23.75 In.H-W 4.5 In.L Alu Univ Backdraft Dampr, Damper Application Backdraft, For Nominal Duct Diameter 24 in, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity 2000 fpm, Overall Height 23 3/4 in, Rough Opening Diameter 24...
23.75 In.H-W 4.5 In.L Alu Univ Backdraft Dampr, Damper Application Backdraft, For Nominal Duct Diameter 24 in, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity 2000 fpm, Overall Height 23 3/4 in, Rough Opening Diameter 24...