Why data centre HVAC duct is a different market
Hyperscale data centres are the single largest commercial HVAC project category in 2026. A 50 MW hyperscale facility consumes 8,000–15,000 m² of HVAC ductwork over a 12–18 month construction window, with strict requirements on dimensional tolerance, fire rating and acoustic performance. The fabricators serving this market need a different equipment fleet, a different standards capability, and a different production rhythm than fabricators serving commercial office buildings or shopping centres.
Once a fabricator wins a data centre framework agreement, the volume and the technical specification both step-change. This guide is the equipment and process framework we walk through with fabricators positioning for data centre work.
Airflow demand drives everything
Data centre cooling is sized by IT load. A typical 1 MW IT load requires approximately 75,000–110,000 CFM (35–50 m³/s) of cooling air at the ASHRAE TC 9.9 recommended supply temperature of 18–27 °C. Air handling units (CRAC/CRAH or air-side economiser) deliver this air through supply ductwork to the cold aisle, the hot return air is captured (often via hot aisle containment) and ducted back to the AHU.
For a 50 MW facility, that is 3.75–5.5 million CFM (1,750–2,600 m³/s) circulating continuously. The supply duct main risers are typically very large rectangular sections (1,500 × 750 mm or larger) running at +1 to +2 in.wg. Branch ducts step down to 600 × 400 mm and below. Round duct (spiral) is common for shorter runs and economiser intakes.
Standards that apply
- SMACNA HVAC Duct Construction Standards (rectangular and round) — dominant specification for data centre HVAC duct in North America, Middle East and international hyperscale projects. See our international standards comparison.
- EN 1505 / EN 1506 — Europe
- AS/NZS 4254.1 and 4254.2 — Australia and New Zealand (mandatory by NCC)
- ASHRAE 90.1 energy standard
- ASHRAE 62.1 ventilation standard
- ASHRAE TC 9.9 Thermal Guidelines — driving supply air temperature and humidity envelope
- UL 1978 / EN 1366-1 / BS 476 — fire-rated duct construction for risers and floor penetrations
- NFPA 75 / NFPA 76 — Standard for the Fire Protection of Information Technology Equipment (NFPA 75) and Fire Protection of Telecommunications Facilities (NFPA 76)
- Project-specific specifications — hyperscale operators (AWS, Azure, Google, Meta, Equinix, Digital Realty) often have additional brand-specific HVAC duct specifications layered on top of public standards
Gauge tables for data centre duct
Data centre supply air typically operates at +1 to +2 in.wg (250–500 Pa). Per SMACNA tables, this drives the following gauge:
- Up to 300 mm wide: 24-gauge (0.7 mm) galvanised
- 300–600 mm wide: 22-gauge (0.85 mm)
- 600–1,200 mm wide: 20-gauge (1.0 mm)
- 1,200–1,500 mm wide: 18-gauge (1.2 mm)
- Above 1,500 mm wide: 16-gauge (1.5 mm) with reinforced cross-bracing
Hot aisle return duct often operates at slight negative pressure (-1 to -3 in.wg in containment systems) and follows the negative-pressure SMACNA tables, typically requiring one gauge heavier than the supply for equivalent dimension. Reinforcement spacing tightens for negative pressure applications.
Fire-rated duct in data centres
Data centre HVAC duct frequently passes through fire-rated walls (compartmentation walls, generator room separations) and floor penetrations. These passages require fire-rated duct construction per:
- UL 1978 in North America (1-hour or 2-hour fire rating)
- EN 1366-1 in Europe (E, EI 30, EI 60, EI 90, EI 120 ratings)
- BS 476 Part 24 in the UK
- AS 1530.4 in Australia
Typical fire-rated construction: standard galvanised duct wrapped with fire-rated insulation board (Promat 25 or 50 mm board, Cafco K150 spray, or 3M Interam wrap) at fire-rated penetrations. The duct manufacturing shop produces the steel duct using standard SBAL-V or spiral tubeformer; the fire wrap is applied on site by the HVAC fitter. Taokron supplies the duct forming equipment; we do not supply the fire wrap material.
Acoustic performance
Data centre supply duct often runs adjacent to office spaces, NOC rooms or building occupied areas. Acoustic transmission through duct walls is typically managed by internal duct lining (1" or 2" foam-faced fibreglass internal duct liner). For very high acoustic requirements, double-skin acoustic duct with mineral fibre infill is specified.
EMI shielding (specialist applications)
For some federal, defence and high-security data centre rooms, HVAC duct is specified with EMI (electromagnetic interference) shielding to prevent emissions from the IT load propagating along the duct path. Typical solution: copper mesh or copper foil wrap on the duct exterior, bonded to the building EMI grounding system. Taokron supplies the standard galvanised duct; the EMI shield is applied by a specialist contractor.
