Louver Damper Adjustable 54H x 60W

56.5 In.H 62.5 In.W Drnbl Extrd Alu Combo Dmpr Louver Type Combination Frame Type Flanged Outside Height 53 1/2 in Outside Width 59 1/2 in Rough Opening Height 54 in Rough Opening Width 60 in Louver Maximum Intake 11 423 cfm Maximum Exhaust 16 335 cfm Flange Width 1 1/2 in Free Area 10.2 sq ft Beginning Point of Water Penetration 1 118 fpm Maximum Air Velocity 3000 fpm Blade Angle 45 Degrees Material Aluminum Inside Height 52 1/2 in Inside Width 57 3/4 in Number of Blades 11