Exhaust Fan Venturi Frame For Blade Diameter 20 in Includes Mounting Bolts Slotted Motor Base Overall Depth 9 in Overall Height 24 in Overall Width 24 in Venturi Depth 3 in Flange Width 1 in For Cut-Out Height 22 1/2 in For Cut-Out Width 22 1/2 in Frame Finish Galvanized Material Steel Opening Diameter 22 1/2 in