DAYTON 3C311 42 in Backdraft Damper / Wall Shutter, 42-1/2 in x 42-1/2 in
$245.99
45 In.H-W 5.75 In.L Aluminum Backdraft Damper, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Aluminum, Number of Panels 2, Maximum Air Velocity 2500 fpm, Overall Height 45 in, Rough Opening Diameter 42 1/2 in,...