The 4 in. x 8 ft. Heavy-duty Semi-Rigid Aluminum Duct is UL2158A listed and marked for safe dryer venting. It is ideal when UL all aluminum duct is required by code in some gas and electric dryer applications. This duct is totally noncombustible and has a maximum operating temperature of 435 degree F.
New manufacturing technology incorporated into the duct allows for easy rotation and therefore more durable handling of the duct by the contractor
Semi-rigid product holds its shape to help improve airflow
UL duct is thicker than the standard non-UL semi-rigid version