Louver Damper, Adjustable, 24H x 54W, DAYTON, Mfr# 20UC27

26.5 In.H 56.5 In.W Drnbl Extrd Alu Combo Dmpr, Louver Type Combination, Frame Type Flanged, Outside Height 23 1/2 in, Outside Width 53 1/2 in, Rough Opening Height 24 in, Rough Opening Width 54 in, Louver Maximum Intake 4,034 cfm, Maximum Exhaust 5,769 cfm, Flange Width 1 1/2 in, Free Area 3.6 sq ft, Beginning Point of Water Penetration 1,118 fpm, Maximum Air Velocity 3,000 fpm, Blade Angle 45 Degrees , Material Aluminum, Inside Height 22 1/2 in, Inside Width 51 3/4 in, Number of Blades 4