No. 885 is a 1400 degree F electric, inert atmosphere tempering furnace from Grieve (Round Lake, IL), used for heat treating weldments at a customer’s facility. Workspace dimensions of this unit measure 24 x 36 x 24 inches. 42 kW installed in nickel chrome wire coils, supported by a stainless steel frame, heat the workspace, while a heat resistant alloy recirculating blower, powered by a 5-HP motor, provides vertical downward airflow to the workload. This tempering furnace features 7-inch thick insulated walls, comprising 1 inch of 2300 degree °F ceramic fiber blanket, 2 inches of 1700 degree F ceramic fiber blanket, 2 inches of block insulation, and 2 inches of rockwool insulation. No. 885 has an electrically-operated vertical lift door with an automatic door switch to shut off the heaters when the door is opened.
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