26 In.H 32 In.W Aluminum Ceiling Fan Damper, Frame Material Aluminum, Number of Panels 1, Maximum Air Velocity 1500 fpm, Overall Height 26 in, Rough Opening Shape Rectangular, Fits Fan Diameter 24 in, Free Area 3.3 sq ft, Overall Width 32 in, Frame Material Thickness 0.1 in, Frame Depth 1 3/8 in, Rough Opening Length 24 in, Maximum Pressure 1 in wc, Rough Opening Width 30 in, Blade Material Aluminum, Closure Type Gravity, Flange Width 1 5/8 in