Everbilt 4 in. x 25 ft. Flexible Aluminum Foil Duct

This 4 in. x 25 ft. flexible aluminum foil duct is ideal for bathroom fan exhausting and other general purpose exhaust applications. Three layers of aluminum foil laminate are included in its composition that will withstand temperatures up to 250°. This product has been rated as an air duct connector under UL 181 and should never be used for dryer venting purposes.Made from 3-ply aluminum foil laminateMaximum operating temperature of this product is 250°Product should never be used for dryer venting applicationsRated as a UL 181 class 1 flexible air duct connector