Intake Louver Fixed Drainable 48H x 36W

39 In.H 39 In.W Drnbl Extrd Alu Intake Louver Louver Type Stationary Blade Frame Type Flanged Frame Depth 4 in Mounting Style Surface Mount Outside Height 47 1/2 in Outside Width 35 1/2 in Rough Opening Height 48 in Rough Opening Width 48 in Louver Maximum Intake 6 254 cfm Maximum Exhaust 8 943 cfm Maximum Outside Width 38 1/2 in Minimum Outside Width 38 1/2 in Flange Width 1 1/2 in Free Area 6 sq ft Beginning Point of Water Penetration 1 031 fpm Maximum Air Velocity 3500 fpm