Backdraft Damper / Wall Shutter, Fits Fan Dia. 20 in, Shutter Overall Size 25 in x 25 in, Shutter Construction Material G-90 Galvanized Steel Frame and Tie Rods, Shutter Opening Required 22-1/2 in x 22-1/2 in, Shutter Free Area 2.527 sq ft, Vertical Shutter Mounting Position, Shutter Mounting Location Wall, Length 25 in, Width 25 in, Frame Depth 2 1/4 in, Open Depth 6 1/4 in, Flange Width 1 1/2 in, Mounting Hole Size 9/64 in, Max. Velocity 2500 FPM, Blade Material Mill Finish Aluminum.
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