AeraMax SV Combo Filter, 2 Sets/PackCombined 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). Package Includes: (2) Hybrid + Carbon Combo