Establishments primarily engaged in manufacturing industrial process furnaces, ovens, induction and dielectric heating equipment, and related devices. Establishments primarily engaged in manufacturing bakery ovens are classified in Industry 3556; those manufacturing cement, wood, and chemical kilns are classified in Industry 3559; those manufacturing cremating ovens are classified in Industry 3569; and those manufacturing laboratory furnaces and ovens are classified in Industry 3821.

• Calcining kilns (industrial furnaces)
• Ceramic kilns and furnaces
• Core baking and mold drying ovens
• Dielectric heating equipment
• Distillation ovens, charcoal and coke
• Driers and redriers, industrial process
• Enameling ovens
• Furnaces, industrial process
• Heat treating ovens
• Heating equipment, induction
• Heating units and devices, industrial electric
• Incinerators, metal domestic and commercial
• Induction heating equipment
• Infrared ovens, industrial
• Japanning ovens
• Kilns except cement, chemical, and wood
• Lacquering ovens
• Metal melting furnaces, industrial
• Ovens, industrial process except bakery
• Paint baking and drying ovens
• Radiant heating systems, industrial process: e.g., dryers, cookers
• Rubber curing ovens
• Sherardizing ovens
• Smelting ovens
• Vacuum furnaces and ovens