Exhaust Fan Venturi Frame For Blade Diameter 36 in Includes Mounting Bolts Slotted Motor Base Overall Depth 10 1/2 in Overall Height 40 in Overall Width 40 in Venturi Depth 5 in Flange Width 1 in For Cut-Out Height 38 1/2 in For Cut-Out Width 38 1/2 in Frame Finish Galvanized Material Steel Opening Diameter 38 1/2 in