Dayton Louver,Intake,24-42 In,Galvanized Steel 4F423

46 In.H 28 In.W Non-Drnbl GSteel Intake Louver, Louver Type Stationary Blade, Frame Type Flanged, Frame Depth 4 in, Mounting Style Surface Mount, Outside Height 46 in, Outside Width 28 in, Rough Opening Height 42 in, Rough Opening Width 24 in, Louver Maximum Intake 4,290 cfm, Maximum Exhaust 6,125 cfm, Maximum Outside Width 46 in, Minimum Outside Width 28 in, Flange Width 2 in, Free Area 5.6 sq ft, Beginning Point of Water Penetration 766 fpm, Maximum Air Velocity 3000 fpm