Dayton Intake Louver,Fixed, Drainable,42H x 60W 20UA83

45 In.H 63 In.W Drnbl Extrd Alu Intake Louver, Louver Type Stationary Blade, Frame Type Flanged, Frame Depth 4 in, Mounting Style Surface Mount, Outside Height 41 1/2 in, Outside Width 59 1/2 in, Rough Opening Height 42 in, Rough Opening Width 60 in, Louver Maximum Intake 9,820 cfm, Maximum Exhaust 14,043 cfm, Maximum Outside Width 62 1/2 in, Minimum Outside Width 62 1/2 in, Flange Width 1 1/2 in, Free Area 9.1 sq ft, Beginning Point of Water Penetration 1,031 fpm, Maximum Air Velocity 3500 fpm