Spring Loaded Backdraft Dampers • 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 - 22°F to180°F • Require from 0.04 to 0.08 inches W.G. to begin to open • May be installed in any position.
