Elevator, Lift, Escalator & Travelator Manufacturing & Assembly HVAC Duct Guide

1. Why lift and escalator manufacturing HVAC is its own engineering discipline

A vertical-transport factory is a deceptively diverse industrial building. From the outside it looks like a steel-fabrication and assembly shed; on the inside it runs nearly every metalworking and finishing process in the catalogue, often within a few bays of one another. In a single Australian plant building lifts, escalators or travelators you can find a robot welding a stainless car shell in one corner, a structural team laying long weld passes into an escalator truss in the next bay, a guide-rail machining line throwing oil mist down the wall, a powder-coat booth and a 190 °C cure oven behind a fire wall, a polishing crew bringing a cabin door up to a mirror finish, an electronics bench soldering controller boards, a hydraulic power-pack fill station, and a tall load-test tower where a finished car is run against its rated load. Each of those processes has a different dust load, a different fume chemistry, a different ignition risk, a different hazardous-area classification and a different duct material requirement. HVAC ductwork inside a lift and escalator plant is not a commodity item bought by the metre — it is a process-engineering problem that touches AS/NZS 1554 welding fume, AS 3957 combustible dust, AS/NZS 60079 hazardous-area classification, AS 1940 flammable-liquid handling, AS 1375 industrial-oven safety, AS 4024 machinery safety and the AS 1735 lift-construction context, all inside the same building envelope.

This guide writes against the Australian vertical-transport manufacturing sector as it actually operates in 2026. The structure of the industry shapes the HVAC. Most of the global lift original-equipment manufacturers — Otis Australia, KONE Australia, Schindler Australia and TK Elevator Australia — run Australian operations that assemble, customise, fit-out, modernise and maintain rather than cast and machine from raw billet. Their local labour concentrates on cabin and car fabrication, architectural fit-out, door and frame assembly, controller integration and field service, with major mechanical components imported and finished here. That means their Australian HVAC stack is dominated by cabin sheet-metal and stainless weld-fume LEV, powder-coat and touch-up paint ventilation, stainless polishing-dust capture and load-test-tower ventilation, with comparatively little heavy machining on the floor. The Australian-owned manufacturers and specialists carry deeper local fabrication: Liftronic, an Australian-owned company in Sydney, and Shotton Lifts, a Melbourne-based Australian manufacturer, build cabins and cars and integrate complete units; Easy Living Home Elevators, an Australian business on the Gold Coast in Queensland, builds compact residential lifts; and Southern Lifts, Electra Lift, Express Lifts, Premier Lifts, Residential Lift Company and Compass/Surelift cover the residential and light-commercial segment with their own fabrication and assembly floors.

Layered on top of the lift makers is a tier of architectural cabin fit-out fabricators — specialist shops that build the visible interior of the car in brushed and mirror stainless, glass, timber laminate, solid-surface and stone. These shops cluster in the industrial belts of Western Sydney and Smithfield in New South Wales, Dandenong and Mulgrave in Victoria, the Gold Coast and Brisbane in Queensland, and Perth in Western Australia, and they run their own concentrated weld, grind, dust, paint and adhesive-VOC profiles. The escalator and travelator side of the sector is smaller in unit count but heavier per unit: trusses are large structural-steel weldments, steps and step chains are machined and assembled, and the balustrade and decking are sheet-metal and glass fabrication. Across all of it, the demand-side trend is structural and durable — high-rise residential and commercial construction in the eastern-seaboard capitals, mandated accessibility under the National Construction Code and the Disability Discrimination Act access provisions referenced through AS 1428.1, an ageing population driving home-lift adoption, and a deep modernisation backlog on the installed base — all of which keep the local fabrication and fit-out floors busy and keep new and replacement HVAC infrastructure on the capital plan.

Across this entire sector, vertical-transport factory ductwork has to manage five simultaneous demands. Welding-fume capture and carcinogen control: mild-steel and stainless cabin and truss welding generates manganese, iron oxide, ozone and — on stainless — hexavalent chromium Cr(VI) at a workplace exposure standard of 0.0003 mg/m³, one of the lowest limits in the Australian standard. Combustible-dust deflagration resistance: stainless and aluminium grinding and polishing dust, and electrostatic powder-coat overspray, are combustible dusts under AS 3957 demanding AS/NZS 60079 zoning, conductive bonded ductwork and NFPA 68/69 deflagration protection on the collector. Flammable-liquid and isocyanate control: two-pack polyurethane touch-up paint releases isocyanate at a WES of 0.02 mg/m³ and turns the booth into an AS 1940 flammable-liquid hazardous area. High-temperature service: the powder-coat cure oven at 180–200 °C is an industrial oven under AS 1375 with its own exhaust riser. And clean tempered make-up air: every cubic metre extracted from a weld bay, booth, oven or polishing cell must be replaced with filtered, controlled-velocity supply air under AS 1668.2 and NCC Section J energy provisions to keep the production zones balanced and the office, electronics and test areas comfortable. Each is manageable in isolation; together they explain why a generic commercial fabricator treating a lift factory as just another industrial job under-quotes the first project and walks away from the second.

This guide walks every major process zone of a lift, escalator and travelator plant and explains what changes about the ductwork. We start with the regulatory backbone, then map the factory process by process from cabin fabrication through finishing and test, then close with the SBKJ machine configuration that gives an Australian fabricator the production envelope to serve this market from Box Hill North VIC across the country.

2. The Australian regulatory stack — AS 1668, AS 4254, AS/NZS 1554, AS 1940, AS 3957, AS/NZS 60079, AS 1375, AS 4024, AS 1735, AS 1428.1 and NCC Section J

Vertical-transport manufacturing HVAC in Australia sits at the intersection of more than two dozen overlapping standards and codes. Ignoring any one of them is a notice of non-compliance from SafeWork Australia, the state work-health-and-safety regulator, the state environment protection authority, or the building certifier, waiting to happen. The stack splits into mechanical-ventilation and building-code compliance, occupational-health exposure compliance, welding-process and fume control, flammable-liquid and dust safety, hazardous-area electrical compliance, industrial-oven safety, machinery safety, and the lift-construction and accessibility context that frames the whole product.

2.1 AS 1668.2 — mechanical ventilation and the dilution backbone

AS 1668.2 is the umbrella mechanical-ventilation standard for Australian buildings and the dominant reference for the dilution and make-up-air side of a lift factory. A manufacturing plant is an NCC Class 8 industrial occupancy; AS 1668.2 sets minimum extract rates for metal handling, machining, grinding, welding and painting operations and provides the contaminant-dilution framework that sits over the top of localised exhaust ventilation (LEV) at each individual source. In practice an active welding and finishing plant never gets close to the building-volume minimum — LEV at every weld station, polishing bench, paint booth and oven drives total extract well above the dilution figure. Where AS 1668.2 matters most is make-up air: every cubic metre extracted from a weld bay, powder booth, cure oven, polishing cell or test tower must be replaced with tempered, filtered, controlled-velocity supply air, keeping production zones balanced and preventing cross-contamination into the electronics, test and office areas. AS 1668.2 also incorporates the workplace exposure standard framework that ties LEV capture and duct sizing back to each contaminant’s WES.

2.2 AS 1668.1 — fire and smoke control

AS 1668.1 governs the use of ventilation and air-conditioning systems for fire and smoke control. In a lift and escalator plant it matters at two points. First, the high-bay load-test tower: a tall test shaft is effectively an atrium, and its smoke-management and make-up-air provisions follow AS 1668.1 in coordination with the building’s fire-engineering strategy. Second, any ductwork that penetrates a fire-rated boundary — for example between the powder-coat and paint hall and the rest of the factory — must integrate fire and smoke dampers per AS 1668.1 and AS 1682, with the duct penetration itself fire-rated per AS 1530.4.

