Triple Lock insulated aluminum flex duct with a polyethylene vapour barrier - Class 1 air duct/connector. T/L-T is manufactured by using a dead soft aluminum strip, spirally wound and mechanically joined together with an inner duct that is covered with a thick fiberglass insulation and a flame retardant, non-toxic polyethylene vapour barrier. This top rated ULC-S110 and UL-181 Class 1 product is an excellent insulated air duct for most energy efficient heating and cooling systems.
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