Louver Damper, Adjustable, 24H x 36W, DAYTON, Mfr# 20UA25

27 In.H 36 In.W Drnbl Extrd Alu Combo Dmpr, Louver Type Combination, Frame Type Flanged, Outside Height 23 1/2 in, Outside Width 35 1/2 in, Rough Opening Height 24 in, Rough Opening Width 36 in, Louver Maximum Intake 2,610 cfm, Maximum Exhaust 3,733 cfm, Flange Width 1 1/2 in, Free Area 2.3 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 33 3/4 in, Number of Blades 4