2.3 AS 4254.1 and AS 4254.2 — sheet-metal and flexible duct construction

AS/NZS 4254.1 (rigid sheet metal) and AS/NZS 4254.2 (flexible) govern duct construction across the normal pressure ranges — low pressure to 500 Pa, medium to 1000 Pa and high to 2500 Pa. The great majority of a lift factory’s ductwork — weld-fume LEV, powder-coat extract, polishing-dust mains, oil-mist mains, supply air and general extract — sits inside AS 4254 ranges and is constructed to its gauge, reinforcement and sealing tables. The cure-oven high-temperature exhaust riser runs beyond AS 4254 in its hot section and needs purpose-engineered construction; AS 4254 picks up again on the cool side downstream of the oven’s cooling and dilution zone.

2.4 AS 1530.4 — fire resistance of building elements

AS 1530.4 covers fire-resistance testing of building elements, including fire-rated ductwork penetrations through fire compartments. In a lift factory this matters at every penetration between the higher-hazard zones — the powder-coat and paint hall, the solvent store, the dust-collector compound — and adjacent office, electronics, test and evacuation areas. The duct penetration must meet the fire-resistance level called by the building’s NCC approval, with fire dampers complying with AS 1682 and the surrounding wall or floor assembly maintaining its rated integrity.

2.5 AS/NZS 1554.1 and AS/NZS 1554.6 — structural steel and stainless welding

The AS/NZS 1554 series governs the welding itself, and it drives the fume chemistry the LEV has to handle. AS/NZS 1554.1 covers welding of steel structures — the standard for escalator and travelator truss fabrication, guide-rail brackets, car frames and structural sub-assemblies in mild and low-alloy steel, where the fume is dominated by iron oxide and manganese. AS/NZS 1554.6 covers welding of stainless steel — the standard for stainless car shells, doors, ceilings and architectural cladding, where the fume carries hexavalent chromium Cr(VI) and nickel in addition to the general weld-fume burden. The welding standard sets the process, consumable and qualification requirements; the HVAC engineer reads the consumable and parent-metal chemistry out of the welding procedure to size the extraction for the worst-case contaminant.

2.6 AS 1940 — storage and handling of flammable and combustible liquids

AS 1940 governs flammable and combustible liquids in Australian workplaces. A lift factory triggers AS 1940 at the wet-paint and two-pack touch-up booth (solvent-borne paints and thinners are Class IB/IC flammable liquids), the solvent and adhesive store, the cabin-fit-out adhesive and contact-cement stations, and any cleaning-solvent bench. Each point needs bunded containment, a dedicated LEV branch, segregated storage and AS/NZS 60079 hazardous-area zoning around the immediate work area. The interaction with the paint extract is direct: the booth airflow, duct material and electrical equipment all follow from the AS 1940 classification of the coatings in use.

2.7 AS 3957 — dust hazard areas, the critical combustible-dust standard

AS 3957 is the Australian dust-hazard standard and one of the most directly applicable single documents for a lift-factory duct designer. It covers combustible-dust deflagration risk — electrostatic powder-coat overspray, stainless and mixed-metal grinding and polishing dust, aluminium polishing fines (a reactive combustible metal), and the timber and laminate dust from cabin fit-out. AS 3957 mandates hazard-area zoning (Zone 20 for continuous explosible-dust concentration, Zone 21 for occasional, Zone 22 for unlikely) and drives the AS/NZS 60079.10.2 electrical-equipment selection downstream. For the duct designer, AS 3957 forces the questions that set collector and duct topology: at each dust collection point, what is the explosibility of the dust, what is the minimum ignition energy, what is the deflagration index Kst, and what is the engineered deflagration-protection chain — vent panels per NFPA 68, inerting or suppression per NFPA 69, isolation valves — between the collector and the inbound duct? The answer drives collector selection, isolation-valve placement and the bonding and grounding of every metre of duct in the dust-laden circuit.

2.8 AS/NZS 60079 — explosive atmospheres and hazardous-area classification

AS/NZS 60079 is the hazardous-area-classification standard, triggered in a lift factory at multiple locations under both the dust part (AS/NZS 60079.10.2) and the gas/vapour part (AS/NZS 60079.10.1):

• Zone 20 / 21 / 22 (dust): the interior of a powder-coat recovery cyclone and powder hopper, the immediate area around an open polishing or linishing operation, and the general powder-handling and grinding areas around the equipment.
• Zone 1 (gas/vapour): the wet spray-paint and two-pack booth interior during spraying, the solvent and contact-adhesive store, and the immediate area around an open solvent bath.
• Zone 2 (gas/vapour): the general paint hall and the area around the cabin-fit-out adhesive bench in normal operation.

AS/NZS 60079 drives Ex-rated electrical equipment for fans, motors, duct-mounted sensors and lighting in or near the affected zones. The ductwork itself must be conductive throughout (galvanised steel is conductive; 316L stainless is the default where corrosion or cleanability also matters), continuously bonded with conductive flange gaskets at every joint, externally bonded to the building earth grid, and pressure-tested with documented earth-resistance verification — less than 1 ohm to ground at every section — at commissioning.

2.9 AS 1375 — industrial fuel-fired appliances and the cure oven

AS 1375 is the code of practice for the safe use of industrial fuel-fired appliances and is the governing reference for the powder-coat cure oven running at 180–200 °C and for any heat-treat or stress-relief oven serving guide-rail and structural components. AS 1375 drives the oven-exhaust topology: a purge cycle before the burner lights, lower-explosive-limit (LEL) monitoring on the gas-fired burner, a dedicated exhaust riser separate from the general factory extract, explosion-relief provision on the oven shell, and a burner-management system with flame supervision. The exhaust riser is fabricated in heavy-gauge aluminised steel or high-temperature stainless for the hot section, transitioning to standard construction downstream of the cooling zone.

2.10 AS 4024 — machinery safety

The AS 4024 series covers safety of machinery and is relevant to the ductwork in two ways: the guarding and safe-access requirements for the machines that the LEV serves (CNC machining centres, grinders, polishing benches, press brakes), and the access provisions for the ductwork itself — inspection ports, cleaning access and safe working at height for duct maintenance must be designed in line with AS 4024 access and guarding principles. Duct-mounted dampers, isolation valves and access doors are positioned so that maintenance does not require entry into a machine guard zone.

2.11 AS/NZS 1715 and AS/NZS 1716 — respiratory protective equipment

AS/NZS 1715 sets the framework for selection, use and maintenance of respiratory protective equipment (RPE) and AS/NZS 1716 sets the equipment standards. LEV is the primary control; RPE is the backstop where capture cannot guarantee the breathing zone stays below the WES. For stainless welding (Cr(VI)) and metal polishing, powered air-purifying respirators (PAPR) with particulate filters are the practical selection, with documented fit-testing under AS/NZS 1715. For two-pack paint spraying, air-fed respirators are required because organic-vapour cartridges cannot be relied on against isocyanate. RPE selection is documented per task and integrated into the ISO 45001 work-health-and-safety system alongside the LEV maintenance and air-monitoring records.

2.12 AS 1735 and AS 1428.1 — the lift-construction and accessibility context

AS 1735 is the Australian lifts, escalators and moving-walks construction standard — the product standard the entire factory exists to satisfy. It does not specify factory HVAC, but it frames what is being built and therefore what processes the HVAC must serve: car and counterweight construction, guide-rail installation, machine and drive specification, and the dimensional and safety requirements of the finished car. AS 1428.1 covers design for access and mobility and is referenced through the National Construction Code and the Disability Discrimination Act access provisions to mandate accessible lifts in new and upgraded buildings — a major demand driver for the residential and light-commercial lift makers (Easy Living Home Elevators, Residential Lift Company, Compass/Surelift and others). The accessibility mandate and the ageing-population trend keep the home-lift and accessible-lift production floors active, and those floors carry the same cabin weld, grind, paint and fit-out HVAC demand as their commercial counterparts at smaller scale.

