Exhaust Fan Venturi Frame For Blade Diameter 24 in Includes Mounting Bolts Slotted Motor Base Overall Depth 9 in Overall Height 28 in Overall Width 28 in Venturi Depth 3 1/2 in Flange Width 1 in For Cut-Out Height 26 1/2 in For Cut-Out Width 26 1/2 in Frame Finish Galvanized Material Steel Opening Diameter 26 1/2 in