Backdraft Damper / Wall Shutter, Fits Fan Dia. 12 in, Shutter Overall Size 17 in x 17 in, Shutter Construction Material Extruded Aluminum Frame and G-90 Galvanized Tie Rods, Shutter Opening Required 14-1/2 in x 14-1/2 in, Shutter Free Area 0.927 sq ft, Vertical Shutter Mounting Position, Shutter Mounting Location Wall, Length 17 in, Width 17 in, Frame Depth 2 1/2 in, Open Depth 5 3/4 in, Flange Width 1 1/2 in, Mounting Hole Size 9/64 in, Max. Velocity 2500 FPM. This item has been restricted from sale in the following state (s): []