2.13 NCC Section J, ASHRAE 62.1 and the ISO management systems

NCC Section J sets the energy-efficiency provisions for the building, including the fan power, duct insulation, heat-recovery and economy-cycle expectations that bear directly on how the make-up-air and general-ventilation system is designed and how much it costs to run. ASHRAE 62.1 is the international ventilation-for-acceptable-indoor-air-quality reference frequently cited alongside AS 1668.2 for the office, electronics and meeting areas. ISO 9001 (quality), ISO 14001 (environmental) and ISO 45001 (occupational health and safety) are the management-system standards under which the manufacturer documents its LEV maintenance, air-monitoring, emissions-licence compliance and duct-traceability records. The HVAC fabricator’s mill certificates, pressure-test records and bonding verifications feed directly into the ISO 9001 and ISO 45001 evidence base.

2.14 SafeWork Australia workplace exposure standards — the chemistry-driven sizing inputs

SafeWork Australia’s workplace exposure standards (WES) are the regulatory inputs that drive LEV capture velocity and duct sizing across a lift, escalator and travelator factory. The relevant standards are:

• Hexavalent chromium Cr(VI): 0.0003 mg/m³ (0.3 µg/m³) TWA — from stainless car-shell and door welding (AS/NZS 1554.6), stainless grinding and polishing, and pickling/passivation. IARC Group 1 confirmed human carcinogen and THE design-driving contaminant of the stainless cabin shop.
• Manganese: 1 mg/m³. From mild-steel and stainless welding electrodes and wire — car frames, truss welding, brackets.
• Weld fume (not otherwise classified): general welding-fume burden, kept as low as reasonably practicable.
• Iron oxide: 5 mg/m³. The bulk fume mass in mild-steel truss and frame welding.
• Nickel (inhalable): 1 mg/m³; insoluble compounds lower. From stainless welding fume and stainless grinding.
• Ozone (O3): 0.1 ppm STEL. From GMAW/GTAW arc plasma, heaviest on aluminium and stainless arcs.
• Oil mist: 5 mg/m³. From guide-rail, traction-machine, sheave, gear and step-chain machining with neat or soluble cutting fluid.
• Isocyanate (TDI/MDI/HDI): 0.02 mg/m³. From two-pack polyurethane wet paint on cabins, doors and frames. Potent respiratory sensitiser — THE killer of the wet-paint booth.
• Xylene: 80 ppm. Paint and thinner solvent vapour on the wet-spray extract; toluene and other aromatics ride alongside.
• Rosin / colophony (solder flux): respiratory sensitiser, no single numeric WES — reduce as low as reasonably practicable. From controller and electronics soldering.
• Carbon monoxide (CO): 30 ppm. From welding arcs, gas-fired ovens and any combustion appliance.
• Carbon dioxide (CO2): 5000 ppm. Indoor-air-quality marker; rises in poorly ventilated assembly and test areas and sets the fresh-air make-up benchmark.
• Respirable crystalline silica (RCS): 0.05 mg/m³. From stone and solid-surface cabin-interior cutting in the fit-out shops.
• Inorganic lead: low inhalable limit. From legacy leaded-solder rework on the electronics bench.
• Powder-coat polymer dust: combustible-dust inhalable cap plus deflagration hazard under AS 3957. From the powder booth and recovery cyclone.

Every dust and fume LEV branch in the factory must keep the operator’s breathing-zone air below the relevant WES. Where multiple contaminants are present on one source — Cr(VI) plus nickel plus manganese at a stainless welding station — the additive-mixture rule applies and the LEV is sized to the lowest practical fraction, which on stainless work is invariably the Cr(VI) figure. That single calculation drives capture velocity, transport velocity, branch sizing and main sizing across the whole plant.

3. Cabin and car sheet-metal fabrication — weld fume, manganese and stainless Cr(VI) LEV

The lift car is the heart of the product and the dominant fabrication task in most Australian plants. A car shell is a sheet-metal weldment — the floor pan, side panels, rear wall, ceiling frame, toe-guard and door panels welded, spot-welded and folded into a rigid box, then clad and trimmed. Mild and zinc-coated steel car shells are welded to AS/NZS 1554.1; stainless car shells and stainless cladding are welded to AS/NZS 1554.6. The welding processes are GMAW (MIG) for the main shell and seams, GTAW (TIG) for visible architectural welds, and resistance spot welding for panel-to-frame attachment. Each process has a distinct fume signature, and on stainless every one of them generates hexavalent chromium.

On mild and zinc-coated steel, the fume is dominated by iron oxide (WES 5 mg/m³) and manganese (1 mg/m³), with ozone (0.1 ppm) and carbon monoxide (30 ppm) at the arc and zinc oxide fume where the steel is galvanised. On stainless the picture changes fundamentally: hexavalent chromium Cr(VI) appears at a workplace exposure standard of 0.0003 mg/m³, roughly two orders of magnitude below the general weld-fume figure, accompanied by nickel (1 mg/m³ inhalable). Cr(VI) is an IARC Group 1 confirmed human carcinogen with no safe exposure level, so the design objective on a stainless welding station is not merely to stay under a number but to drive the breathing-zone concentration as close to zero as the LEV physically can. This single contaminant is the reason a cabin shop’s extraction is engineered to a far higher standard than a general fabrication shed.

The practical control hierarchy on a cabin welding station is source capture first, dilution second, RPE as backstop. Source capture means on-tool extraction integrated into the MIG torch, or an at-arc capture hood or fume arm positioned within 150–300 mm of the weld pool, at a capture velocity of 0.5–1.0 m/s at the arc. For repetitive robot welding of car shells, fixed capture hoods or an enclosed and extracted robot cell give the most reliable Cr(VI) control. The captured fume is carried in a 316L stainless extraction main at 15–20 m/s transport velocity — stainless rather than galvanised because the stream is corrosive and the duct must be cleanable and conductive for hazardous-area continuity — to a cartridge or baghouse collector with HEPA polish before discharge. Over the top of source capture, AS 1668.2 dilution and tempered make-up air keep the general bay concentration low and replace the extracted volume. RPE under AS/NZS 1715/1716 (PAPR with particulate filters, fit-tested) is the documented backstop, and quarterly NATA-certified breathing-zone air sampling against the Cr(VI) and manganese WES verifies that the engineered controls are working.

The duct material decision is unusually important here. Galvanised steel, the workhorse of commercial HVAC, is the wrong choice for stainless-weld-fume and pickling-fume extraction: the fume and any acid carry-over from passivation attack the zinc, and the duct must be cleanable for periodic Cr(VI) deposit removal. 316L stainless fabricated on the SBAL-V with a continuously TIG-welded seam on the SBSF-1525 is the correct envelope — hermetic, corrosion-resistant, conductive and cleanable. For the general mild-steel weld-fume bays where Cr(VI) is not present, galvanised or aluminised construction is acceptable and cost-effective, but the two streams are kept on separate collectors so that the Cr(VI) circuit can be managed and monitored as the carcinogen stream it is.

4. Guide-rail and structural-steel machining and cutting — oil mist, cutting fluid and plasma fume

Guide rails are the precision spine of a lift: machined steel T-sections, drawn or cold-rolled and then machined at the ends for fishplate joints and bracket fixing. Structural sub-assemblies — car frames, sling members, counterweight frames and bracketry — are cut, drilled and machined from steel section and plate. The Australian OEM assembly plants do relatively little of this (rails and major structure are commonly imported finished), but the Australian-owned manufacturers and the heavier fit-out shops run rail-end machining, drilling lines and structural cutting on the floor.

