Establishments primarily engaged in manufacturing industrial and commercial blowers, industrial and commercial exhaust and ventilating fans, and attic fans, or in manufacturing dust collection and other air purification equipment for heating, ventilating and air-conditioning systems or for industrial gas cleaning systems. Establishments primarily engaged in manufacturing air-conditioning units are classified in Industry 3585; those manufacturing free air-circulating fans for use on desks, pedestals, or wall brackets as well as household window-type fans and roll-abouts, and kitchen and household ventilating and exhaust electric fans, except attic, are classified in Industry 3634.

• Air cleaning systems
• Air purification and dust collection equipment
• Aircurtains (blower)
• Attic fans
• Blowers, commercial and industrial
• Dust and fume collecting equipment, industrial
• Exhaust fans, except household and kitchen
• Fans, except household
• Filters, air: for furnaces and air-conditioning equipment
• Furnace blowers (blower filter units)
• Precipitation, electrostatic
• Turbo-blowers, industrial
• Ventilating, blowing, and exhaust fans: except household and kitchen