DAYTON 1C210 42 in Backdraft Damper / Wall Shutter, 42-1/2 in x 42-1/2 in
$335.99
45 In.H-W 5.75 In.L Alu Wall Vent Shutter, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Galvanized Steel, Number of Panels 2, Maximum Air Velocity 2500 fpm, Overall Height 45 in, Rough Opening Diameter 42...