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