No. 862 is a gas-heated 2000°F furnace from Grieve Corp. currently used for preheating dies and molds. The furnace features 750,000 BTU/hour installed in four modulating natural gas burners with a floor-mounted combustion air blower. Workspace dimensions are 36 inches wide x 48 inches deep x 36 inches high. The unit has 7-inch-thick insulated walls, comprised of 5 inches of 2300°F ceramic fiber and 2 inches of block insulation. The 7-inch floor insulation contains 4 ½ inches of 2300°F firebrick and 2 ½ inches of block insulation. Controls include an automatic door switch to drive burners to low fire when the door is opened and an air-operated vertical lift door. All safety equipment required by the IRI, FM and National Fire Protection Association Standard 86 for gas-heated furnaces is also included.