Battic Door 4 Inch Diameter Back Draft Damper

The Cape Backdraft Damper is designed to overcome the inefficiencies and limitations of traditional gravity or butterfly dampers. It incorporates a special fabric sleeve attached to the interior of a metal sleeve. The fabric sleeve will allow air to pass through in the desired direction of flow with minimal reduction in airflow. Key Product Features: Silent Economical Energy Efficient Easy Installation Innovative Design No Mechanical Parts Assembled in the USA Rated to 160ºF/71ºC The Cape Backdraft Damper works better than other dampers at stopping undesired airflow. It is far superior in that it allows unrestricted airflow in the desired direction without reducing system efficiency. The Cape Backdraft Damper is silent, produces no metal clanging sounds, tested to UL723 standards and can be installed in horizontal or vertical ductwork. The Cape Backdraft damper is designed to install within 4" rigid ductwork and is an excellent choice for dryer venting, bathroom exhaust ventilation, or any ventilation application where maximum airflow out and minimal backdraft in is desired! Damper dimensions - 5-1/4" L X 4" Dia.