Indoor air quality, whole house fans, exhaust and ventilation fans

One Way Air Flow Valve 8" Duct SKU: Tti-CBD8 The Cape Backdraft Damper is an in-line one way air flow valve. It opens and closes with minimal pressure in either direction. It does not rust nor require any maintenance. Fits inside the duct-see here. the ultimate one way air flow valve, designed to overcome the inefficiencies and limitations of traditional gravity or butterfly dampers. The Cape Backdraft Damper consists of a specially formulated fabric sleeve attached to an outer metal sleeve. The fabric sleeve will allow air to pass through in the desired direction of flow with miniscule reduction in airflow. 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, is tested to UL723 standards and can be installed in horizontal or vertical ductwork. Volume discounts available, call 1-800-222-5932 for a quote. UPS ground shipping within Continental U.S. only, all others please call for quote. Allow one week to ship. Click here for additional product information.    Installation video     Technical Data Sheet Price:  $17.00 ea. Shipping:  $15.00 Quantity