Machining with neat cutting oil or water-soluble coolant generates oil mist and coolant aerosol at a workplace exposure standard of 5 mg/m³. The hazard is threefold: inhalation of the aerosol, condensation of oil mist onto roof steel and ductwork as a slip-and-fire hazard, and bacterial endotoxin carried in soluble-coolant aerosol. The correct control is to enclose the machining centre, lathe or rail-end station and exhaust the enclosure through a dedicated oil-mist collector — a centrifugal or electrostatic mist eliminator backed by a fine after-filter — mounted at the machine, rather than ducting raw mist across the factory. Where a central oil-mist main is unavoidable it is fabricated in 316L stainless or aluminised steel with deliberate drainage falls and condensate drain points, because the duct runs wet with condensed oil; transport velocity of 10–15 m/s suits the aerosol.

Cutting introduces a second contaminant family. Plasma and laser cutting of plate and section — for car frames, brackets, escalator truss components and decking — generates metallic fume and fine particulate rather than oil mist, dominated by iron oxide and, on stainless, Cr(VI). A plasma or laser cutting table is fitted with a downdraught extraction bed zoned to the active cutting area, ducted to a baghouse at 15–20 m/s transport velocity. Dry grinding of hardened rail faces and machined components shifts the contaminant again, from oil mist to combustible metal dust, and that source belongs on the grinding-and-polishing dust circuit covered later, not on the oil-mist main. Keeping these three machining-related streams — oil mist, cutting fume and dry metal dust — on the correct dedicated circuits is a recurring discipline in lift-factory HVAC, because mixing them creates either a wet-and-dry blockage problem or an oil-plus-hot-metal ignition problem.

5. Powder coating and spray paint — combustible dust, isocyanate and AS 1940

Finishing is where a lift cabin earns its appearance, and electrostatic powder coating is the dominant finishing process for cabins, landing doors, car doors, frames, fascias, sills and balustrade panels. Wet spray paint — including two-pack polyurethane — is reserved for touch-up, specialty colours, low-volume architectural finishes and substrates that cannot be powder-cured. The two processes pose different ventilation problems and are best understood separately.

5.1 The powder-coat booth, cyclone and after-filter

Electrostatic powder is applied in a spray booth, oversprayed powder is recovered in a cyclone for re-use, and the fine fraction is captured on a cartridge after-filter. Airborne powder is a combustible dust under AS 3957, so the entire powder train — booth, cyclone and after-filter — is a dust hazardous area under AS/NZS 60079.10.2. Booth face velocity across the opening is typically 0.5–0.7 m/s, enough to contain powder without disturbing the electrostatic deposition pattern. The deflagration-protection chain follows NFPA 68 (vent panels) and NFPA 69 (suppression or inerting) on the cyclone and after-filter, with explosion-isolation between the collector and any return duct. The booth and cyclone extract ductwork is conventionally galvanised or aluminised steel, conductively bonded and earthed to under 1 ohm so that static cannot accumulate on the powder-laden duct surface. Powder-booth ductwork is kept entirely separate from any wet-paint, oil-mist or hot-grinding stream.

5.2 The cure oven at 180–200 °C

After powder application the part passes through a cure oven at 180–200 °C. The oven is an industrial fuel-fired appliance under AS 1375, requiring a purge cycle before the burner lights, LEL monitoring on the gas-fired burner, explosion-relief on the oven shell, and a dedicated high-temperature exhaust riser separate from the general factory extract. The oven exhaust carries the volatiles driven off the curing powder and the products of combustion; the riser is fabricated in heavy-gauge aluminised steel or 309/310S high-temperature stainless for the hot section, transitioning to standard construction downstream of the cooling zone. The exhaust riser is a natural location for heat recovery — recovering oven exhaust heat to pre-temper make-up air is an effective NCC Section J energy measure on a high-throughput powder line.

5.3 Wet spray, two-pack and the isocyanate problem

Where wet paint is used, isocyanate from two-pack polyurethane drives the entire ventilation design. The SafeWork Australia WES for isocyanates (TDI, MDI and HDI) is 0.02 mg/m³, and isocyanates are potent respiratory sensitisers: once a worker is sensitised, even trace exposure can trigger occupational asthma. The wet-spray booth is a flammable-liquid hazardous area under AS 1940 and AS/NZS 60079.10.1 (Zone 1 during spraying), with xylene (WES 80 ppm), toluene and other solvent vapours on the same extract. Booth design uses a controlled cross-draught or downdraught at 0.5 m/s face velocity through a water-wash or dry-filter back wall, ducted to a stack with the solvent and isocyanate load. Crucially, isocyanate cannot be reliably captured by organic-vapour respirator cartridges, so air-fed respirators are mandatory for the sprayer regardless of how good the booth ventilation is. The wet-paint and isocyanate extract is best fabricated in 316L stainless for cleanability and solvent/corrosion resistance, and it is kept on its own collector and stack separate from the powder circuit.

6. Stainless grinding, polishing and linishing — metal-dust LEV and combustible metal dust

Architectural cabin finishes — satin, brushed, hairline and mirror stainless — are produced by grinding, linishing and polishing the welded car shell, doors, ceilings and trims. This is one of the most under-appreciated hazards in a lift factory because it generates a contaminant that is simultaneously a respiratory hazard, a carcinogen carrier and a combustible-dust deflagration hazard.

The dust from stainless finishing contains iron oxide (WES 5 mg/m³), nickel (1 mg/m³), cobalt where present in the alloy or the abrasive, and — critically — hexavalent chromium Cr(VI) at 0.0003 mg/m³, generated by thermal oxidation at the abrasive contact point where local temperatures are high enough to convert chromium to its hexavalent state. The dust is fine, it is electrostatically active, and it accumulates inside ductwork and collectors. Below a critical particle size it becomes a deflagration hazard under AS 3957 and AS/NZS 60079.10.2 — a dry collector handling fine stainless dust must be protected by NFPA 68 venting and NFPA 69 isolation. Where aluminium cabin trims, doors or decorative elements are polished, the aluminium fines are a reactive combustible metal in their own right and demand a wet-bath collector, because aluminium dust is water-reactive when burning and far more energetic than ferrous dust.

The correct topology is a dedicated downdraught or backdraught polishing bench — or, for high-volume work, a fully enclosed and extracted linishing cell — with a capture velocity of 0.7–1.0 m/s at the work. The dust is carried in a heavy-gauge 316L stainless main at 18–22 m/s transport velocity, high enough to keep the fine metal dust entrained without dropout in horizontal runs and at elbows. For mixed stainless and ferrous dust a wet collector is the safe default; where a dry cartridge collector is used it carries full NFPA 68/69 deflagration protection and explosion-isolation back to the duct. This stream must never share ductwork with the weld-fume circuit (hot particulate) or the paint circuit (oily overspray), because combining a fuel (combustible dust) with an oxidiser-rich oily film or a hot-particle ignition source is the textbook recipe for a duct or collector deflagration. Round spiral 316L duct from the SBFB-1500, continuously welded on the SB-ZF1500 for the combustible-dust mains, is the standard construction for the polishing circuit.

7. Escalator and travelator truss welding — heavy structural weld fume

Escalators and travelators are built around a truss — a long welded structural-steel lattice girder that supports the step or pallet band, the drive, the handrail and the balustrade. A commercial escalator truss spans a single storey; heavy-duty transit, airport and shopping-centre units run long inclined or horizontal trusses that are large, heavy weldments. Truss fabrication is structural welding to AS/NZS 1554.1, predominantly GMAW on mild and low-alloy structural steel, laying large volumes of weld metal in long continuous passes — a fundamentally different fume problem from compact cabin welding.

