DAYTON 1C745 20 in Backdraft Damper / Wall Shutter, 20-1/2 in x 20-1/2 in
$78.69
23 In.H-W 5.75 In.L Alu Wall Backdraft Dampr, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Galvanized Steel, Numb