Intake Louver,Fixed, Drainable,42H x 36W
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 35 1/2 in, Rough Opening Height 42 in, Rough Opening Width 36 in, Louver Maximum Intake 5,685 cfm, Maximum Exhaust 8,130 cfm, Maximum Outside Width 38 1/2 in, Minimum Outside Width 38 1/2 in, Flange Width 1 1/2 in, Free Area 5.2 sq ft, Beginning Point of Water Penetration 1,031 fpm, Maximum Air Velocity 3500 fpm.