Louver Damper, Adjustable, 42H x 54W, DAYTON, Mfr# 20UC30

44.5 In.H 56.5 In.W Drnbl Extrd Alu Combo Dmpr, Louver Type Combination, Frame Type Flanged, Outside Height 41 1/2 in, Outside Width 53 1/2 in, Rough Opening Height 42 in, Rough Opening Width 54 in, Louver Maximum Intake 7,697 cfm, Maximum Exhaust 11,006 cfm, Flange Width 1 1/2 in, Free Area 6.9 sq ft, Beginning Point of Water Penetration 1,118 fpm, Maximum Air Velocity 3000 fpm, Blade Angle 45 Degrees , Material Aluminum, Inside Height 40 1/2 in, Inside Width 51 3/4 in, Number of Blades 9