Box Furnace

No. 871 is a 2000°F gas-heated box furnace used for heat treating and high-temperature testing. Workspace dimensions are 30 inches wide x 48 inches deep x 30 inches high, and 650,000 BTU/hour are installed in three modulating natural gas burners with a floor-mounted combustion air blower. The unit has 7-inch insulated walls comprised of 5 inches of 2300°F ceramic fiber and 2 inches of 1700°F block insulation. The 6.5-inch floor insulation is made of 4.5 inches of 2300°F firebrick and 2 inches of 1900°F block insulation. The plate hearth is made of firebrick and is supported by firebrick piers. Controls include a Partlow MRC 7000 recording and programming temperature controller.