The fume burden on truss welding is dominated by iron oxide (5 mg/m³) and manganese (1 mg/m³) because of the sheer mass of mild-steel weld metal deposited, plus the general weld-fume not-otherwise-classified figure, with carbon monoxide (30 ppm) and ozone (0.1 ppm) at the arc. The challenge is geometric: a truss is large, the welder moves continuously along its length, and the work cannot be brought to a fixed extraction hood the way a cabin panel can. On-tool extraction helps but cannot follow every weld on a multi-metre girder. The practical Australian solution combines two layers. First, high-volume low-velocity (HVLV) overhead canopy extraction or a push-pull ventilation system across the truss welding bay, capturing the rising fume plume over the whole work area and ducting it to a central baghouse. Second, mobile high-vacuum on-torch or fume-arm extraction at the active arc for source capture where the welder is working. Because truss bays are tall and open, AS 1668.2 dilution ventilation and tempered make-up air carry as much of the load as source capture, and the heavy continuous weld deposition means the transport velocity in the baghouse main must hold 15–20 m/s to keep particulate entrained over long horizontal runs. The mains are typically galvanised or aluminised steel because mild-steel weld fume is not corrosive in the way stainless fume is, with the heavy-gauge SBAL-III line producing the large canopy and baghouse-inlet ductwork.

8. Traction-machine, gear, sheave and step-chain machining — oil mist and swarf

The mechanical heart of a geared or gearless lift — the traction machine, the sheaves, the gearbox where fitted, the brake assembly — and the drive components of an escalator — the step chains, drive sprockets and step axles — are machined castings and forgings. The Australian OEM plants import most of these finished, but the Australian-owned manufacturers and the specialist drive shops machine and assemble them locally, and modernisation work involves machining and refurbishment of legacy components.

Machining traction-machine and gear components on lathes, machining centres, gear hobbers and surface grinders generates oil mist and coolant aerosol (WES 5 mg/m³) and produces swarf that must be cleared, contained and recycled. The ventilation control mirrors the guide-rail machining case: enclose the machine and exhaust the enclosure through a machine-mounted oil-mist collector (centrifugal or electrostatic mist eliminator with fine after-filter), with any central oil-mist main fabricated in 316L stainless or aluminised steel with drainage falls and condensate drains. Gear-cutting and hard-turning of hardened components generate fine metal particulate as well as mist; where dry grinding of hardened gear teeth or brake surfaces occurs, that dry-dust source moves onto the grinding-dust circuit with its combustible-dust controls. Swarf handling is a housekeeping and fire-control matter rather than an airborne one, but oily swarf accumulation under machines is an ignition-load issue that the factory’s fire-engineering and AS 1940 housekeeping provisions address. Transport velocity of 10–15 m/s suits the oil-mist mains; the machining cells are a relatively contained, well-understood part of the HVAC stack compared with the open weld and grind bays.

9. Cabin fit-out — timber, laminate, glass and adhesive VOC

The visible interior of a lift car — the wall panels, handrails, ceiling, lighting cove, flooring and mirrors — is built and installed by cabin fit-out, often in a dedicated area or by a specialist fit-out fabricator. Materials range across timber and timber laminate, high-pressure laminate, solid-surface and stone, glass and mirror, and stainless and aluminium trim. Each material brings its own contaminant.

Timber and laminate cutting, routing and sanding generate wood and laminate dust — a respiratory hazard and, in fine accumulated form, a combustible dust under AS 3957. Wood-dust LEV uses hooded capture at saws, routers and sanders at 0.7–1.0 m/s, ducted in galvanised or 316L spiral at 18–22 m/s to a baghouse or cyclone-plus-baghouse collector; high-pressure laminate dust is treated the same way. Stone and solid-surface cutting introduce respirable crystalline silica (RCS) at a workplace exposure standard of 0.05 mg/m³ — one of the most tightly regulated dusts in Australia following the engineered-stone reforms — demanding wet-cutting where possible plus dedicated high-efficiency LEV, and a duct and collector arrangement that keeps the fine silica out of the breathing zone. Glass and mirror cutting is primarily a wet-edge process with limited airborne dust but with its own handling controls. The adhesives and contact cements used to bond panels and laminates release VOC solvents; the adhesive bench needs a dedicated LEV branch and AS 1940 segregated storage, and the solvent vapour places the immediate area in an AS/NZS 60079 Zone 2 classification during use. Cabin fit-out is a multi-contaminant zone where the duct designer has to provide several small dedicated branches — wood dust, silica, solvent VOC — rather than one shared main.

10. Controller and electronics assembly — solder fume and the rosin sensitiser

Every lift, escalator and travelator carries a controller, variable-frequency drive electronics, door operators, call stations, position sensors and fixture PCBs that are assembled, tested, reworked and repaired in an electronics area. Hand soldering, rework and small-batch reflow release rosin (colophony) flux fume, a recognised respiratory sensitiser and one of the leading causes of occupational asthma in electronics manufacturing. Colophony has no single numeric workplace exposure standard in the way a metal does — it is controlled as a sensitiser, meaning exposure must be reduced as low as reasonably practicable rather than merely held under a figure. Where legacy leaded solder is used for repair of older boards, inorganic-lead inhalation control is added.

The control is tip extraction or a benchtop fume-arm hood positioned within 50–100 mm of the iron tip at a capture velocity of about 0.5 m/s, ducted in clean galvanised or 316L stainless to a dedicated electronics-grade filter unit combining HEPA particulate media with activated-carbon gas-phase media to capture both the particulate flux fume and the gaseous organic component. This is a small, clean, low-volume circuit, but it carries two non-negotiable rules. First, it is kept entirely separate from the heavy weld-fume, metal-dust and paint mains — the electronics area is a clean, climate-controlled space and cannot be contaminated by metal dust drawn back through shared ductwork. Second, the make-up air to the electronics area is tempered and filtered to ASHRAE 62.1 indoor-air-quality expectations because it is an occupied, comfort-conditioned space, not a production shed. The electronics LEV is modest in airflow terms but disproportionately important to worker health because the sensitiser exposure is chronic and cumulative.

11. Hydraulic power-pack assembly — hydraulic oil and the residential-lift case

Hydraulic lifts — common in low-rise commercial buildings and in much of the residential and accessibility-lift market served by Easy Living Home Elevators, Residential Lift Company and the other home-lift makers — are driven by a hydraulic power-pack: a motor, pump, valve block and oil reservoir that drives a ram. Power-pack assembly and the fill-and-test operation handle hydraulic oil, and the ventilation demand here is comparatively modest but real.

The hazard is hydraulic-oil mist and aerosol during filling, bleeding and test running, governed by the oil-mist WES of 5 mg/m³, plus the housekeeping and fire-load issues of oil spillage and oil-soaked rag and absorbent accumulation. The control is a local capture hood at the fill-and-test bench ducted to an oil-mist collector, with the bench bunded for spill containment per AS 1940 and the oil store segregated. Hydraulic oil is a combustible rather than flammable liquid, so the hazardous-area classification is lighter than the wet-paint booth, but the AS 1940 storage-and-handling and the spill-containment provisions still apply. The power-pack area is a contained, low-airflow part of the HVAC stack, but it is a meaningful one in the residential-lift plants where hydraulic and screw-drive units are the core product and the power-pack bench is a primary workstation.

12. Assembly and load-test tower — high-bay ventilation and smoke control

The finished car is assembled and then proven against its rated load in a load-test tower — a tall test shaft where the car is run up and down and tested against its rated and overload conditions, the safety gear and overspeed governor are proven, and the ride quality is checked. The test tower is the one part of the factory with minimal fume generation, but it presents a distinct ventilation and smoke-control problem because of its geometry.

A load-test tower is, in HVAC terms, a tall single-volume space — effectively an atrium — that behaves very differently from the low-bay production floor. Thermal stratification is pronounced: heat from the test drive, the lighting and the building fabric rises and pools at the top of the shaft. Ventilation must manage that stratification to keep the working levels comfortable and to prevent a heat build-up that affects test instrumentation, typically through high-level extract and controlled low-level make-up air designed under AS 1668.2. The dominant code-driven concern is smoke management: as a tall enclosed volume the test tower falls under the AS 1668.1 fire-and-smoke-control provisions and the building’s fire-engineering strategy, requiring a smoke-exhaust capability and make-up-air path at the tower to manage a fire within the shaft. Where a hydraulic power-pack or oil-filled component is tested in or near the tower, the oil fire-load is factored into that fire-engineering assessment. The duct demand here is large-section, low-contaminant supply and extract plus smoke-exhaust ductwork — well suited to large galvanised spiral and rectangular construction — rather than the corrosion-resistant, conductive specialty duct of the weld and finishing bays.

