Curb Cap For Fan Diameter 48 in For Fan Type Tubeaxial Mounting Hole Diameter 1/2 in Material Steel Body Diameter 56 1/4 in Bolt Circle Diameter 48 1/2 in Compatible Curb Grainger Part Number 4HX45 4HX53 Finish Baked Enamel For Use With 3C416 Maximum Inlet Air Temperature 200 Degrees F Metal Material Thickness 5/8 in Overall Height 6 in Overall Length 57 in Overall Width 57 in Product Type Curb Cap