DAYTON 4YN19 48 in 50.75"H-W 4.5"L Alu Intake Shutter Dampr, 49 in x 49 in,
50.75 In.H-W 4.5 In.L Alu Intake Shutter Dampr, For Nominal Duct Diameter Not Applicable, Frame Material Aluminum, Number of Panels 1, Maximum Air Velocity 2250 fpm, Overall Height 50 3/4 in, Rough Opening Diameter 49 in, Rough Opening Shape Square,...