Louver, Intake, 36-48 In, Aluminum, DAYTON, Mfr# 4F956

40 In.H 40 In.W Non-Drnbl Alu Intake Louver, Louver Type Stationary Blade, Frame Type Flanged, Frame Depth 4 in, Mounting Style Surface Mount, Outside Height 40 in, Outside Width 40 in, Rough Opening Height 36 in, Rough Opening Width 36 in, Louver Maximum Intake 4,200 cfm, Maximum Exhaust 6,000 cfm, Maximum Outside Width 52 in, Minimum Outside Width 40 in, Flange Width 2 in, Free Area 4.8 sq ft, Beginning Point of Water Penetration 766 fpm, Maximum Air Velocity 3000 fpm, Blade Angle 45 Degrees