No. 854 is a special high-temperature, 2,200 degrees F electrically-heated, inert atmosphere floor furnace from Grieve, currently used for various heat treating applications at a customer’s facility. Workspace dimensions measure 24” wide x 48” deep x 24” high. 53 KW installed in heavy-gauge, high-temperature Kanthal AF alloy wire, rod overbend design heaters provide maximum operating temperatures to 2,200 degrees F. This Grieve furnace features 9” insulated walls, consisting of 4 ½” thick 2,600 degrees F firebrick, 2 ½” thick 2,300 degrees F firebrick and 2” thick block insulation.  A firebrick plate hearth is supported on firebrick piers.  An electrically-operated vertical lift door is provided, with remote foot pedal control. Special inert atmosphere construction on No. 854 includes a continuously welded outer shell, high-temperature door gasket, sealed heater terminal boxes, inert atmosphere inlet, outlet and flowmeter. Safety and control equipment on-board this Grieve furnace include a digital indicating temperature controller, manual reset excess temperature controller with separate contactors and a four-channel strip chart recorder.