The FAMCO BD Butterfly Backdraft Damper is used as a back draft damper for heat exchangers, exhaust systems, solar heating systems and other intake or exhaust applications where a powered damper is not needed. This damper works in both horizontal or vertical positions and the foam seal provides minimal air leakage. Due to its unique design and Aluminum blades, it opens easily with normal air flow and closes with gravity. Quality constructed Galvanized steel, gauges 28 to 22.
The FAMCO BD Butterfly Backdraft Damper comes in sizes 4 inch, 5 inch, 6 inch, 7 inch, 8 inch, 10 inch, 12 inch, 14 inch, 16 inch, 18 inch and 20 inch. Spec sheet available for download.
The FAMCO BD Butterfly Backdraft Damper is manufactured by Famco in the United States and comes with a 1-year warranty against product defects and workmanship. If you have any questions about this damper, please refer to the FAQs above or feel free to contact us by phone or email.
We use these when sealing a crawlspace or attic. As an insulation contractor, we use spray foam to encapsulate & insulate these areas for homeowners. The 4" damper is inserted into an HVAC supply plenum, so that the HVAC conditions the area, and aids in the control of high RH.