No. 943 is an electrically heated, 2000°F top-loading pit furnace that can be used for a variety of heat-treating applications. Workspace dimensions measure 24 inches wide x 24 inches deep x 24 inches high. Nickel chrome wire coils supported by vacuum-formed ceramic fiber, supply 26-kW of heat to the workload. The furnace has 7-inch-thick insulated walls (5 inches of 2300°F ceramic-fiber blanket and 2 inches of block insulation), and a 6.5-inch-thick floor is made of castable refractory materials. Safety equipment includes an adjustable, thermocouple-actuated, manual reset excess temperature controller; separate heating-element control contactors; an air-operated vertical lift door; and a door interlock switch.