This U.S. industry comprises establishments primarily engaged in manufacturing attic fans and industrial and commercial fans and blowers, such as commercial exhaust fans and commercial ventilating fans.

Cross-References. Establishments primarily engaged in--

• Manufacturing air-conditioning units (except motor vehicle)--are classified in U.S. Industry 333415, Air-Conditioning and Warm Air Heating Equipment and Commercial and Industrial Refrigeration Equipment Manufacturing;
• Manufacturing motor vehicle air-conditioning systems and compressors--are classified in U.S. Industry 336391, Motor Vehicle Air-Conditioning Manufacturing;
• Manufacturing household-type fans (except attic) and portable air purification equipment--are classified in U.S. Industry 335211, Electric Housewares and Household Fan Manufacturing; and
• Manufacturing stationary air purification equipment--are classified in U.S. Industry 333411, Air Purification Equipment Manufact uring.