Combined H13 True HEPA and Carbon Filter plus separate pre-filter filter to capture larger particulate to help extend life of subsequent filters. Pre-filters are washable and can be cleaned as needed. H13 True HEPA Filtration captures up to 99.95% of particles as small as 0.1 microns, including allergens, pollen, dust, pet dander and smoke. Two-year estimated filter life (depending on usage conditions).