Heavy Duty Wall Collar For Blade Diameter 54 in For Cut-Out Height 61 3/4 in For Cut-Out Width 61 3/4 in Thickness 16 Material Steel Overall Depth 23 1/2 in Overall Height 60 1/2 in Overall Width 60 1/4 in Finish Galvanized Includes (4) Mounting Angle (4) Side Panel