1. 3M Company
2. AAir Purification Systems
3. Air Purification Inc.
4. Alfa Chemistry
5. American Air Filter International by Daikin Industries
Ltd.
6. Camfil AB
7. Cobetter Filtration Equipment Co.Ltd
8. D&D Filtration
9. Donaldson Company Inc.
10. Entegris Inc.
11. Evoqua Water Technologies LLC
12. Fil-Trek
13. Filtersource.com Inc.
14. Filtration Group Corporation
15. Freudenberg Filtration Technologies GmbH & Co. KG
16. Graver Technologies
17. Koch Filter
18. Lenzing AG
19. MANN+HUMMEL International GmbH & Co. KG
20. Mott Corporation
21. Pall Corporation
22. Parker Hannifin Corporation
23. Porvair Filtration Group Ltd.
24. Valin Corporation
25. W. L. Gore & Associates Inc.