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.