Quick view Atco 20" UPC #036 Insulated UL181 Class 1 Flexible Duct (25' per Box) Our premium insulated duct has a double ply, metallized polyester vapor barrier with tri-directional reinforcements. #036 - Double ply polyester core, R-Value = 6.0
Quick view Atco 20" UPC #050 Un-Insulated UL181 Class 1 Air Connector Flexible Duct (25' per Box) Uninsulated used for supply, return, exhaust, and any other application where an uninsulated flexible air connector is needed.