- Purification and dust collection equipment (4)
- Air cleaning systems (9)
- Air purification equipment (13)
- Dust or fume collecting equipment, industrial (5)
- Filters, air: furnaces, air conditioning equipment, etc. (5)
- Blowers and fans (5)
- Blowing fans: industrial or commercial (2)
- Exhaust fans: industrial or commercial (1)
- Ventilating fans: industrial or commercial (2)
