Backdraft damper with galvanized steel collar and lightweight aluminum damper blades. Spring loaded for positive closure. Fits 14" 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.
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