Louver Damper Adjustable 36H x 60W

38.5 In.H 62.5 In.W Drnbl Extrd Alu Combo Dmpr Louver Type Combination Frame Type Flanged Outside Height 35 1/2 in Outside Width 59 1/2 in Rough Opening Height 36 in Rough Opening Width 60 in Louver Maximum Intake 7 330 cfm Maximum Exhaust 10 482 cfm Flange Width 1 1/2 in Free Area 6.6 sq ft Beginning Point of Water Penetration 1 118 fpm Maximum Air Velocity 3000 fpm Blade Angle 45 Degrees Material Aluminum Inside Height 34 1/2 in Inside Width 57 3/4 in Number of Blades 7