The Furnace Box itself is constructed of Structural Steel and Sheet Metal. The box could be fixed, lifting, or rolling depending on furnace type and is fully insulated.  The Insulation is usually a combination of Fire Brick, High Temperature Mineral Wool batts, and AES Blanket.  6” of total insulation thickness is used minimize heat losses and protect the structural integrity of the box.

The Drawn Arc Stud Welding process is used in conjunction with Insultwist Pins to secure the insulation to the interior of the furnace.