per AS 1530.4 with fire dampers tested under AS 1851.

SBKJ machine recommendation for rickhouse extract: SBAL-V auto duct line in 304L stainless variant for the rectangular runs and the floor-to-floor risers; SBTF-1500C, SBTF-1602 or SBTF-2020 spiral tubeformer for the long horizontal runs in the warehouse roof space, with diameters typically 400 to 1,200 millimetres. Round spiral has better leakage performance and lower friction loss for long horizontal runs and is normally preferred over rectangular for the warehouse roof distribution.

10. The angels' share — quantifying the load

Engineering decisions about rickhouse ventilation hinge on a defensible estimate of the angels' share evaporation rate. The number varies with climate, warehouse style, cask size, oak species and char depth, fill strength, fill volume, and the age of the cask itself (older casks lose less). For Australian whisky and rum projects, the working numbers we use:

• Tasmanian dunnage warehouse, mid-elevation. 1.5 to 2.5 per cent per year. Lark, Sullivans Cove, McHenry, Old Kempton, Belgrove, Adams, Killara, Hellyers Road and Spring Bay all sit broadly in this band.
• Melbourne and Port Melbourne mainland. 2.0 to 3.0 per cent per year. Starward, Bakery Hill and the broader Melbourne cluster.
• Yarra Valley, Adelaide Hills cool mainland. 2.0 to 2.5 per cent per year. Four Pillars (although gin doesn't mature long), Adelaide Hills Distillery.
• Southwest Western Australia. 2.5 to 3.0 per cent per year. Limeburners and the Great Southern Distilling Co operation.
• Inland Murray-Darling. 3.0 to 4.0 per cent per year. 23rd Street Distillery at Renmark.
• Northern New South Wales and coastal Queensland. 3.0 to 4.0 per cent per year. Husk Distillers, Black Gate, New England Distilling, Bundaberg Rum, Beenleigh Rum Distillery.

Worked example. A 5,000-cask warehouse at 200 litres per cask and 63 per cent ABV holds approximately 630,000 litres of pure ethanol in stock. At 2 per cent annual loss, that is 12,600 litres of pure ethanol vapour released into the warehouse air per year, or 1.4 litres per hour averaged across the year. The molar mass of ethanol is 46.07 grams per mol; the ideal-gas volume at 25 degrees Celsius is 24.45 litres per mol. The 1.4 litres of liquid ethanol per hour at density 0.789 grams per millilitre is 1.10 kilograms per hour or 23.9 mol per hour, which produces 585 litres per hour of ethanol vapour at room temperature. To dilute that to below 1,000 ppm in the warehouse air requires the ventilation system to be moving at least 585,000 litres per hour of air through the warehouse, or 585 cubic metres per hour. A 5,000-cask warehouse with internal volume of about 25,000 cubic metres therefore needs about 0.025 air changes per hour just to dilute the chronic load, which sounds trivial — but the worst-case calculation is not the average. The worst-case is a hot summer afternoon at the top of the warehouse where local ethanol concentrations spike to 5 to 10 times the average. The design rule we use is 1 to 2 air changes per hour for passive-equivalent ventilation, 2 to 4 air changes per hour for active mechanical extract, sized to keep the worst-case local concentration below 25 per cent of the lower explosive limit (8,250 ppm or 0.825 per cent by volume) and below 1,000 ppm at any breathing-zone monitor.

The same calculation at 4 per cent loss in a hot inland or coastal Queensland rickhouse doubles to 1,170 litres per hour of ethanol vapour and pushes the worst-case ventilation rate higher. Bundaberg, Beenleigh, Husk and similar hot-climate rum operators face the largest rickhouse extract loads in the Australian industry. The HVAC line item is correspondingly large.

11. Cooper shop char and toast extraction

Distilleries that operate an on-site cooperage run a small woodfired process with its own emissions and fire scope. Charring fresh American oak staves involves running an open gas flame inside an assembled cask for 30 to 90 seconds, producing oak smoke, water vapour, partial pyrolysis products and a residual oak ash layer on the inside of the cask. Toasting French oak for finishing involves a slower, lower-temperature heat treatment, often over an oak charcoal fire, producing similar but smaller emissions. The cooper shop is normally a separate fire compartment from the still hall and the warehouse, and the HVAC scope reflects that.

The capture hood above each char or toast station is the dominant element. Hood face velocity of 0.5 to 1.0 metres per second across the open face during peak burn, captured volume sufficient to hold the emissions inside the hood plenum against the buoyant rise from the burning cask. Hood material: 304L stainless minimum, 316L preferred for the higher-end longevity case. Duct material: 304L stainless. Discharge stack: continuation of 304L stainless to the EPA-approved height, normally 3 metres above the ridge and clear of any occupied window or air intake within a 15-metre radius.

