Louver, Intake, 24-36 In, Galvanized Steel, DAYTON, Mfr# 3C974

40 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 40 in, Outside Width 28 in, Rough Opening Height 36 in, Rough Opening Width 24 in, Louver Maximum Intake 3,150 cfm, Maximum Exhaust 4,500 cfm, Maximum Outside Width 40 in, Minimum Outside Width 28 in, Flange Width 2 in, Free Area 3.6 sq ft, Beginning Point of Water Penetration 766 fpm, Maximum Air Velocity 3000 fpm