Louver Damper, Adjustable, 54H x 42W, DAYTON, Mfr# 20UC17

56.5 In.H 44.5 In.W Drnbl Extrd Alu Combo Dmpr, Louver Type Combination, Frame Type Flanged, Outside Height 53 1/2 in, Outside Width 41 1/2 in, Rough Opening Height 54 in, Rough Opening Width 42 in, Louver Maximum Intake 7,816 cfm, Maximum Exhaust 11,177 cfm, Flange Width 1 1/2 in, Free Area 7 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 39 3/4 in, Number of Blades 11