The XSB box furnaces have a hinged vertical lift door that keeps the hot door insulation always facing away from the operator. A door safety switch interrupts power to the heating elements when the door is opened.
These furnaces use Fibercraft™ vacuum formed ceramic fiber heating elements with free radiating wire embedded into the body of the heater. The furnace chamber, heating elements, hearth plate and chamber threshold are designed to be easily replaced if they become worn out.
An air gap between the heated chamber exterior and furnace exterior surface is designed to minimize the external surface temperature of the furnace.
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