The six Hard Cast Heaters used to power this 30” wide x 18” tall x 36” deep front loaded box furnace, are of the embedded wire type. The 480 V three phase HCH set delivers 60 KW of power, an average of 2500 watts per square foot. This 11.25 cubic foot production furnace is fired to 1100 °C two to three times a week. The roof and wall heaters are set up to radiate directly into the furnace chamber. The two heaters on the floor are oriented to radiate into a space below the heater. The roof is suspended by refractory hangers which are supported on the outside roof structure.