A semi rigid and lightweight non-insulated air duct, Triple Lock (T/L) is manufactured by using a dead soft aluminum strip which is spirally wound and mechanically joined together forming an air tight and leak-proof triple lock seam. A self supporting and corrosive resistant ULC-S110 and UL181 Class 1 product is produced which provides excellent strength and flexibility, adaptable to any low to high pressure heating, ventilation and air conditioning system.
Note: To be used in fresh air intake only. Not to be used as a chimney liner.
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