- Heating units and devices, industrial: electric (5)
- Metal melting furnaces, industrial: electric (1)
- Metal melting furnaces, industrial: fuel-fired (1)
- Induction heating equipment (3)
- Driers and redriers, industrial process (3)
- Incinerators, metal: domestic or commercial (3)
- Infrared ovens, industrial (3)
- Paint baking and drying ovens (2)
- Radiant heating systems, industrial process (3)
- Vacuum furnaces and ovens (3)
