This U.S. industry comprises establishments primarily engaged in (1) manufacturing air-conditioning (except motor vehicle) and warm air furnace equipment and/or (2) manufacturing commercial and industrial refrigeration and freezer equipment. Manufacturing motor vehicle air-conditioning systems and compressors--are classified in U.S. Industry 336391, Motor Vehicle Air-Conditioning Manufacturing; Manufacturing household-type refrigerators and freezers--are classified in U.S. Industry 335222, Household Refrigerator and Home Freezer Manufacturing; Manufacturing portable electric space heaters, humidifiers, and dehumidifiers--are classified in U.S. Industry 335211, Electric Housewares and Household Fan Manufacturing; Manufacturing heating boilers, heating stoves, floor and wall mount furnaces, and electric wall and baseboard heating units--are classified in U.S. Industry 333414, Heating Equipment (except Warm Air Furnaces) Manufacturing; and Manufacturing furnace air filters--are classified in U.S. Industry 333411, Air Purification Equipment Manufacturing.
