Louver Damper Adjustable 60H x 60W

63 In.H 63 In.W Drnbl Extrd Alu Combo Dmpr Louver Type Combination Frame Type Flanged Outside Height 59 1/2 in Outside Width 59 1/2 in Rough Opening Height 60 in Rough Opening Width 60 in Louver Maximum Intake 12 972 cfm Maximum Exhaust 18 550 cfm Flange Width 1 1/2 in Free Area 11.6 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 57 3/4 in Number of Blades 12