Festool 498994 Replacement Hepa Filter Element for Ct 26/36/48, White 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 Compliant with EPA RRP guidelines Replacement filter for original equipment on CT 26/36/48