Fire protection in the cooper shop is governed by AS 3814 (industrial fired appliances), AS 1530.4 (fire-rated penetrations where the duct crosses the cooper shop boundary), AS 2118 (sprinkler protection within the compartment) and AS 1851 (maintenance regime). The duct itself crosses at least one fire compartment boundary on its way to the discharge stack, so a fire-rated and tested damper assembly at every crossing is mandatory. The cooper shop walls are normally 60 minute fire-rated to AS 1530.4 and the duct penetration sealing matches that rating.

EPA permit conditions for the cooper shop discharge: oak smoke and pyrolysis products are visible (Ringelmann 1 to 2 on heavy char) and have a characteristic odour. State EPA odour permits normally require modelling to confirm the discharge does not cause nuisance at the nearest sensitive receptor — residential, school, hospital, aged care. The modelling has to assume worst-case meteorology, not the average. In our experience the EPA permit conditions are the binding constraint on the discharge stack height and the location of the cooper shop within the masterplan, more so than the engineering of the duct itself.

12. Vatting hall, bottling hall and capping zone HVAC

The vatting hall is where matured spirit from multiple casks is blended in a vatting tank prior to bottling. The vatting tank handles open spirit at typically 50 to 65 per cent ABV. The capper zone of the bottling hall handles spirit at the final bottling strength (35 to 50 per cent ABV) but in much higher volume per hour and with much higher vapour release per minute due to fill turbulence and recap inspection. Both zones are normally classified hazardous areas: the vatting hall as Zone 2 around the tank top, the capper zone as Zone 2 or Class I Division 2 around the fill heads and capping station.

The HVAC scope: 6 to 12 air changes per hour, displacement ventilation pulling vapour away from operators, Ex-rated equipment in the classified zone and standard equipment elsewhere, sloped duct draining to a low-point drain plug, and stainless 304L throughout the local capture hoods and the hazardous-area extract. The general space return for the non-classified section can be galvanised. Label and carton lines need separate dust extraction for paper and cardboard fines.

Bottling hall hazardous-area classification specifics. Under AS/NZS 60079.10.1 with the equivalent ATEX framework, the immediate area around an open spirit fill head is Zone 1 for the duration of fill and Zone 2 outside the fill cycle. The capping station downstream of the fill, where the cap goes on and the bottle is sealed, is normally Zone 2 only because the head space exhaust above the fill has already removed most of the vapour. The label and carton stations downstream of capping are non-classified. The HVAC zoning follows the gas zoning: stainless duct and Ex equipment in the fill and capping areas, galvanised duct and standard equipment in the label and carton areas.

SBKJ machine recommendation for the bottling hall scope: SBAL-V auto duct line in 304L stainless variant for the fill and capping extract, SBAL-V in galvanised variant for the label and carton return, SBTF-1500C spiral tubeformer for the long horizontal runs in the hall roof, and the SBEM-1250 elbow former for the high-volume small-radius elbows that the bottling line layout normally needs. The SBSF-1525 slitting line at 2.5 kilowatt feeds the coil to the SBAL-V at the throughput rates a bottling hall package needs. SBFB-1500 flange bender at 7.5 kilowatts and 1.20 metres per minute handles the TDF flange forming on the larger duct sections.

HACCP scope. The bottling hall is the last open-product zone before the finished bottle is sealed. HACCP applies to the air-handling system feeding the fill area: filtered supply air, no recirculation of return air from non-bottling spaces, and a documented cleaning and validation regime for the supply duct that matches the bottling line's own clean-down cycle. The bottling line operator's quality audit (BRC, SQF or IFS depending on the retailer) will inspect the supply duct and the air-filter regime.

13. Tasting room and visitor centre HVAC

The visitor centre tasting room is the brand storefront for an Australian craft distillery. Lark in Hobart, Starward in Port Melbourne, Archie Rose in Rosebery, Four Pillars in Healesville, Hellyers Road in Burnie, Bundaberg Rum in Bundaberg, Beenleigh Rum Distillery near Brisbane and most of the broader Australian cluster all run integrated tasting and retail operations alongside production. The HVAC scope is comfort cooling but with a critical separation requirement: the tasting room air must not be cross-contaminated by ethanol vapour, grain dust or cooper-shop smoke from the production hall.

Design conditions: 22 to 24 degrees Celsius, 50 to 55 per cent RH, 6 to 10 air changes per hour, dedicated outdoor air sized for the maximum occupancy, return air recirculation up to about 70 per cent provided the return is taken only from tasting and retail spaces and not from production. The supply diffusers are sized for low background air movement so the sensory experience of the spirit is not disturbed by draughts. The acoustic environment is normally NC 30 to 35.

