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| Primary NAICS Code | Primary Industry | Working Business Activity |
| 423730 | Warm Air Heating and Air-Conditioning Equipment and Supplies Merchant Wholesalers |
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| NAICS Code 2 | Industry 2 | Working Business Activity |
| 425120 | Wholesale Trade Agents and Brokers |
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| NAICS Code 3 | Industry 3 | Working Business Activity |
| 54162 | Environmental Consulting Services |
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| NAICS Code 4 | Industry 4 | Working Business Activity |
| 811310 | Commercial and Industrial Machinery and Equipment (except Automotive and Electronic) Repair and Maintenance |
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| NAICS Code 5 | Industry 5 | Working Business Activity |
| 238220 | Plumbing, Heating, and Air-Conditioning Contractors |
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| Additional NAICS Codes |
| Sale of air pollution control equipment and replacement parts |
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