The WhisperJet's U15 ULPA exhaust filters are made in France to the highest industry standards. This advanced filtration system captures particles almost 3X smaller than HEPA filters. The WhisperJet's ULPA filtration will allow you to achieve unprecedented air filtration performance unlike any other residential vacuum cleaner on the market. Filtration Rating: U15 ULPA - Captures 99.9997% of particles down to 0.12 microns in diameter. Fits Soniclean WhisperJet C2 Canister Vacuum Cleaners. Includes (1) ULPA Exhaust Filter Style: C2 Made in France *Soniclean recommends replacing this filter every 6 months for optimal suction performance.