Cross-contamination control. The simplest way to keep production air out of the tasting room is to make the tasting room a separate building or a separate fire and air compartment of the main building, with its own air-handling unit, its own intake stack on the opposite side of the site from the still-hall and cooper-shop discharges, and a positive-pressure supply against the production hall (so any door opening drives air out of the tasting room into production, not the other way). When that is not possible architecturally, the alternative is a dedicated tasting-room AHU with HEPA-rated supply filtration and a return path that loops only within the tasting and retail spaces, no recirculation to production.

Material choice: galvanised G90 throughout. The tasting room is not a food-contact zone in the HACCP sense; the open spirit is in glassware, not in a process vessel. Galvanised duct is appropriate, dramatically cheaper than stainless, and easy to clean for the tasting-room operator. The supply diffusers are normally architectural to match the visitor-experience design, but the duct upstream is standard galvanised rectangular and spiral round.

14. Quality and sensory analysis laboratory HVAC

The quality and sensory analysis laboratory is normally a small but technically demanding HVAC scope. The lab houses gas chromatography (GC), high-performance liquid chromatography (HPLC) and titration benches for chemical analysis, and an isolated sensory tasting suite for the human panel that signs off every batch. The lab is normally regulated under HACCP for the food-safety chain and may also feed into the export-market evidence package for the bottling brand.

Design conditions: 21 to 23 degrees Celsius, 50 per cent RH, 8 to 12 air changes per hour, HEPA-filtered supply for the sensory rooms, dedicated fume-hood exhaust for the chemistry benches. Fume hoods over GC injection ports, HPLC solvent reservoirs and titration benches need a face velocity of 0.4 to 0.5 metres per second across the open sash, stainless or PP-lined duct for solvent vapour service, corrosion-resistant fan wheel and a discharge stack clear of any occupied window or air intake. Sensory tasting booths need very low background air movement (less than 0.1 metre per second at the head height) and zero cross-contamination from adjacent benches or the production hall.

Material choice: 304L stainless for the fume-hood extract; galvanised for the general lab supply and return. The lab is air-conditioned year-round and the duct system is normally part of a dedicated AHU sized for the lab load only, separated from the production hall AHU at both supply and return.

15. Material decision tree — 304L, 316L, galvanised

The single largest capital decision in the duct scope is the boundary between stainless and galvanised. We work to a four-band rule:

1. 316L stainless (1.4404). Specify for chloride-exposed zones and coastal sites — the Tweed Valley, the Queensland coastal sites, coastal Tasmania within 5 kilometres of the high-tide line, the Margaret River within 10 kilometres of the coast, and any zone where the cleaning regime uses citric, nitric or hydrochloric acid CIP. 316L is also the choice for the laboratory fume-hood extract where chloride-containing solvents are in use.
2. 304L stainless (1.4307). Specify as the baseline for all ethanol-vapour zones (still hall hazardous area, spirit safe room, cask filling, rickhouse extract, bottling hall fill and capping), all sanitary food-zone HVAC (mash tun charging hood, wash back room extract), all CIP exhaust runs, and the cooper shop char and toast extract.
3. Galvanised G90 (Z275). Specify for non-classified general HVAC return air, offices, dry stores, tasting room, visitor centre retail, vehicle access docks, mechanical plant rooms outside the bond, and the label and carton sections of the bottling hall. Galvanised is dramatically cheaper than stainless — the cost premium of 304L over galvanised is roughly 3 to 4 times on material alone, and the cost premium of 316L over galvanised is roughly 4 to 6 times.
4. Conductive carbon steel or stainless for grain-dust transport, FRP for high-humidity non-food applications, PP-lined for CIP caustic and acid extract. Specialty materials for specialty zones.

The cost rule of thumb. A typical Australian craft whisky distillery doing about 200,000 litres of pure alcohol per year, with a 2,000 cask warehouse, a small cooper shop and an integrated visitor centre, will have a duct package split roughly 25 per cent 304L stainless (still hall, spirit safe, cask filling, rickhouse, cooper shop, bottling fill and capping), 5 per cent 316L (coastal lab and CIP), 60 per cent galvanised (return air, offices, tasting, retail, dry stores) and 10 per cent specialty (grain dust, lab fume hood, CIP). Get the boundaries right at the start. The most common error we see is over-specifying 316L — it is the safe choice from a corrosion perspective but it adds material cost without proportional benefit in zones that do not actually see chloride.

