Wall Collar, For Blade Diameter 20 in, For Cut-Out Height 25 5/8 in, For Cut-Out Width 25 5/8 in, Thickness 18, Material Steel, Overall Depth 17 1/2 in, Overall Height 24 1/4 in, Overall Width 24 1/4 in, Finish Galvanized, Includes (4) Mounting Angle,...