North American Industry Classification System (NAICS) 2002
31-33 - Manufacturing
This sector comprises establishments primarily engaged in the physical or chemical transformation of materials or substances into new products. These products may be finished, in the sense that they are ready to be used or consumed, or semi-finished, in the sense of becoming a raw material for an establishment to use in further manufacturing. Related activities, such as the assembly of the component parts of manufactured goods; the blending of materials; and the finishing of manufactured products by dyeing, heat-treating, plating and similar operations are also treated as manufacturing activities. Manufacturing establishments are known by a variety of trade designations, such as plants, factories or mills.
Manufacturing establishments may own the materials which they transform or they may transform materials owned by other establishments. Manufacturing may take place in factories or in workers' homes, using either machinery or hand tools.
Certain activities involving the transformation of goods are classified in other sectors. Some examples are post-harvest activities of agricultural establishments, such as crop drying; logging; the beneficiating of mineral ores; the production of structures by construction establishments; and various activities conducted by retailers, such as meat cutting and the assembly of products such as bicycles and computers.
333 - Machinery Manufacturing
This subsector comprises establishments primarily engaged in manufacturing industrial and commercial machinery. These establishments assemble parts into components, subassemblies and complete machines. They may make the parts themselves, using general metal-working processes, or purchase them.
Establishments tend to specialize in producing machinery designed for particular applications, and this is reflected in the structure of the industry groups and industries. A broad distinction exists between general-purpose machinery, that is designed to be used in a variety of industrial applications, such as pumping or machining, and special-purpose machinery, that is designed to be used in a particular industry, such as agriculture or printing. The first three industry groups consist of establishments that produce special-purpose machinery. Establishments that produce general-purpose machinery are classified in the remaining industry groups.
Establishments primarily engaged in rebuilding machinery are included in the same industry as establishments manufacturing the particular type of new machinery. Unless otherwise specified, establishments primarily engaged in manufacturing parts, designed for use solely or principally with a particular machine, are classified in the same industry as establishments manufacturing that type of machinery.
3334 - Ventilation, Heating, Air-Conditioning and Commercial Refrigeration Equipment Manufacturing
This industry group comprises establishments primarily engaged in manufacturing ventilation, heating, air-conditioning and commercial refrigeration equipment.
33341 - Ventilation, Heating, Air-Conditioning and Commercial Refrigeration Equipment Manufacturing
This industry comprises establishments primarily engaged in manufacturing ventilation, heating, air-conditioning and commercial refrigeration equipment.
Exclusion(s):
Establishments primarily engaged in:
- manufacturing industrial, power and marine boilers (See 33241 Power Boiler and Heat Exchanger Manufacturing)
- manufacturing commercial cooking and food warming equipment (See 33331 Commercial and Service Industry Machinery Manufacturing)
- manufacturing industrial process furnaces and ovens (See 33399 All Other General-Purpose Machinery Manufacturing)
- manufacturing household fans (except attic), and portable electric space heaters, humidifiers and dehumidifiers (See 33521 Small Electrical Appliance Manufacturing)
- manufacturing household cooking stoves, ranges, refrigerators and freezers (See 33522 Major Appliance Manufacturing)
- manufacturing motor vehicle air-conditioning systems and compressors (See 33639 Other Motor Vehicle Parts Manufacturing)
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