Combined H13 True HEPA & Carbon Filter plus separate pre-filter filter to capture larger particulate to help extend life of subsequent filters. Pre-filters are washable & 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 & smoke. Two-year estimated filter life (depending on usage conditions). Air Purifier Filter Type: True HEPA / Carbon; Air Cleaner Compatibility: AeraMax SV; Width: 2.3; Depth: 11.5.