Curb Cap For Fan Diameter 16 in For Fan Type Tubeaxial Mounting Hole Diameter 1/2 in Material Steel Bolt Circle Diameter 17 1/2 in Compatible Curb Grainger Part Number 2RB77 4HX40 4HX48 Finish Baked Enamel For Use With 4C660 4TM81 Maximum Inlet Air Temperature 200 Degrees F Overall Height 6 in Overall Length 26 in Overall Width 26 in Product Type Curb Cap