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

One Way Air Flow Valve 7" Duct SKU: Tti-CBD7 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 Cape Backdraft Damper 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 and can be installed in horizontal or vertical ductwork. Volume discounts available, call 1-800-222-5932 for a quote. Allow one week to ship. UPS ground shipping within Continental U.S. only, all others please call for quote. Click here for additional product information.       Installation video        Technical Data Sheet Price:  $15.00 ea. Shipping:  $15.00 Quantity