The CAP-500 Air Purifier comes complete with dual filtration using two H13 high-grade HEPA filters, active carbon filters and removable, reusable metal pre-filters. Our three-stage filter system captures up to 99.9% of airborne particles 0.1 Micron or larger including bacteria and various contaminants as well as dust, pollen and odors from cooking, smoke, pets and VOC’s. The air purifier cycles air within 500 sq. ft. room 2x every hour and 250 sq. ft. 4x every hour. Relax and breathe easy with this peace-of-mind essential for today's home. 3-STAGE DUAL AIR INTAKE H13 HIGH GRADE HEPA FILTRATION SYSTEM HEPA H13 – H13 high-grade HEPA filters capture up to 99.9% of airborne particles 0.1 Micron or larger including bacteria and various contaminants ACTIVE CARBON FILTERS – Captures up to 99.9% of various unwanted cooking odors, smoke and VOCs to 0.1 Micron or larger REMOVABLE, REUSABLE METAL PRE-FILTERS – Captures larger airborne particles such as dust, pet dander and cooking oils CLEANING AND MAINTENANCE Your air purifier will automatically tell you when it’s time to replace the dual action HEPA H13 and active carbon filters on the unit. The filter replacement light will illuminate in red after 2,500 hours of continuous use. When needed, replacement filters can be purchased directly from Cuisinart. The H13 high-grade HEPA filters should be vacuumed once a month for the air purifier to perform at its best. If the air purifier contains dust or pet dander, it’s best to clean the removable metal pre-filters more often than once a month to maintain 2,500 hours of filter life. The metal pre-filters are to be hand-washed only. If the filters are fairly clean, wash each filter with soapy, warm water. If the pre-filters are very dirty, you may need use a soft brush to gently clean them.