36 in Agricultural Wall Exhaust Shutter, 39-1/2 in x 39-1/2 in, DAYTON, Mfr# 45C666

42 In.H-W 5.75 In.L Aluminum Exhaust Shutter, Damper Application Backdraft, For Nominal Duct Diameter Not Applicable, Frame Material Aluminum, Number of Panels 2, Maximum Air Velocity 2500 fpm, Overall Height 42 in, Rough Opening Diameter 39 1/2 in, Rough Opening Shape Square, Fits Fan Diameter 36 in, For Duct Shape Not Applicable, Free Area 10.3 sq ft, Overall Width 42 in, Frame Material Thickness 20 ga, Overall Length 5 3/4 in, Connection Type Not Applicable, Frame Depth 2 1/4 in