16. Fire suppression and HVAC integration

Distillery fire scope is governed by AS 2118 (Australian sprinkler), AS 1530.4 (fire-rated penetrations), AS 1851 (maintenance), AS 3814 (industrial fired appliances), NFPA 30 (flammable liquids), NFPA 11 (foam), NFPA 12 (carbon dioxide), NFPA 13 (sprinkler) and NFPA 70 (electrical hazardous-area). The HVAC integration touches every one of these.

Fire dampers and smoke dampers at compartment boundaries. Every duct that crosses a fire compartment boundary — still hall to cooper shop, cooper shop to vatting hall, vatting to bottling, bottling to warehouse, warehouse to office — needs a fire damper tested to AS 1530.4 with a fire resistance level matching the wall (commonly 60 or 120 minutes). Smoke dampers at the same locations control smoke spread between compartments during a fire. AS 1851 requires routine inspection and testing.

Sprinkler protection in the bonded warehouse. A standard rickhouse is protected by AS 2118.1 wet-pipe sprinkler with foam concentrate addition for the ethanol pool-fire scenario, or by NFPA 11 foam system as an alternative. The HVAC ductwork has to coordinate with the sprinkler pipework at design stage: sprinkler heads need their clearance, the foam pourer locations need their reach, and the duct runs must not block sprinkler distribution patterns. We have seen multi-month rework cycles where the HVAC was installed before the sprinkler-system shop drawings were issued.

Smoke control in the still hall. AS 1668.1 (smoke control) intersects with the AS/NZS 60079 hazardous-area framework. Where the still hall has a smoke control system, the smoke fan and the smoke duct must be rated for the smoke temperature (commonly 300 degrees Celsius for 30 minutes or 400 degrees Celsius for 60 minutes), but the equipment in the classified zone must also carry the Ex marking. Sourcing a fan that is both smoke-rated and Ex-rated requires careful supplier selection.

Penetration sealing. AS 1530.4 fire-rated penetration sealing at every duct that crosses a fire compartment wall is mandatory. The sealing system is normally an intumescent collar around the duct combined with a fire pillow or mineral wool packing in the annulus. The sealing system has to be tested as a system with the specific duct material and size. The penetration register is a handover document and is audited by the fire engineer at certification.

17. Australian operator climate map — rickhouse load by region

The angels' share evaporation rate is the leading indicator of how much mechanical extract a rickhouse needs. We map the Australian operator landscape against climate as follows.

Cool maritime — Tasmania. Hobart, Cambridge, Burnie, Kempton, the Tasman Peninsula, Spring Beach. Annual mean temperature 11 to 13 degrees Celsius, summer max rarely above 25, winter mean 7 to 9. Lark, Sullivans Cove, Hellyers Road, Overeem, Belgrove, McHenry, Old Kempton, Adams, Killara, Spring Bay. Passive dunnage warehousing remains practical at modest cask counts. Angels' share 1.5 to 2.5 per cent. HVAC extract minimal; mechanical ventilation kicks in at multi-storey or hot-roof rickhouses.

Cool inland Victoria. Melbourne, Port Melbourne, Brunswick, Healesville, Yackandandah. Annual mean 14 to 16 degrees Celsius, summer max occasionally above 35, winter mean 8 to 10. Starward, Bakery Hill, The Gospel, Four Pillars, Backwoods. Passive warehousing borderline; multi-storey palletised stock needs mechanical extract. Angels' share 2.0 to 3.0 per cent.

Cool mainland South Australia. Adelaide Hills, the Barossa, McLaren Vale. Annual mean 15 to 17 degrees Celsius, summer max regularly above 35, winter mean 8 to 10. Adelaide Hills Distillery. Mechanical extract on multi-storey; passive borderline. Angels' share 2.0 to 2.5 per cent.

Cool maritime Western Australia. Albany, Margaret River. Annual mean 15 to 17 degrees Celsius, moderate summer, mild winter. Limeburners, Great Southern Distilling Co. Passive practical at modest scale; mechanical extract on multi-storey. Angels' share 2.5 to 3.0 per cent. Coastal chloride exposure pushes the material choice up to 316L for some zones.

Hot inland. Renmark, Mendooran, Inverell, the broader Murray-Darling and the New England Tablelands. Annual mean 17 to 20 degrees Celsius, summer max regularly above 40, winter cold but dry. 23rd Street Distillery, Black Gate, New England Distilling. Mechanical extract essential; climate-controlled rickhouse rational at premium-product scale. Angels' share 3.0 to 4.0 per cent.

Hot coastal subtropical. Northern New South Wales (Tweed Valley), South-East Queensland (Brisbane, Beenleigh), Central Queensland (Bundaberg). Annual mean 19 to 22 degrees Celsius, summer max above 35 with high humidity, mild winter. Husk Distillers, Mr Black, Beenleigh Rum Distillery, Bundaberg Rum. Mechanical extract essential; climate-controlled rickhouse standard at large scale. Angels' share 3.0 to 4.0 per cent. Coastal chloride exposure pushes the material choice up to 316L for many zones. Highest rickhouse HVAC capital load in the Australian industry.

