Discharge Cap For Fan Diameter 30 in For Fan Type Tubeaxial Mounting Hole Diameter 1/2 in Material Galvanized Steel Body Diameter 38 in Bolt Circle Diameter 30 1/2 in Finish Unfinished For Use With 3C412 4TM86 Includes Clam Shell Damper Maximum Inlet Air Temperature 200 Degrees F Metal Material Thickness 1/2 in Overall Height 32 1/8 in Overall Length 38 in Overall Width 38 in Product Type Discharge Cap