The Powermatic Cyclone is the only Cyclonic Dust Collector on the market with an Auto-Cleaning HEPA filter. The included HEPA filter traps 99.9% of all particles at 0.3 micron. A clean filter is essential for the performance and life of your AFS air filtration system. Replace when clogged or dirty. Always trust genuine JET parts for your JET Tools. They are guaranteed to fit and work perfectly in your equipment.