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Use with vertical-mounted exhaust fans; shutters open automatically when fan is activated. Galvanized steel frame with felted aluminum louvers for quiet operation. Nylon bushings and stainless steel pivot pins. 9/32" x 1/2" mounting holes. Do not use with vaneaxial or tubeaxial fans.WARNING: Do not use with vaneaxial or tubeaxial fans. Item: Backdraft Damper / Wall Shutter Fits Fan Dia.: 12" Shutter Overall Size: 15" x 15" Shutter Construction Material: G-90 Galvanized Steel Frame and Tie Rods Shutter Opening Required: 12-1/2" x 12-1/2" Shutter Free Area: 0.791 sq. ft. Shutter Mounting Position: Vertical Shutter Mounting Location: Wall Shutter Item: Backdraft Damper / Wall Shutter Frame Depth: 2-1/4" Open Depth: 6-1/4" Flange Width: 1-1/2" Mounting Hole Size: Prepunched Max. Velocity: 2000 FPM Blade Material: Mill Finish Aluminum For Use With: Vertical Mounted Exhaust Fans Number of Panels: 3