The Tamarack Cape Backdraft Damper is a non-mechanical in-line one way air flow valve that requires minimal pressure to operate, has no moving parts and tested to UL 723 standards. Get the full force of your fan with this non-restrictive damper which fits snugly inside the duct. 5 sizes available.

" During the windy winter months, the damper keeps performing with NO CLANGING!" - Sara P. Wasilla, AK.

 UPS ground shipping within the Continental U.S. all others call for quote. No Sales Tax

Click on the image below to view installation video