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Cleanroom Air Distribution Systems
Galvanized Steel Rectangular Air Duct
A rigid G90 galvanized sheet-steel duct fabricated in rectangular sections for space-efficient cleanroom supply, return and general ventilation routes.
- G90 Zinc-Coated Steel
- Space-Efficient Rectangular Form
- Reinforced Flat Panels
- Sealed Flange Connections
Product Introduction
Galvanized steel rectangular ductwork provides a durable and economical air path where ceiling zones, risers or equipment connections favor a rectangular section. Straight sections are formed from zinc-coated sheet steel with Pittsburgh-lock or welded longitudinal seams, transverse reinforcement and flanged ends selected for the duct dimensions and pressure duty. Smooth internal surfaces reduce friction and provide accessible wipe-down areas, while mastic or closed-cell gaskets seal the transverse joints. The format integrates readily with dampers, filters, terminal housings and rectangular equipment plenums.
Key Features
Rectangular proportions use shallow ceiling voids more efficiently than equivalent circular ductwork.
Standing seams, beading or external reinforcement limit panel vibration on larger duct faces.
Flanged transverse joints allow long routes to be assembled from replaceable factory-made sections.
Customer Product Concerns
Rectangular ductwork must remain rigid, clean and sufficiently airtight even when broad panels and numerous field joints are installed above a congested cleanroom ceiling.
Wide duct faces drum or flex when fan pressure changes.Sheet gauge, cross-breaking and reinforcement spacing are selected for the largest panel dimension and pressure class.
Air leakage at repeated transverse joints wastes conditioned cleanroom airflow.Matched flange corners, continuous gasket and exterior sealant create a consistent joint compression path.
A round duct cannot fit the available shallow ceiling zone.A low-profile rectangular aspect ratio preserves flow area while reducing installed depth.
Exposed cut edges corrode after site modification.Cut edges are deburred, cleaned and protected with a compatible zinc-rich repair coating.
Typical Applications
Cleanroom supply-air mainsReturn-air and recirculation ductsAir-handling-unit connectionsCeiling service corridorsGeneral laboratory ventilation
Technical Parameters
Common fabrication ranges for indoor G90 galvanized rectangular air duct are listed below.
| Core Material | G90 hot-dip galvanized carbon-steel sheet |
|---|---|
| Panel Thickness | 0.55–1.50 mm, selected by duct size and pressure duty |
| Effective Width | 150–2000 mm rectangular side dimension |
| Maximum Length | 1500 mm per standard fabricated section |
| Steel Facing Thickness | 0.55–1.50 mm galvanized sheet body |
| Core Density | Approximately 7850 kg/m³ solid steel construction |
| Thermal Conductivity | Approximately 50–55 W/(m·K) for low-carbon galvanized sheet |
| Surface Finish | Continuous G90 zinc coating with optional external powder coating |
| Joint Type | TDC/TDF or angle flange with closed-cell gasket and sealed corners |
| Customization | Available based on the intended application and operating environment. |
Available Options
Internal or external thermal insulationPowder-coated external finishAccess doors and test portsTransitions, offsets and equipment plenums
Planning a Galvanized Steel Rectangular Air Duct specification?
Send us your dimensions, installation conditions, performance targets and required surface finish.
