April 2013 - The HA7-A9 bench style box furnace for heat treating components heats to 1,850 degrees F, and temperature is regulated with a Honeywell microprocessor-based digital time proportioning controller. Heavy-gauge coiled low-watt density element wire provides uniform heat. Built with 5-in. insulating brick and mineral wool block, the insulation is dry fit for better refractory expansion, contraction and replacement. The horizontal swing door is constructed of heavy-gauge steel to withstand distortion and has a heavy-duty hinge and cam latch for a tight seal.