333994 Industrial Process Furnace and Oven Manufacturing

Official definition

This U.S. industry comprises establishments primarily engaged in manufacturing industrial process ovens, induction and dielectric heating equipment, and kilns (except cement, chemical, wood). Included in this industry are establishments manufacturing laboratory furnaces and ovens.

Source: US Census Bureau, 2022 NAICS descriptions.

When to use a different code

Census classifies these close-sounding activities somewhere else. Businesses mainly engaged in:

• Manufacturing bakery ovens are classified in U.S. Industry 333241, Food Product Machinery Manufacturing.
• Manufacturing cement, wood, and chemical kilns are classified in U.S. Industry 333248, All Other Industrial Machinery Manufacturing.
• Manufacturing cremating ovens are classified in U.S. Industry 333998, All Other Miscellaneous General Purpose Machinery Manufacturing.

Source: US Census Bureau, 2022 NAICS cross-references.

Activities listed under 333994

The Census index assigns these 21 activities to this code. If your business matches one, this is your code.

• Ceramic kilns and furnaces manufacturing
• Core baking and mold drying ovens manufacturing
• Dielectric industrial heating equipment manufacturing
• Distillation ovens, charcoal and coke, manufacturing
• Enameling ovens manufacturing
• Furnaces and ovens for drying and redrying, industrial process-type, manufacturing
• Furnaces and ovens, semiconductor wafer, manufacturing
• Furnaces, industrial and laboratory-type (except dental), manufacturing
• Garbage incinerators (except precast concrete) manufacturing
• Heat treating ovens, industrial process-type, manufacturing
• Incinerators (except precast concrete) manufacturing
• Induction heating equipment, industrial process-type, manufacturing
• Infrared ovens, industrial, manufacturing
• Japanning ovens manufacturing
• Kilns (except cement, chemical, wood) manufacturing
• Lacquering ovens manufacturing
• Metal melting furnaces, industrial, manufacturing
• Ovens, industrial process and laboratory-type, manufacturing
• Paint baking and drying ovens manufacturing
• Smelting ovens manufacturing
• Tile making kilns manufacturing

Source: US Census Bureau, 2022 NAICS index file.

SBA size standard for 333994

To count as a small business for SBA loans and federal contracts under NAICS 333994, your business (including affiliates) must not exceed 500 employees. Check your business.

Source: SBA table of size standards, effective March 17, 2023.

Closest UK SIC 2007 codes

There is no official one-to-one link between NAICS and UK SIC. These codes share the same international class (ISIC Rev. 4: 2815), so treat them as a starting point and check the definition.

• 28150Manufacture of bearings, gears, gearing and driving elementsUK SIC

Built from Census concordances 2022→2017 NAICS and 2017 NAICS→ISIC Rev. 4.

Similar codes to compare

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• 333998All Other Miscellaneous General Purpose Machinery Manufacturing