Three functions: combined in one filter – H13 True HEPA & Carbon filter plus separate pre-filter filter to capture larger particulate to help extend life of subsequent filters. Reusable 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. Long-lasting performance up to two-years (depending on usage conditions). Filter Type: Pre-Filter, H13 True HEPA, Carbon Filter; Filtration For: Allergens; Dust; Pet Dander; Pollen; Smoke; Air Cleaner Compatibility: Fellowes AeraMax SE; Width: 10.87".