DAYTON 4C558 18 in Backdraft Damper / Wall Shutter, 18-1/2 in x 18-1/2 in
$79.45
21 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 1, Maximum Air Velocity 2500 fpm, Overall Height 21 in, Rough Opening Diameter 18 1/2 in,...