Quietflex® 420C Uv-Inhibited Flex Duct, 4 in x 25 ft

Quietflex® Flexible Duct, UV-Inhibited Insulated, Series: 20 Series, 4 in Inside Dia, 25 ft Length, 6000 fpm, R4.2 Insulation Value, 0.11 perm Vapor Transmission, -1/2 to 10 in-WC, -20 to 180 deg F, Polyester/Fiberglass/Polyethylene, Black, Domestic