- Purification and dust collection equipment (8)
- Air cleaning systems (5)
- Air purification equipment (15)
- Dust or fume collecting equipment, industrial (2)
- Filters, air: furnaces, air conditioning equipment, etc. (17)
- Precipitators, electrostatic (1)
- Blowers and fans (5)
- Exhaust fans: industrial or commercial (4)
- Turbo-blowers, industrial (1)
- Ventilating fans: industrial or commercial (3)
