41.75 In.H-W 4.5 In.L Aluminum Backdraft Dampr, Damper Application Backdraft, For Nominal Duct Diameter 42 in, Frame Material Galvanized Steel, Number of Panels 1, Maximum Air Velocity 2000 fpm, Overall Height 41 3/4 in, Rough Opening Diameter 42 in, Rough Opening Shape Square, Fits Fan Diameter 42 in, For Duct Shape Square, Free Area 10.9 sq ft, Overall Width 41 3/4 in, Frame Material Thickness 20 ga, Overall Length 4 1/2 in, Frame Depth 2 in, Rough Opening Length 42 in