43.6 In.H Alum Vertical Intake Shutter Frame Material Aluminum Number of Panels 2 Maximum Air Velocity 2000 fpm Overall Height 43 5/8 in Fits Fan Diameter 36 in Free Area 10.6 sq ft Overall Width 42 1/4 in Frame Depth 2 in Blade Material Aluminum Flange Width 1 3/8 in