best deal Aldes 8" Backdraft Damper - BDD8
Backdraft damper with galvanized steel collar and lightweight aluminum damper blades. Spring loaded for positive closure. Fits 8" Round Duct • 20 gauge galvanized steel housing• Aluminum spring loaded butterfly damper blades• Damper seals against EDPM rubber gasket in closed position for minimal leakage• Gasket designed for use in temperatures from - 22F to 180F• Require from 0.04 to 0.08 inches W.G. to begin to open• May be installed in any position. • Simple installation - entire assembly inserts into duct• Exterior foam gaskets assure a tight seal against interior surfac
Aldes 8" Backdraft Damper - BDD8
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