18 in Backdraft Damper / Wall Shutter, 18-1/2 in x 18-1/2 in

Backdraft Damper / Wall Shutter, Fits Fan Dia. 18 in, Shutter Overall Size 21 in x 21 in, Shutter Construction Material G-90 Galvanized Steel Frame and Tie Rods, Shutter Opening Required 18-1/2 in x 18-1/2 in, Shutter Free Area 2.051 sq ft, Vertical Shutter Mounting Position, Shutter Mounting Location Wall, Frame Depth 2 1/4 in, Open Depth 6 1/4 in, Flange Width 1 1/2 in, Mounting Hole Size Prepunched, Max. Velocity 2000 FPM, Blade Material Mill Finish Aluminum

• Mfr #: 2C521
• Item: Backdraft Damper / Wall Shutter
• Shutter Mounting Position: Vertical
• Shutter Mounting Location: Wall
• Shutter Construction Material: G-90 Galvanized Steel Frame and Tie Rods
• Shutter Free Area: 2.051 sq ft
• Shutter Opening Required: 18-1/2 in x 18-1/2 in
• Shutter Overall Size: 21 in x 21 in
• Fits Fan Dia.: 18 in
• Blade Material: Mill Finish Aluminum
• Max. Velocity: 2000 fpm
• For Use With: Vertical Mounted Exhaust Fans
• Mounting Hole Size: Prepunched
• Open Depth: 6 1/4 in
• Frame Opening A: 18 in
• Frame Depth: 2 1/4 in
• Number of Panels: 1
• Flange Width: 1 1/2 in
• Shutter Overall Square: 21" x 21"
• Frame Opening B: 18 in
• Shutter Item: Backdraft Damper / Wall Shutter