Best Seller | DAYTON 3HHT1 30 in Backdraft Damper / Intake Shutter, 31 in x 31 in 32.75 In.H-W Alu Universal Backdraft Dampr, Frame Material Aluminum, Number of Panels 1, Maximum Air Velocity 2250 fpm, Overall Height 32 3/4 in, Rough Opening Shape Square, Fits Fan Diameter 30 in, Free Area 4.8 sq ft, Overall Width 32 3/4 in, Frame... ... more DAYTON 3HHT1 30 in Backdraft Damper / Intake Shutter, 31 in x 31 in 32.75 In.H-W Alu Universal Backdraft Dampr, Frame Material Aluminum, Number of Panels 1, Maximum Air Velocity 2250 fpm, Overall Height 32 3/4 in, Rough Opening Shape Square, Fits Fan Diameter 30 in, Free Area 4.8 sq ft, Overall Width 32 3/4 in, Frame... | | $191.99 go to store |