NAICS 333994

Overview

The North American Industry Classification System (NAICS) is the federal standard for classifying business establishments to produce statistical data about the U.S. economy. Developed under the Office of Management and Budget and adopted in 1997, NAICS is updated on a five-year cycle; the current vintage is 2022. ¹

Under the 2022 NAICS structure, 333994 Industrial Process Furnace and Oven Manufacturing comprises establishments primarily engaged in manufacturing industrial process furnaces, ovens, induction and dielectric heating equipment, and kilns other than those for cement, chemical, or wood applications. Federal statistical programs use this code to tabulate industry data in the Economic Census and related series. ²

See also on G2X:

• G2X — NAICS 333994 overview
• G2X — NAICS 333298
• G2X — NAICS 339111

What this NAICS covers

• Manufacture of industrial process furnaces for treating materials in production settings. ²
• Manufacture of industrial process ovens for drying, curing, or similar process uses. ²
• Manufacture of induction heating equipment for industrial processing. ²
• Manufacture of dielectric (radio-frequency) heating equipment for industrial processing. ²
• Manufacture of kilns, except those designed for cement, chemical, or wood applications. ²
• Industrial heating systems and components integrated into process furnaces and ovens, where such systems are part of the finished equipment classified in this industry. ²

Related NAICS and PSC codes

Verified by Census NAICS cross-references. ²

Data availability and reporting under 2022 NAICS

• Census began publishing data on the 2022 NAICS basis with the 2022 Economic Census “First Look” in January 2024; broader program adoption is planned through 2027. ³
• Programs that maintain time series generally restate historical estimates to align with 2022 NAICS where feasible, with methods described in each program’s documentation. ³

Frequently asked questions

• What products and equipment fall within NAICS 333994?

  • Establishments classified here manufacture industrial process furnaces and ovens, induction and dielectric (RF) heating equipment, and kilns not designed for cement, chemical, or wood applications. Products are intended for production environments, supporting material treatment, curing, drying, and heat-processing operations in industrial settings. ²

• Are bakery ovens or cement/wood/chemical kilns included in 333994?

  • No. Commercial bakery ovens are classified in 333294. Kilns designed for cement, wood, or chemical processes are classified in 333298. NAICS 333994 excludes these application-specific kiln types and focuses on process furnaces, ovens, and industrial heating equipment for general manufacturing uses. ²

• Are laboratory furnaces and ovens part of 333994?

  • No. Laboratory furnaces and ovens are classified under 339111, which covers laboratory apparatus and furniture. NAICS 333994 applies to equipment designed for industrial production processes, not lab-scale testing or research environments where specialized laboratory-grade devices are used. ²

• Were there 2017→2022 content changes specific to NAICS 333994?

  • Not specified by official sources. ³

• Where can official 2022 data for NAICS 333994 be found?

  • Use the Economic Census Sector 31–33: Manufacturing page for 2022 data releases and tables. Then search or filter for industry 333994 on data.census.gov to retrieve profile tables, datasets, and related materials covering this industry’s activity and establishments. ⁴

Useful resources

• G2X — NAICS 333994
• U.S. Census Bureau — NAICS 333994 industry description and cross-references. ²
• U.S. Census Bureau — Implementation of the 2022 NAICS (timeline and impacts). ³
• U.S. Census Bureau — 2022 NAICS Sector 31–33: Manufacturing (Economic Census data). ⁴
• U.S. Census Bureau — Economic Census: NAICS Codes & Understanding Industry Classification Systems. ⁵

References

1. U.S. Census Bureau. NAICS — Official site. https://www.census.gov/naics/
2. U.S. Census Bureau. NAICS 2022 Search — 333994 Industrial Process Furnace and Oven Manufacturing. https://www.census.gov/naics/?input=333994&year=2022&details=333994
3. U.S. Census Bureau. The Census Bureau’s Implementation of the 2022 North American Industry Classification System (NAICS). https://www.census.gov/library/reference/code-lists/naics/2022/implementation-timeline.html
4. U.S. Census Bureau. 2022 NAICS Sector 31–33 — Manufacturing (Economic Census). https://www.census.gov/data/tables/2022/econ/economic-census/naics-sector-31-33.html
5. U.S. Census Bureau. Economic Census: NAICS Codes & Understanding Industry Classification Systems. https://www.census.gov/programs-surveys/economic-census/year/2022/technical-documentation/code-lists/understanding-naics-redirect.html