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.: 24"
Shutter Overall Size: 27" x 27"
Shutter Construction Material: G-90 Galvanized Steel Frame and Tie Rods
Shutter Opening Required: 24-1/2" x 24-1/2"
Shutter Free Area: 3.330 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: 1