- Purification and dust collection equipment (5)
- Air cleaning systems (9)
- Air purification equipment (17)
- Dust or fume collecting equipment, industrial (3)
- Filters, air: furnaces, air conditioning equipment, etc. (14)
- Precipitators, electrostatic (1)
- Blowers and fans (2)
- Aircurtains (blower) (1)
- Ventilating fans: industrial or commercial (1)
