24 Inch Mill Finish Aluminum Fan Shutter - Durable & Rustproof for Home, Garage, and Industrial Ventilation

Backdraft Damper / Intake Shutter, Fits Fan Dia. 24 In., Shutter Overall Size 26-3/4 In. x 26-3/4 In., Shutter Construction Material Extruded Aluminum Frame and G-90 Galvanized Tie Rods, Shutter Opening Required 25 In. x 25 In., Shutter Free Area 3.221 sq. ft., Vertical Shutter Mounting Position, Shutter Mounting Location Wall, Frame Depth 1-19/32 In., Open Depth 6 In., Flange Width 1-1/2 In., Mounting Hole Size Prepunched, Max. Velocity 2250 FPM, Blade Material Mill Finish Aluminum