Collared Duct for a smooth transition to your sheet metal fittings

Our 6′ and 7′ collared Silver Jacket Flex Duct has a metallic, polyester-vapor barrier with special rip-stop scrim reinforcement. It is constructed with universal male / female collars that are factory attached at each end. Standard diameters are available in 4″ to 20″ for R-value 4.2, 6 and 8. These are packaged 2 pieces per box.