Our premium insulated duct has a double ply, metallized polyester vapor barrier with tri-directional reinforcements.
Atco Flexible Air Duct, Series: 30 Series, Round Vent Duct, 25 ft Length, 18 in Diameter, 10 in-WG, Fiberglass/Metallized Polyester, Sliver, R-Value: R8, 5000 fpm Velocity Rating, Plain End Connection, -20 to 140 deg F, 0.05 perm Vapor Transmission