Mechanical Supplies
Perforated Galvanized Iron
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- Perforated galvanised sheet in round, square and slotted hole patterns, specified by hole size, pitch and the resulting open area. Open area drives both the acoustic performance and the airflow resistance, so it is the number that has to be stated.
Application
Forms the facing over acoustic infill in duct silencers, AHU casings, acoustic enclosures and lined plenums, holding the media in place while letting sound reach it. Also used for equipment guards, ventilation screens and architectural panels where air must pass and the fill must not escape.
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.
ASTM E84
Surface burning characteristics: the flame spread index and smoke developed index a material is classified by. Class A is the usual requirement in an occupied building.
UL 181
Factory-made air ducts and air connectors: the listing a flexible or fabricated duct carries.
Also citedISO 7806
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