Louver Damper, Adjustable, 54H x 60W, DAYTON, Mfr# 20UC39

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