Dayton Intake Louver,Fixed, Drainable,24H x 30W 20UA47

27 In.H 33 In.W Drnbl Extrd Alu Intake Louver, Louver Type Stationary Blade, Frame Type Flanged, Frame Depth 4 in, Mounting Style Surface Mount, Outside Height 23 1/2 in, Outside Width 29 1/2 in, Rough Opening Height 24 in, Rough Opening Width 30 in, Louver Maximum Intake 2,326 cfm, Maximum Exhaust 3,326 cfm, Maximum Outside Width 32 1/2 in, Minimum Outside Width 32 1/2 in, Flange Width 1 1/2 in, Free Area 2.5 sq ft, Beginning Point of Water Penetration 1,031 fpm, Maximum Air Velocity 3500 fpm