Cool maritime island. Kangaroo Island. Annual mean 14 to 16 degrees Celsius, mild summer, mild winter. Kangaroo Island Spirits. Passive warehousing practical. Angels' share 2.0 to 2.5 per cent. Coastal exposure for material choice.

18. Sustainability and heat recovery

Distillery energy use is concentrated at the still firing, the mash kettle steam and the bottling hall hot-fill loop. Heat recovery and HVAC integration are increasingly part of the engineering brief as Australian distilleries pursue NCC Section J energy-efficiency compliance and the various state sustainability incentive schemes.

Vapour condenser heat recovery. The still hall lyne arm and condenser run with cooling water rejecting roughly 80 per cent of the still input energy as low-grade heat. A vapour-condenser heat recovery loop, typically chilled water from the condenser into a buffer tank and then into a pre-heat coil on the mash water feed, recovers most of that load. Payback is normally under three years on a still operating 200 days a year. The HVAC scope is the duct, valve and instrumentation for the heat-recovery loop and the integration with the mash room AHU.

Mash kettle vapour capture. The mash kettle vapour run is hot, humid and partly aromatic. Mechanical vapour recompression has been deployed in a small number of larger Australian projects; for craft scale, the more common pattern is a simple capture hood and a vapour-to-water heat exchanger that pre-heats the strike water for the next mash. Payback under five years on a site doing more than 500,000 litres of mash a year.

CO2 capture from fermentation. Wash back CO2 is high-purity once the early ferment-on is excluded and is a candidate for capture and re-use in dilution, packaging counter-pressure or external sale. Capture units are commercially available at the 50,000 hectolitre and above scale, less common at craft scale. The HVAC scope is the duct routing from the wash back top to the capture unit and the integration with the wash back room extract.

Cooper shop combustion air pre-heat. The cooper shop char and toast fires use atmospheric or low-pressure gas burners. Combustion air pre-heat from the discharge stack via a recuperator improves combustion efficiency by about 5 to 10 per cent. Modest payback; modest scope; worth the engineering review when the cooper shop is sized for more than 200 casks per week.

Heat recovery on the rickhouse climate-controlled system. A climate-controlled rickhouse running 24/7 with a tight humidity band is an energy-intensive operation. Run-around coils, plate heat exchangers and desiccant wheel heat recovery on the dedicated outdoor air make material difference to the operating cost. The HVAC engineer's brief includes the heat-recovery system as part of the AHU package, not a bolt-on.

19. Craft scale — what changes when the project is small

The Australian craft sector is large — more than 300 licensed distilleries — and most are below the scale that the engineering scope in this guide is sized for. The principle to hold onto: the standards stack does not change. AS 1668.2, AS/NZS 60079.10.1, AS/NZS 60079.10.2, AS 1940, AS/NZS 4254, AS 1530.4, AS 1851, AS 2118 and the Safe Work Australia Workplace Exposure Standards all apply to a craft distillery doing 5,000 litres of pure alcohol a year just as they apply to a Diageo-scale rum operation. The Australian Taxation Office bonded-distillery rules apply identically. The hazardous-area dossier requirement is identical. The angels' share calculation is identical — just with a smaller stocked-cask total.

What changes at craft scale is the cost-benefit balance of certain investments.

• Smaller fan plant. Still hall extract for a single 1,000 litre pot still is a much smaller fan and motor than for a five-still continuous distillation operation. The hazardous-area Ex rating is the same; the airflow rate is smaller. The cost premium of Ex-rated equipment over standard equipment scales reasonably.
• Smaller rickhouse load. A 500 cask warehouse at 2 per cent loss is releasing about 1,260 litres of pure ethanol a year, vs 12,600 litres for a 5,000 cask warehouse. Mechanical extract is normally still required at the multi-storey or hot-roof case, but the fan is small.
• Simpler heat recovery economics. Vapour-condenser heat recovery still pays back in three to five years; mash kettle vapour capture less attractive below 100,000 litres of mash a year; CO2 capture not attractive below 1,000 hectolitres of wash a year.
• Visitor centre disproportionately important. For a craft distillery, the visitor centre tasting room and retail is often 30 to 50 per cent of total revenue. The HVAC scope for the visitor centre is therefore proportionally larger than the production-side scope, which is unusual in industrial HVAC and is the most common surprise we see in the engineering brief.
• Cooper shop usually outsourced. At craft scale the on-site cooperage is normally not present; casks are bought finished from a commercial cooperage. The cooper shop HVAC scope drops out of the brief.

