This HEPA filter helps remove up to 99.97% of air particles as small as 0.3 microns such as dust, pollen, pet dander and more from air passing through the filter. Pollutants are eliminated and replaced with breaths of nourishing air. The renewing effects of cleaner air become more present in your surroundings. With Holmes® brand technology, you can live in harmony with nature for a serene home-environment.