13. Hazardous-area classification across the lift factory — AS/NZS 60079 zone map

Pulling the process zones together, a lift, escalator and travelator factory carries a hazardous-area map that the duct designer must read before specifying a single metre of duct. The dust zones under AS/NZS 60079.10.2 are the powder-coat recovery cyclone and hopper interiors (continuous explosible dust, Zone 20), the immediate area around open polishing and linishing and the powder-booth opening (occasional release, Zone 21), and the general powder-handling, grinding and wood-dust areas (unlikely release, Zone 22). The gas and vapour zones under AS/NZS 60079.10.1 are the wet spray-paint booth interior during spraying and the solvent and contact-adhesive store (Zone 1) and the general paint hall and adhesive-bench area (Zone 2).

Each zone drives three things. First, the electrical-equipment selection: every fan, motor, duct-mounted sensor and light fitting in or near a zone must carry the appropriate Ex rating per the AS/NZS 60079 equipment parts. Second, the duct material and bonding: ductwork in a dust or vapour zone must be conductive throughout (galvanised or stainless), continuously bonded with conductive flange gaskets, externally bonded to the building earth grid, and verified below 1 ohm to ground at every section so that static discharge cannot ignite the atmosphere. Third, the deflagration-protection chain on the collector: dust-zone collectors carry NFPA 68 venting and NFPA 69 isolation or suppression, with explosion-isolation valves between the collector and the inbound duct. The zone map is documented on the factory drawings and re-verified at commissioning; the AS 3957 dust hazard analysis sits behind it, quantifying the explosibility, minimum ignition energy and Kst of each dust so the protection chain is engineered rather than guessed.

14. Combustible metal dust — aluminium, stainless and the deflagration chain

Combustible metal dust deserves its own treatment because it is the highest-consequence dust hazard in a lift factory and the one most often under-estimated. Two sources dominate: stainless grinding and polishing dust (fine ferrous-and-nickel-bearing dust with Cr(VI)) and aluminium polishing dust from aluminium cabin trims, doors and decorative elements.

Aluminium fines are the more dangerous of the two. Fine aluminium dust is a reactive combustible metal with a high deflagration index, and it is water-reactive when burning — applying water to an aluminium-dust fire generates hydrogen and worsens it. An aluminium-polishing dust stream must therefore use a wet-bath collector (where the dust is wetted and contained) rather than a dry cartridge collector, and it must never be combined with a ferrous-dust or oily stream. Fine stainless and mixed ferrous dust is less energetic but still a genuine deflagration hazard below a critical particle size, accumulating inside ducts and collectors and requiring either a wet collector or a dry collector with full NFPA 68 deflagration venting and NFPA 69 isolation. The engineered deflagration chain — conductive bonded duct to under 1 ohm, minimum-bend routing to prevent accumulation pockets, an explosion-isolation valve between collector and duct, and a collector sited outdoors or against an external wall where its vent panel can discharge safely — is the standard topology under AS 3957 and AS/NZS 60079. The round spiral 316L geometry from the SBFB-1500, continuously welded on the SB-ZF1500, is the preferred duct because its streamlined cross-section resists the dropout-and-accumulation that turns a combustible-dust duct into a deflagration propagation path.

15. Workplace-exposure-standard dilution calculation — sizing the LEV from the chemistry

The numbers that drive every duct size in a lift factory come out of the workplace exposure standard for each contaminant. The governing principle is that the breathing-zone concentration of each contaminant must stay below its WES at all times, and the LEV is sized to achieve that with margin. Two velocity calculations dominate: capture velocity at the source, and transport velocity in the main.

Capture velocity is the air velocity at the contaminant source needed to draw the contaminant into the hood faster than thermal buoyancy, mechanical disturbance and cross-drafts can carry it past the operator’s breathing zone. For weld fume at the arc, 0.5–1.0 m/s; for stainless polishing and linishing, 0.7–1.0 m/s; across a powder-booth opening, 0.5–0.7 m/s; at a solder tip, about 0.5 m/s; across an oil-mist machining enclosure aperture, 0.5–1.0 m/s. Transport velocity is the minimum velocity in the main needed to keep the contaminant entrained without dropout: 15–20 m/s for weld fume and metallic particulate, 18–22 m/s for grinding and combustible metal dust and wood dust, 10–15 m/s for oil-mist aerosol, and 5–10 m/s for solvent vapour and ozone where there is no particulate to drop out.

The dilution side comes from AS 1668.2: where source capture cannot guarantee the breathing zone stays below the WES, general dilution ventilation supplements it, and the make-up-air rate is set to replace the total extracted volume while holding the production zones at the correct pressure relationship to the office, electronics and test areas. Where several contaminants share a source — Cr(VI), nickel and manganese at a stainless welding station — the additive-mixture rule applies: the sum of the ratios of each contaminant’s concentration to its WES must stay below one, which on stainless work means the system is effectively sized to the Cr(VI) fraction because its limit is so low. This calculation, repeated source by source and then summed at the collector and the make-up-air plant, is the engineering core of the whole system, and it is what separates a designed lift-factory ventilation system from a collection of fans.

16. Material selection — why galvanised is not always the answer

Galvanised steel duct is the workhorse of Australian HVAC, and across the supply-air, general-extract, powder-booth, truss weld-fume and load-test-tower circuits of a lift factory it is the right, cost-effective answer. But several streams demand more, and getting the material right per stream is a defining feature of competent lift-factory duct design.

16.1 Galvanised and aluminised steel — the workhorse streams

Hot-dip galvanised steel to AS 1397 serves supply air, general extract, the powder-coat booth and cyclone extract, mild-steel truss and frame weld-fume mains, wood-dust LEV and the load-test-tower ductwork. It is conductive (suiting hazardous-area bonding), readily formed on the SBAL-V and SBLR-600, and economical. Aluminised steel extends service to the warmer streams — the cooler sections of the cure-oven exhaust downstream of the hot riser, and oil-mist mains where corrosion resistance against condensed oil is wanted at lower cost than stainless.

16.2 316L stainless — the corrosion, carcinogen and cleanability streams

316L stainless (Cr 16–18%, Ni 10–14%, Mo 2–3%, C ≤0.03%) is the right material wherever the stream is corrosive, carries a carcinogen that must be cleaned out periodically, or must be hermetic and conductive. That covers stainless weld-fume and Cr(VI) extraction, pickling and passivation acid fume, the wet-paint and isocyanate extract, and the fine combustible-metal grinding-dust mains. 316L withstands acid fume carry-over, is cleanable for periodic Cr(VI) deposit removal, and gives reliable earth-bonding below 1 ohm with the right flange gasket. The SBAL-V with the stainless option produces 316L rectangular duct; the SBFB-1500 produces 316L round spiral; the SBSF-1525 and SB-ZF1500 lay the continuous TIG seam that makes the duct hermetic and conductive.

16.3 309/310S high-temperature stainless — the hot oven sections

For the cure-oven exhaust hot section and any stress-relief or heat-treat oven exhaust above the safe service temperature of 316L, 309/310S high-temperature stainless (Cr 22–25%, Ni 12–20%) extends service well above 600 °C with good oxidation resistance. The SBPC1500 plasma cutter handles 309/310S up to 25 mm thickness for the transitions and relief-panel frames; the first hot section of the oven riser is built in 309/310S with bellows expansion joints sized for the thermal growth, transitioning to aluminised or galvanised on the cool side.