The mistake we see most often at craft scale is under-specification of the still hall ethanol detection and the rickhouse extract. The cellar size shrinks but the ethanol release per litre of pure alcohol distilled is identical, and the proportionally small cellar volume means concentrations rise faster, not slower. A 50 hectolitre wash back in a 200 cubic metre room hits 25 per cent of the lower explosive limit of ethanol in roughly 20 minutes of un-vented operation if the still leaks at the lyne arm. Ethanol detection and the Ex-rated extract are non-negotiable at any scale.

20. Field commissioning — what we always test

Commissioning protocol for distillery HVAC handover — our standard field test list, sequenced by zone:

1. Mash room dust collection. Filter pressure differential under design dust loading. Explosion-vent operability check. Spark detector functional test. Bonding and earthing continuity at every duct section.
2. Wash back room CO2. CO2 sensor calibration at three vertical heights. Alarm point verification at 5,000 ppm. Forced lockout point at 15,000 ppm. Emergency power transfer test — the extract fan must continue to run.
3. Still hall ethanol detection. Ethanol sensor calibration at multiple points in the room. Alarm point verification at 25 per cent of the lower explosive limit (8,250 ppm). Forced shutdown of ignition sources on alarm. Cross-zoning verification.
4. Still hall ventilation. Air change rate measured by tracer or by direct face-velocity traverse. Local capture hood face velocity above each still neck. Make-up air verification.
5. Spirit safe room. Air change rate, alarm point, Ex equipment register cross-check against the documented dossier. Bond-audit damper position verification.
6. Cask filling capture. Hood face velocity at the fill head during a representative fill cycle. Ethanol detection at breathing-zone height.
7. Rickhouse extract. Air change rate at low level. Ethanol concentration at multiple monitored points under representative seasonal load. For climate-controlled rickhouse, temperature and humidity band held for at least 72 hours.
8. Cooper shop. Hood face velocity during a representative char cycle. Discharge stack temperature and visible emission against the EPA permit. Fire damper functional test.
9. Bottling hall fill and capping. Hood face velocity at fill head. Ethanol detection at capping station. Displacement ventilation pattern verified by smoke tube.
10. Tasting room cross-contamination. Tracer-gas test confirming no production-air migration into tasting space under worst-case door-opening scenario.
11. Laboratory fume hood. Face velocity traverse across the sash at design opening. Containment test under standard ASHRAE 110 method (where the project specification calls for it).
12. Fire dampers and smoke dampers. Functional test at every compartment penetration. AS 1851 maintenance baseline recorded.
13. Leakage test on classified pressure-class runs. AS/NZS 4254 leakage class verification at the documented test pressure.
14. Ex equipment register. Every motor, fan, damper actuator, sensor and light fitting cross-checked against the dossier and the equipment certificate before energisation.

Handover documents: M-series drawings as installed, material schedule, leakage test certificates, hazardous-area dossier (AS/NZS 60079.10.1 and 10.2), Dust Hazard Analysis report (NFPA 660), AS 1668.2 commissioning record, fire compartment penetration register (AS 1530.4), Ex equipment register, sprinkler clearance register, AS 1851 maintenance baseline, ATO bond drawings cross-referenced.

21. SBKJ machinery for spirit distillery and rickhouse HVAC fabrication

Fabricating the duct schedule for a spirit distillery, rickhouse and bonded warehouse touches the full SBKJ machine range. Below is the per-zone recommendation we work to, with the model designations from the SBKJ Product Catalogue.

SBAL-V auto duct line — 304L stainless variant. The flagship rectangular duct line, output up to 16 metres per minute, drive power 87 kilowatts, coil thickness 0.5 to 1.5 millimetre, maximum duct width 1,500 millimetre, with TDF flange forming integrated. The stainless variant uses hardened tooling and adjusted forming pressures for the work-hardening characteristics of 304L. This is the workhorse for the still hall hazardous-area extract, the spirit safe room HVAC, the cask filling capture, the wash back room extract, the rickhouse extract risers, the cooper shop char and toast extract, the bottling hall fill and capping extract, and the laboratory fume-hood extract. Full SBAL-V specification.

SBAL-V auto duct line — galvanised variant. Same SBAL-V platform configured for G90 galvanised coil. This is the workhorse for the non-classified return air, the office and dry-store HVAC, the tasting room and visitor centre supply and return, the label and carton sections of the bottling hall, and the general make-up air system across the site.

SBAL-III auto duct line. Output 14 metres per minute, drive power 15.7 kilowatts. Mid-range line for smaller distillery projects where the SBAL-V capacity is not required. Particularly common on craft distillery projects fabricating in-house.

