221330 — Steam and Air-Conditioning Supply
Description
This industry comprises establishments primarily engaged in providing steam, heated air, or cooled air. The steam distribution may be through mains (as defined in the official U.S. Census Bureau 2022 NAICS Manual).
Overview Facts
Legacy SIC Concordance
Trace the historical mapping chain from the 1987 Standard Industrial Classification (SIC) to the modern 2022 NAICS code format.
- SIC 4961 - Steam and Air-Conditioning Supply (via SIC1987:4961→NAICS1997:22133→2002:221330→2007:221330→2012:221330→2017:221330→2022:221330)
Suggested Product Service Codes (Advisory)
The following Product Service Codes (PSCs) are advisory suggestions aligned with this NAICS code. Note: NAICS and PSC codes map to different dimensions of procurement (industry vs. product/service). There is no official binding 1:1 crosswalk.
- PSC 4420 — Heat Exchangers and Steam Condensers
Source: DoD DPCAP PSC Selection Tool (Ingested: 2026-06-29)
Frequently Asked Questions (FAQ)
Is NAICS code 221330 valid in 2022? ▾
Yes, 221330 is a valid 6-digit 2022 NAICS national industry code representing 'Steam and Air-Conditioning Supply' under Sector 22 in the official classification index.
What is the SBA size standard for NAICS code 221330? ▾
The Small Business Administration (SBA) has established a small business size standard of $30,000,000 for NAICS code 221330 (Steam and Air-Conditioning Supply), calculated based on receipts.
What is the legacy SIC equivalent for NAICS 221330? ▾
According to official Census Bureau concordance tables, NAICS code 221330 (Steam and Air-Conditioning Supply) maps to legacy 1987 Standard Industrial Classification (SIC) codes: 4961 - Steam and Air-Conditioning Supply.
Related Pages & Tools
Further regulatory reference links for NAICS code 221330:
- Sector 22 Directory Hub — List of related industries in the Utilities sector.
- SIC ↔ NAICS Crosswalk Tool — Look up mappings between legacy SIC codes and modern classifications.
- NAICS 221330 to SIC Crosswalk — Bidirectional mapping to legacy SIC codes (Steam and Air-Conditioning Supply).
- 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.