333994 — Industrial Process Furnace and Oven Manufacturing
Description
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.
Exclusions & Cross-References
- 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; and
- Manufacturing cremating ovens--are classified in U.S. Industry 333998, All Other Miscellaneous General
- Purpose Machinery Manufacturing.
Overview Facts
| NAICS Code | 333994 |
|---|---|
| Industry Title | Industrial Process Furnace and Oven Manufacturing |
| SBA Size Standard | 500 employees |
| IRS PBA Code | 333900 (rolled-up match) |
| Sectors Hierarchy | Sector 31-33 → 333 → 3339 |
| Source / Verified | US Census 2022 NAICS Manual / 2026-06-28 |
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 2599 - Furniture and Fixtures, NEC (via SIC1987:2599→NAICS1997:339111→2002:339111→2007:333994→2012:333994→2017:333994→2022:333994)
- SIC 3567 - Industrial Process Furnaces and Ovens (via SIC1987:3567→NAICS1997:333994→2002:333994→2007:333994→2012:333994→2017:333994→2022:333994)
- SIC 3821 - Laboratory Apparatus and Furniture (via SIC1987:3821→NAICS1997:339111→2002:339111→2007:333994→2012:333994→2017:333994→2022:333994)
- SIC 3841 - Surgical and Medical Instruments and Apparatus (via SIC1987:3841→NAICS1997:339111→2002:339111→2007:333994→2012:333994→2017:333994→2022:333994)
Related Resources & Compliance Guides
Further regulatory reference links for NAICS code 333994:
- Sector 31-33 Directory Hub — List of related industries in the Manufacturing sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- SBA Size Standards Guide — Complete rules and averaging periods for small business classifications.
- Calculating Annual Receipts Guide — Detailed worked example of revenue calculation rules.
- IRS Principal Business Activity Guide — How NAICS codes map to corporate and entity tax filings.
Related Industries in 3339
Frequently Asked Questions (FAQ)
Is 333994 a valid 2022 NAICS code?
NAICS 333994 is 'Industrial Process Furnace and Oven Manufacturing', a 2022 U.S. national industry under Sector 31-33 (Manufacturing); the SBA small-business size standard is 500 employees.
What is the SBA size standard for NAICS 333994?
The SBA small business size standard for NAICS 333994 is 500 employees (based on employees).
What is the legacy SIC code mapping for 333994?
NAICS code 333994 maps to the legacy 1987 SIC codes: 2599 - Furniture and Fixtures, NEC, 3567 - Industrial Process Furnaces and Ovens, 3821 - Laboratory Apparatus and Furniture, 3841 - Surgical and Medical Instruments and Apparatus.