SBAL-II auto duct line. Output 18 metres per minute, drive power 5.5 kilowatts. Entry-level line for the very small craft distillery doing in-house fabrication of a limited duct schedule.

SBTF-1500C, SBTF-1602, SBTF-2020 spiral tubeformer. Round spiral duct from 80 to 1,500 millimetre diameter (SBTF-1500C and SBTF-1602) or up to 2,020 millimetre (SBTF-2020), in galvanised or 304L stainless. The long horizontal runs in the rickhouse roof, the bottling-hall roof, the warehouse cross-ties and the office HVAC distribution all use spiral round preferentially. Spiral has lower friction loss and better leakage performance than rectangular for long horizontal runs. Full spiral tubeformer catalogue.

SBEM-1250 elbow former. Pittsburgh-lock elbows up to 1,250 millimetre diameter. The high-volume small-radius elbows that the bottling hall and the still hall layouts normally need.

SBSF-1525 slitting line. 2.5 kilowatt slitting line that feeds master coil into the SBAL-V and the SBTF spiral tubeformer at the throughput rates a distillery project package needs.

SBFB-1500 flange bender. 7.5 kilowatt flange bender at 1.20 metres per minute throughput, for the TDF flange forming on the larger duct sections where the SBAL-V's integrated TDF is not the chosen approach.

SBHF hydraulic press. For the fabricated saddle taps, end caps and bespoke transition pieces that every distillery project needs as one-offs.

SBPC1500 plasma cutter and SBLR-600 / SBLR-600A laser cutter. Sheet cutting for transition pieces, custom fittings, fire-damper assemblies, hood cone-and-collar work and the cooper shop hood plenums. SBLR-600 and SBLR-600A run at 7.6 metres per minute on standard duct sheet thicknesses.

The SBKJ Product Catalogue is the source of truth for every machine specification. We do not substitute alternative numbers in customer quotes. Full SBKJ machine range.

22. Lead time, support and Australian commissioning

For an Australian spirit distillery, rickhouse or bonded warehouse project specifying SBKJ machinery for in-house duct fabrication, the typical timeline is:

• Quotation and engineering review — 1 to 3 weeks. SBKJ engineers from Box Hill North VIC size the line to the buyer's coil specification, output target and factory footprint constraint.
• Build-to-order — 12 to 16 weeks for stainless variant SBAL-V, 10 to 14 weeks for galvanised. Spiral tubeformer and elbow former on similar cycles. Slitting line, flange bender, hydraulic press, plasma and laser cutter shorter at 6 to 10 weeks each.
• Factory Acceptance Test (FAT) — 1 week. Mandatory on every SBKJ machine shipment, run with the buyer's nominated coil.
• Main carriage to Australia — 2 to 4 weeks to Melbourne, Sydney, Brisbane, Adelaide, Fremantle or Hobart. CIF or FOB supported.
• Customs and inland trucking — 1 to 2 weeks. SBKJ supplies all export documentation including HS code declaration, CE certificate, ISO 9001 certificate, FAT signed report and ISPM-15 fumigation certificate for crating.
• Installation, mechanical commissioning, electrical commissioning and operator training — 2 to 6 weeks on site. SBKJ engineers from the Box Hill North VIC office handle Australian commissioning and operator training in English on site.

Total project handover is typically five to seven months from purchase order. After-sales support is 72-hour response via email or video call from Box Hill North VIC, with parts continuity guaranteed for at least 10 years from delivery. Contact SBKJ engineering for an itemised quote.

23. The four highest-leverage decisions on any distillery project

Distillery HVAC projects succeed or fail at four design-stage decisions:

1. Get the hazardous-area dossier finalised before the duct layout is drawn. AS/NZS 60079.10.1 zoning radii drive equipment selection across HVAC, electrical and process. Late changes ripple through every package. Engage the competent person at brief stage, not at tender stage.
2. Engage the Australian Taxation Office bond auditor early. The bond drawings have to show the spirit safe boundary, the cask filling boundary, the rickhouse boundary, the bottling fill-to-cap boundary and the duct penetrations across each one. Get the bond auditor's sign-off on the routing before installation, not after.
3. Get the zone material schedule right. Drawing the boundary between 304L food-zone, 316L chloride-exposed, galvanised non-food and the specialty materials is the largest single capital decision in the duct scope. Get it right at design stage, not after the audit.
4. Size for worst-case batch concurrency, not the average. Every still firing, every wash back active, the cask filling running and the bottling line at full speed all on the same Tuesday is the design case. Average activity is not.

