Festool 493334 HEPA Filter Element For CT 22 And CT 33, 2 Pieces HEPA Main Filter captures 99.99% of particulate matter down to .3 microns, helping you work cleaner and breathe easier Traps the smallest of particles while maintaining airflow, allowing you to reach full capacity without clogging or caking HEPA filters are the new standard for wood dust collection, both in the workshop and on the jobsite Includes 2 HEPA Filter Elements for the CT 22 and CT 33 Made in Germany.