17. The SBKJ machine line — duct-fabrication roles for a lift and escalator factory

Fabricating lift-factory ductwork in an Australian shop requires the right machine fit, the right process discipline and the right documentation. The SBKJ Product Catalog 2026 covers the full envelope, with each machine playing a defined duct-fabrication role:

SBAL-V — auto duct line with stainless option, handling galvanised and 304/316L stainless from 0.7 mm to 1.6 mm with TDF flange forming. Production rate in the 4–10 m/min range depending on gauge and material. The workhorse for the bulk of supply, general extract and weld-fume rectangular ductwork, and for the 316L stainless Cr(VI) and acid-fume extraction envelope in the cabin shop.

SBAL-III — heavy-gauge auto duct line for 1.6–2.0 mm work. Used for the large escalator-truss canopy ductwork, the baghouse-inlet mains, and the heavy cure-oven cool-side exhaust.

SBSF-1525 — longitudinal stitch welder laying a continuous TIG seam on the lock-seam joint at 600–900 mm/min on 1.2 mm 316L with argon shield at 12 L/min. Used for the hermetic, conductive stainless weld-fume, Cr(VI) and acid-fume mains where a sealed, cleanable envelope is required.

SB-ZF1500 — longitudinal stitch welder for trunk-main continuous TIG seam, running in-line with the SBFB-1500 spiral former. Used for the combustible-metal grinding-dust mains and corrosive-fume mains above 1000 mm diameter.

SBFB-1500 — spiral tubeformer producing round duct 80–1500 mm diameter in 0.6–1.5 mm galvanised, aluminised or stainless. The single most-used machine for lift-factory dust and fume mains — grinding and polishing dust, powder-coat extract, weld-fume trunks, wood-dust LEV and oil-mist mains.

SBPC1500 — plasma cutter handling stainless and high-temperature alloys up to 25 mm thickness with HD plasma quality. Used for custom transitions, cure-oven and high-temperature riser geometry, refractory-anchor stud plates, explosion-relief panel frames, and the irregular hood plates over polishing, grinding and machining cells.

SBLR-600 — lock former producing Pittsburgh-lock and snap-lock longitudinal seams for rectangular duct, with heavy-gauge tooling for 1.2 mm 316L cabin-shop and acid-fume service.

SBTF-1500/1602/2020 — spiral and TDF flange former family for trunk mains 1500–2000 mm diameter. Used for the central baghouse collection mains serving multiple weld and grind cells, and for large supply and load-test-tower ductwork.

The combined machine fit gives an Australian fabricator the production envelope to cover every duct requirement in a lift, escalator and travelator plant — from the corrosion-resistant 316L Cr(VI) weld-fume LEV and combustible-dust grinding mains, through the powder-coat and cure-oven exhaust, to the large galvanised supply and test-tower ductwork — all fabricated locally from Box Hill North VIC.

18. Commissioning, monitoring and measurement & verification

Commissioning lift-factory ductwork is more demanding than commissioning conventional commercial HVAC because the system has to demonstrably protect workers from a confirmed carcinogen and a deflagration hazard. The compliance documentation required at handover includes pressure-test records to 1.5 times design pressure for 30 minutes per AS 4254, earth-bonding verification below 1 ohm to ground at every flange in the hazardous-area circuits, conductivity verification on every flexible connection, a NATA-certified airflow balance against the design schedule, the AS 3957 dust hazard analysis tied to the AS/NZS 60079 zone map, and the welding (AS/NZS 1554.1/.6), flammable-liquid (AS 1940) and oven (AS 1375) documentation for the relevant circuits.

Ongoing monitoring and measurement-and-verification (M&V) run on daily, weekly, monthly, quarterly and annual cycles. Daily: visual confirmation of LEV operation at each weld, grind, polish and paint station, and pressure-differential checks across the dust collectors. Weekly: inspection of duct interiors at access ports for dust accumulation, condition of bonding straps and condition of conductive flange gaskets. Monthly: airflow-balance verification at key branches, isolation-valve actuation test and fan-vibration measurement. Quarterly: NATA-certified breathing-zone air sampling against the WES for every operator-occupied zone — with the Cr(VI) result on stainless welding and polishing as the headline figure — fed into the ISO 45001 work-health-and-safety system. Annual: full-system pressure test, full bonding-resistance re-verification, deflagration-protection inspection on the dust collectors per AS 3957, oven burner-management and LEL-system verification per AS 1375, and Ex-equipment inspection per AS/NZS 60079.17. Every length of ductwork SBKJ supplies is delivered with its mill certificate, fabrication date, pressure-test record and earth-bonding verification, so the manufacturer can fold the duct paperwork directly into the ISO 9001 and ISO 45001 evidence base.

19. Standards table — the lift-factory HVAC compliance map

A consolidated map of the standards and codes that govern HVAC ductwork in an Australian lift, escalator and travelator factory, suitable for inclusion in a design basis or handover pack:

• AS 1668.1 — fire and smoke control via ventilation; load-test-tower smoke management and fire/smoke dampers.
• AS 1668.2 — mechanical ventilation, contaminant dilution, make-up air and the WES framework across every zone.
• AS/NZS 4254.1 and .2 — rigid sheet-metal and flexible duct construction; pressure-test to 1.5× design for 30 minutes.
• AS 1530.4 — fire resistance of building elements; fire-rated duct penetrations at compartment boundaries.
• AS/NZS 1554.1 — welding of steel structures; truss, frame and bracket fabrication fume basis.
• AS/NZS 1554.6 — welding of stainless steel; stainless car-shell and cladding Cr(VI) fume basis.
• AS 1940 — flammable and combustible liquids; wet-paint booth, solvent and adhesive store, hydraulic-oil store.
• AS 3957 — dust hazard areas; powder-coat, grinding/polishing and wood-dust deflagration analysis and zoning.
• AS/NZS 60079 — explosive atmospheres; Zone 20/21/22 dust and Zone 1/2 vapour classification and Ex-equipment selection.
• AS 1375 — industrial fuel-fired appliances; powder-coat cure oven and heat-treat oven exhaust, purge and LEL monitoring.
• AS 4024 — machinery safety; guarding and safe access for served machines and for duct maintenance.
• AS/NZS 1715 and 1716 — respiratory protective equipment selection and standards; PAPR and air-fed respirator selection.
• AS 1735 — lifts, escalators and moving walks construction; the product context the factory serves.
• AS 1428.1 — design for access and mobility; accessible-lift mandate via NCC and the DDA access provisions.
• NCC Section J — building energy efficiency; fan power, duct insulation, heat recovery and economy cycle.
• ASHRAE 62.1 — ventilation for acceptable indoor air quality in office, electronics and test areas.
• ISO 9001 / ISO 14001 / ISO 45001 — quality, environmental and OHS management systems and the duct-traceability evidence base.
• NFPA 68 / NFPA 69 — deflagration venting and explosion prevention; cross-referenced on combustible-dust collectors.

This compliance map is the bridge between the fabricated ductwork and the manufacturer’s ongoing regulatory obligation. Every length of duct SBKJ supplies to an Australian lift-factory fabricator is delivered with the foundation paperwork — mill certificate, fabrication date, pressure-test record and earth-bonding verification — that the manufacturer integrates into its ISO, SafeWork and EPA-licence documentation.

20. Energy, heat recovery and Green Star / NABERS in the lift factory

A lift factory extracts a large volume of air — weld-fume LEV, powder-booth and cure-oven exhaust, grinding-dust mains and general dilution — and every cubic metre extracted is a cubic metre of conditioned make-up air that has to be brought in and tempered. That makes energy and heat recovery a first-order design concern, both for operating cost and for the building’s sustainability rating. NCC Section J sets the regulatory floor on fan power, duct insulation and heat recovery; beyond the floor, two recovery opportunities stand out. First, the cure-oven exhaust at 180–200 °C is a concentrated heat source that can pre-temper incoming make-up air through an air-to-air heat exchanger, recovering a substantial fraction of the oven’s energy. Second, the large general make-up-air load can use heat-recovery ventilation to recover heat from the bulk extract in winter and reduce cooling load in summer, sized against the Melbourne, Sydney, Brisbane or Perth climate of the plant.

