The Philips FY5185 / 30 HEPA filter is suitable for the Philips AC5659 / 10 air purifier. With a HEPA filter you can remove up to 99.97% of all allergens in the air. Whirling dust particles and unpleasant odors do not stand a chance. On average, the filter lasts up to 24 months. Of course that has to do with the use of the air cleaner.