"The North American Industry Classification System or NAICS is used by business and government to classify business establishments according to type of economic activity in Canada, Mexico, and the United States of America." It has largely replaced the older Standard Industrial Classification system (SIC); however, certain government departments and agencies, such as the U.S. Securities and Exchange Commission, still use the SIC codes. [More Information]
The NAICS Industry Code or Title of 238220 covers: plumbing, heating, and air-conditioning contractors.
The NAICS Industry Code or Title of 33341 covers: ventilation, heating, air-conditioning, and commercial refrigeration equipment manufacturing.
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