Intake Louver Fixed Drainable 24H x 42W

27 In.H 45 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 41 1/2 in Rough Opening Height 24 in Rough Opening Width 42 in Louver Maximum Intake 3 359 cfm Maximum Exhaust 4 804 cfm Maximum Outside Width 44 1/2 in Minimum Outside Width 44 1/2 in Flange Width 1 1/2 in Free Area 3.5 sq ft Beginning Point of Water Penetration 1 031 fpm Maximum Air Velocity 3500 fpm