Famco BD4 - 4" Galvanized Butterfly Damper for Round Duct
Please Allow 3-7 Business Days Before Shipment, item is made to order.
Warning: Last items in stock!
The FAMCO Butterfly Damper is one of the easiest, least complicated dampers on the market. It is used as a backflow damper in forced air systems, solar systems and exhaust/intake systems. It has no metal hinges or springs to rust or break and is maintenance free. The BD has a foam seal providing minimal air leakage. Due to its unique design it opens easily with normal air flow - closes by gravity. It will work in either horizontal or vertical positions (except vertical down).
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