Louver Damper Adjustable 60H x 42W

62.5 In.H 44.5 In.W Drnbl Extrd Alu Combo Dmpr Louver Type Combination Frame Type Flanged Outside Height 59 1/2 in Outside Width 41 1/2 in Rough Opening Height 60 in Rough Opening Width 42 in Louver Maximum Intake 8 876 cfm Maximum Exhaust 12 692 cfm Flange Width 1 1/2 in Free Area 7.9 sq ft Beginning Point of Water Penetration 1 118 fpm Maximum Air Velocity 3000 fpm Blade Angle 45 Degrees Material Aluminum Inside Height 58 1/2 in Inside Width 39 3/4 in Number of Blades 12