Get an itemised SBKJ quote for your spirit distillery, rickhouse or bonded warehouse project →

FAQ

What hazardous-area zone applies to a whisky pot still hall in Australia?

Under AS/NZS 60079.10.1, the ethanol vapour stream around the lyne arm, condenser and spirit receiver is normally Zone 1, the surrounding still room out to the documented radius is Zone 2, and the wider still hall outside that radius is non-classified provided general ventilation keeps the bulk air below 25 per cent of the lower explosive limit. Final classification must come from a written dossier prepared by a competent person, and every HVAC motor, fan, damper actuator and sensor inside the classified zone must carry matching Ex marking selected for ethanol Group IIB at a temperature class no warmer than T3.

How big is the angels' share evaporation load in a 5,000-barrel rickhouse?

The angels' share runs about 2 per cent of cask contents per year in moderate climates and up to 4 per cent in hot Australian climates. A 5,000-cask warehouse at 200 litres per cask and 63 per cent ABV holds roughly 630,000 litres of pure ethanol. A 2 per cent annual loss is therefore 12,600 litres of pure ethanol vapour released into the warehouse air every year, plus a similar volume of water. The rickhouse ventilation has to dilute that load below the 1,000 ppm 8-hour TWA ethanol exposure standard and below 25 per cent of the lower explosive limit at all monitored points.

Is a heritage Highland-style dunnage warehouse actually unventilated?

Not unventilated, but unconditioned. A traditional dunnage warehouse uses natural ventilation only through louvred vents and door undercuts. There is no mechanical heating, cooling or humidification. For modest cask counts in a cool climate it works safely because the ethanol evaporation rate per square metre is low. Once you stack casks higher, build multi-storey or move into a hot inland climate, the passive scheme stops dispersing ethanol fast enough and a designed mechanical ventilation system becomes mandatory.

What is a spirit safe and why does it have a separate HVAC regime?

A spirit safe is a sealed brass-and-glass instrument enclosure through which new-make spirit runs as it leaves the still. Under Australian Taxation Office bonded-distillery rules the safe is locked and access is restricted. The HVAC regime around it differs from the rest of the still hall: the room must be ventilated to keep ethanol below the exposure standard, but the safe itself is sealed, the room is restricted-access for tax compliance, and the vapour leakage profile is small and steady. Six to ten air changes per hour with low-level extraction and Ex-rated equipment is the normal scope.

Does grain dust in a distillery mash room count as combustible dust?

Yes. Malted and unmalted grain dust is combustible under NFPA 660 with Kst typically 50 to 200 bar metres per second (St-1 class). The Australian framework AS/NZS 60079.10.2 dust hazardous-area, AS 1668.2 ventilation and AS/NZS 4360 risk management all require a Dust Hazard Analysis covering receiving, milling and transfer. Mill enclosures need isolated explosion venting, spark detection upstream of the dust collector, conductive bonded and earthed ductwork and rotary valve isolation.

What duct material should I specify for rickhouse extraction?

304L stainless (1.4307) as the baseline. Galvanised duct is acceptable in cooler dry climates with modest evaporation rate and short duct runs, but Australian rickhouses run hotter than Speyside or Islay so galvanised life is materially shortened. For coastal sites or chloride-exposed areas (Tweed Valley, Beenleigh and Bundaberg, coastal Tasmania) step up to 316L. The ducted fan wheel must be non-sparking, the motor must be Ex-rated for ethanol Group IIB temperature class T3, and the entire duct system must be electrically bonded and earthed.

How does a climate-controlled rickhouse differ from a passive dunnage warehouse?

A climate-controlled rickhouse actively conditions the warehouse to about 14 to 22 degrees Celsius and 75 to 85 per cent RH with deliberate gentle seasonal swing. The HVAC scope expands to chilled water and hot water coils, humidifiers, dehumidifiers, sensible reheat, dedicated outdoor air for ethanol dilution, and a control system that holds the band without forcing the air below 25 per cent of the lower explosive limit. A passive dunnage warehouse has none of that — only natural ventilation, monitoring sensors and fire detection. The capital cost difference is large; the maturation profile difference is the reason distillers choose one over the other.

What is the lead time for SBKJ duct machinery into an Australian distillery or rickhouse project?

For an SBAL-V auto duct line in 304L stainless variant, plan 12 to 16 weeks build-to-order from PO to bill of lading, 2 to 4 weeks main carriage to Melbourne, Sydney, Brisbane, Adelaide, Fremantle or Hobart, and 2 to 6 weeks installation and commissioning on site. Total handover is typically five to seven months from PO. The galvanised SBAL-V variant runs shorter at 10 to 14 weeks. SBKJ engineers from the Box Hill North VIC office handle Australian commissioning and operator training in English on site.