- Purification and dust collection equipment (4)
- Air cleaning systems (7)
- Air purification equipment (11)
- Dust or fume collecting equipment, industrial (4)
- Filters, air: furnaces, air conditioning equipment, etc. (8)
- Blowers and fans (5)
- Blowing fans: industrial or commercial (3)
- Exhaust fans: industrial or commercial (1)
- Ventilating fans: industrial or commercial (2)
