3564  Industrial & Commercial Fans & Blowers & Air Purification Equipment

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.