Equipment list for a data centre HVAC duct fabricator
A fabrication shop targeting the data centre construction market needs the following minimum equipment fleet to deliver hyperscale volumes:
- SBAL-V auto duct production line (rectangular supply and return) — running at 18 m/min line speed single-shift, multi-shift capable
- SBTF-1602 spiral tubeformer (round duct for branches and economiser intakes) — Φ80–1,600 mm, flying shear
- SBTF-2020 spiral tubeformer (large-diameter risers) — Φ80–2,500 mm, for trunk and main risers
- TDF flange forming machine — connects rectangular sections, primary joint type
- SBLC lockformer — Pittsburgh seam forming for rectangular duct
- CNC plasma cutter (1550 × 5000 mm bed) — high-throughput blank cutting
- Hydraulic shear and folding — for fittings, transitions and reducers
- Welding station — for any continuous-weld sections (acoustic chambers, special fittings)
- Auxiliary — auto corner mounting, hoop machine, run-out tables
Taokron quotes this fleet to specification — pricing is withheld, so request an itemised quotation covering the machinery plus freight, customs and rigging. Monthly output depends on duct size mix, gauge and shift pattern, so size the fleet against your own project schedule.
Throughput planning for hyperscale projects
A 50 MW hyperscale build typically demands HVAC duct delivery of 8,000–15,000 m² distributed over 12–18 months. The fabricator's planning challenge is matching site demand pull against fabrication production push. Common patterns:
- Front-loaded delivery for early-stage shell-and-core (large risers, main horizontals, plant room duct)
- Mid-cycle peak for fitout phase (branch ducts, terminal connections, fire-rated wraps)
- Back-loaded fittings for commissioning (custom adapters, terminal fittings, balancing dampers)
Multi-shift operation on the SBAL-V is the usual answer to peak-cycle demand, and fabricators with two lines can serve more than one hyperscale project at a time. Confirm achievable output against your own duct mix.
Quality acceptance criteria
Hyperscale projects audit duct quality against very tight tolerances. Typical acceptance criteria:
- Length tolerance: ±2 mm on sections up to 2 m, ±5 mm above 2 m
- Squareness: corner-to-corner diagonal within ±3 mm
- Leak rate: SMACNA Class A (or EN Class C / AS-NZS Class C equivalent) at +2 in.wg test
- Reinforcement spacing: per SMACNA tables for the specified pressure class
- Surface finish: no visible scratches longer than 50 mm, no dents deeper than 0.5 mm
- Galvanising integrity: no zinc disturbance from forming or handling visible to the eye
Confirm with Taokron what tolerances a given machine will hold for your duct mix. In practice the limiting factor in field acceptance is usually handling damage between fabrication shop and installation, not the fabrication itself.
Why Taokron for data centre HVAC duct fabricators
- Australia office for English-speaking after-sales coordination on Australian and SE Asian projects
Get a data-centre-ready Taokron quotation →
FAQ
What duct standard applies to data centre HVAC?
SMACNA dominates in North America/ME/international, EN 1505 in Europe, AS/NZS 4254 in Australia/NZ. ASHRAE TC 9.9 governs cooling design; UL 1978 / EN 1366-1 / BS 476 govern fire-rated construction.
What gauge sheet metal is used for data centre duct?
Data centre supply air typically operates at +1 to +2 in.wg (250-500 Pa). Per SMACNA tables, this calls for 22-gauge on ducts 300-600 mm wide, 20-gauge for 600-1,200 mm and 18-gauge up to 1,500 mm. Hot aisle return duct often operates at negative pressure and needs the same gauge with tighter reinforcement spacing. Galvanised steel is standard; stainless is specified only for very specific high-density rooms or where condensation risk is elevated.
How is fire-rated duct different in data centres?
Data centre HVAC duct passing through fire-rated walls or floors requires fire-rated construction per UL 1978 (in North America) or EN 1366-1 / BS 476 (Europe and UK). Typical construction is single-skin galvanised duct wrapped in fire-rated insulation board (Promat, Cafco) or constructed from fire-rated composite material. Taokron supplies the duct forming machine; the fire wrap is typically applied on site by the contractor.
What is the typical data centre HVAC duct supply contract size?
For a typical 50 MW hyperscale data centre, HVAC ductwork supply represents approximately AUD 8-15 million across the project. A typical mid-tier 5-15 MW colocation site is AUD 1.5-4 million. The duct fabrication shop providing the supply needs to deliver 8,000-15,000 m² of finished duct across a 12-18 month hyperscale project, with peak months well above the average — meaning the fabricator needs at least one SBAL-V auto duct line and a spiral tubeformer running multi-shift.
Does Taokron have data centre project references?
Taokron does not publish a data centre reference list. The real Australian installations we can show are the Airtemp Canberra and Kavanagh Industries Sydney case studies. For data centre work, a common machine set is the SBAL-V for rectangular supply duct, the SBTF-1602 for round duct and TDF flange for connections; ask an engineer to match it to your duct mix.
