Louver Damper Adjustable 60H x 48W

62.5 In.H 50.5 In.W Drnbl Extrd Alu Combo Dmpr Louver Type Combination Frame Type Flanged Outside Height 59 1/2 in Outside Width 47 1/2 in Rough Opening Height 60 in Rough Opening Width 48 in Louver Maximum Intake 10 241 cfm Maximum Exhaust 14 645 cfm Flange Width 1 1/2 in Free Area 9.2 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 45 3/4 in Number of Blades 12