Includes
Crucible Furnaces; Cupola Furnaces.

Excludes
Food Industry Ovens (FSC 7310); Metal Heat Treating Furnaces (FSC 3424); Laboratory Type Furnaces (FSC 6640).

Possible NAICS Codes
333994 – Industrial Process Furnace and Oven Manufacturing
325998 – All Other Miscellaneous Chemical Product and Preparation Manufacturing
334516 – Analytical Laboratory Instrument Manufacturing
333310 – Commercial and Service Industry Machinery Manufacturing
541330 – Engineering Services
333415 – Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing
333414 – Heating Equipment (except Warm Air Furnaces) Manufacturing
333248 – All Other Industrial Machinery Manufacturing
332510 – Hardware Manufacturing
339113 – Surgical Appliance and Supplies Manufacturing