DAYTON 1C744 18 in Backdraft Damper / Wall Shutter, 18-1/2 in x 18-1/2 in
$73.39
21 In.H-W 5.75 In.L Alu Wall Backdraft Dampr, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity 2500 fpm, Overall Height 21 in, Rough Opening Diameter 18...