Sustainability ratings increasingly bear on industrial buildings. Green Star (the Green Building Council of Australia rating) and NABERS (the National Australian Built Environment Rating System) reward efficient ventilation, heat recovery and low-energy plant; a manufacturer pursuing a rated facility, or a tenant in a rated industrial estate, will specify the HVAC accordingly. Efficient duct design feeds directly into the rating: low-leakage construction (which the continuously welded SBSF-1525 and SB-ZF1500 seams support), correctly sized ductwork that avoids excess fan power, and recovered exhaust heat all contribute. The duct fabricator’s role is to deliver leak-tight, correctly sized, well-insulated ductwork so that the designed energy performance is actually achieved on site rather than lost to leakage and oversizing.

21. Accessibility, high-rise construction and the demand outlook

The demand for Australian-built and Australian-finished lifts, escalators and travelators rests on three durable structural trends, each of which keeps the local fabrication and fit-out floors — and therefore the HVAC infrastructure that serves them — busy. First, high-rise and medium-density construction in the eastern-seaboard capitals: every residential and commercial tower needs lifts, and the taller and more numerous the towers, the more cars, doors, cabins and architectural fit-out are fabricated and finished locally. Second, mandated accessibility: the National Construction Code and the Disability Discrimination Act access provisions, referenced through AS 1428.1, require accessible lifts in a wide range of new and upgraded buildings, sustaining demand for accessible passenger lifts and platform lifts. Third, an ageing population: the shift toward ageing in place is driving strong growth in residential and home-lift adoption, the core market of Easy Living Home Elevators, Residential Lift Company, Compass/Surelift and the other home-lift specialists.

Underneath the new-build demand sits a deep modernisation and maintenance market. Australia’s installed base of lifts and escalators is large and ageing, and modernisation — replacing drives, controllers, cabins and fixtures while retaining the shaft — is a steady, counter-cyclical workload that keeps cabin fabrication, fit-out, electronics and machining busy regardless of the new-construction cycle. Every one of these trends feeds back to ductwork demand: new factories, expanded factories, relocated factories and the replacement of ageing first-generation extraction infrastructure all require AS/NZS 60079-zoned, AS 3957-compliant, correctly material-matched ductwork fabricated to AS 4254 with continuous earth bonding and hermetic seam where required. SBKJ’s 2026 catalogue and engineering support are positioned to serve this market across Australia — from the Sydney and Smithfield cabin-fabrication belt, through the Dandenong and Mulgrave industrial corridor in Melbourne, to the Gold Coast, Brisbane and Perth fit-out and home-lift clusters.

22. Industry bodies and standards organisations

The Australian vertical-transport sector is supported by an active set of industry bodies and standards organisations that shape the codes and practice the HVAC must follow. The National Association for the Engineering Trades and the broader lift-industry associations represent installers, manufacturers and maintainers; the Lift Engineering Society of Australia provides the technical-engineering community for lift and escalator engineers. Internationally, the Chartered Institution of Building Services Engineers (CIBSE) publishes vertical-transport engineering guidance that Australian practitioners reference alongside the local standards, and the NAEC (the North American elevator-industry body) is a common cross-reference for global manufacturers operating Australian arms. On the building-services and HVAC side, AIRAH (the Australian Institute of Refrigeration, Air Conditioning and Heating) is the peak professional body for the mechanical engineers who design the factory ventilation, and AMCA Australia covers the air-movement-and-control equipment used in it.

The standards backbone is published and maintained by Standards Australia (the AS and AS/NZS publisher, including AS 1735, AS 1668, AS 4254, AS/NZS 1554, AS 1940, AS 3957, AS/NZS 60079, AS 1375 and AS 1428.1), with the National Construction Code administered by the Australian Building Codes Board. SafeWork Australia sets the workplace exposure standards and the model work-health-and-safety framework that the state regulators enforce. NATA (the National Association of Testing Authorities) accredits the laboratories that perform the breathing-zone air monitoring and commissioning verification, and the state environment protection authorities license the stack emissions from the dust collectors, paint booths and cure ovens. Together these bodies define the regulatory and technical environment in which a lift-factory HVAC system is designed, fabricated, commissioned and operated.

23. Competitive positioning — why local fabrication wins on lift-factory ductwork

The case for fabricating lift-factory ductwork locally, on the right machinery, rests on the specificity of the work. A vertical-transport plant is not a warehouse or an office — it is a multi-process metalworking and finishing facility where the ductwork has to handle a confirmed carcinogen (Cr(VI)), a deflagration hazard (combustible metal and powder dust), a respiratory sensitiser (isocyanate and rosin), a high-temperature oven exhaust, and a set of corrosive fume streams, often in the same building. A generic commercial duct supplier treating the job as galvanised-by-the-metre under-specifies the stainless Cr(VI) circuit, mishandles the combustible-dust bonding and isolation, and leaves the manufacturer carrying the compliance risk.

Fabricating locally on a complete SBKJ machine line — SBAL-V and SBAL-III auto duct lines, SBSF-1525 and SB-ZF1500 stitch welders, SBFB-1500 and SBTF spiral formers, SBPC1500 plasma cutter and SBLR-600 lock former — gives an Australian fabricator three advantages over both generic local suppliers and distant fabrication. First, the right material on the right circuit: 316L stainless with continuous TIG seam where Cr(VI), acid fume and combustible dust demand it; galvanised and aluminised where they suit; high-temperature stainless on the oven riser. Second, speed and proximity: a Box Hill North VIC base means short lead times and on-site commissioning support to the Melbourne plants and a controllable supply chain to the Sydney, Brisbane, Gold Coast and Perth clusters, with no import lead time or freight risk on the specialty stainless work. Third, documentation that survives audit: mill certificates, pressure-test records, earth-bonding verification and AS-compliant labelling on every section, ready to fold into the manufacturer’s ISO 9001, ISO 45001, SafeWork and EPA evidence base. That combination — correct engineering, local responsiveness and audit-ready documentation — is what wins lift-factory ductwork, and it is exactly what the SBKJ machine line is built to deliver.

24. Closing — SBKJ engineering support for Australian lift and escalator manufacturing

The Australian vertical-transport manufacturing sector is moving steadily on the back of high-rise construction, mandated accessibility, an ageing population and a deep modernisation backlog — and every cabin, car, door, frame, truss and balustrade fabricated and finished locally exposes the limits of generic commercial HVAC and demands purpose-engineered ductwork that meets the full standards stack outlined in this guide. The SBKJ Group engineering team in Box Hill North VIC is positioned to support Australian fabricators and their mechanical contractors with a combination of machine supply (SBAL-V, SBAL-III, SBSF-1525, SB-ZF1500, SBFB-1500, SBPC1500, SBLR-600 and SBTF-1500/1602/2020), engineering documentation, commissioning support and ongoing technical advisory across every process zone described here — cabin weld-fume and Cr(VI) LEV, powder-coat and cure-oven ventilation, combustible-dust collection, oil-mist machining extraction, solder-fume capture and load-test-tower ventilation.

We will be exhibiting at ARBS 2026 in Sydney in May with the full SBKJ machine portfolio plus vertical-transport reference samples covering the 316L stainless Cr(VI) weld-fume envelope, the combustible-metal grinding-dust spiral, the powder-coat and cure-oven exhaust transitions, and the corrosion-resistant acid-fume duct. Pre-show meetings with Australian lift, escalator and travelator fabricators, fit-out specialists and their mechanical contractors are scheduled across the week.