• Works in both horizontal or vertical positions Foam seal provides minimal air leakage

The Famco BDS inline butterfly backdraft damper with spring is used as an inline 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 undersized to fit inside round duct. The Famco BDS inline butterfly backdraft damper with spring is available for duct sizes 4 in, 5 in, 6 in, 7 in, 8 in, 10 in. Spec sheet available for download. The Famco BDS inline butterfly backdraft damper with spring is manufactured by Famco in the United States and comes with a 1-year warranty against product defects and workmanship.