Curb Cap For Fan Diameter 21 in For Fan Type Tubeaxial Mounting Hole Diameter 1/2 in Material Steel Body Diameter 23 7/8 in Bolt Circle Diameter 21 1/2 in Finish Baked Enamel For Use With 3NXF4 Maximum Inlet Air Temperature 201 Degrees F Metal Material Thickness 1/2 in Overall Height 6 in Overall Length 31 in Overall Width 31 in Product Type Curb Cap