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- Hot-dip galvanised steel sheet and coil in Z140 to Z275 zinc coating classes and gauges suited to duct construction. Coating weight, not thickness, is what determines how long the duct resists corrosion.
Application
The base material for rectangular and spiral ductwork, plenums, damper frames, casings and supports. Gauge is selected from the duct's pressure class and largest dimension per SMACNA tables
using a lighter gauge to save material is what produces the drumming and duct leakage that shows up later at commissioning.
Standards & Reference 5 cited
ASTM A653
Hot-dip zinc-coated (galvanized) steel sheet, with the coating designations that set corrosion life.
EN 10346
The European standard for continuously hot-dip coated steel flat products, the counterpart to ASTM A653.
SMACNA HVAC Duct Construction Standards
The North American reference for how ductwork is built: gauge, reinforcement and sealing against pressure class. What a duct submittal is checked against.
Also citedEN 10143ASTM A924
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