DAYTON 4FZH6 20 in Backdraft Damper / Wall Shutter, 20-1/2 in x 20-1/2 in
$139.99
23 In.H-W 6.5 In.L Extrd Alu Backdraft Dampr, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Aluminum, Number of Panels 1, Maximum Air Velocity 3250 fpm, Overall Height 23 in, Rough Opening Diameter 20 1/2 in,...