Intake Louver Fixed Drainable 54H x 42W

57 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 53 1/2 in Outside Width 41 1/2 in Rough Opening Height 54 in Rough Opening Width 42 in Louver Maximum Intake 8 735 cfm Maximum Exhaust 12 491 cfm Maximum Outside Width 44 1/2 in Minimum Outside Width 44 1/2 in Flange Width 1 1/2 in Free Area 8.5 sq ft Beginning Point of Water Penetration 1 031 fpm Maximum Air Velocity 3500 fpm