The PuRXium Freestanding Air Purifier offers 4-stage, 4-sided intake at 360 degrees to give a large room clean and odor free air. It comes complete with 4 metal pre-filters, 4 H13 high-grade HEPA filters, 4 active carbon filters and UV-C light that work together to capture up to 99.9% of various airborne particles 0.1 Micron or larger, including bacteria and various contaminants to provide fresher, cleaner air. The air purifier cycles air within a room up to 1000* sq. ft. 2x every hour and 500 sq. ft. 4x every hour. Relax and breathe easy with this peace-of-mind essential for today's home. NOTE: *Approximately 1,000-square-foot area. 4-STAGE 360 DEGREE AIR INTAKE H13 HIGH-GRADE HEPA FILTRATION SYSTEM HIGH-GRADE HEPA FILTERS (4) – H13 high-grade HEPA filters capture 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 ACTIVE CARBON FILTERS (4) – Captures up to 99.9% of unwanted particles including cooking odors, smoke and VOCs 0.1 Micron or larger REMOVABLE, REUSABLE METAL PRE-FILTERS (4) – Captures larger airborne particles such as dust and pet dander CLEANING AND MAINTENANCE To get the most out of your Purxium™ Air Purifier, it’s best to clean the washable pre-filters once a month or more often, depending on where the air purifier is placed and if you have pets. The HEPA H13 filters should be cleaned once a month using the brush attachment from a vacuum. Your air purifier will automatically tell you when it’s time to change your filter when 2,500 hours of purification has been reached. The filter replacement light will illuminate in red when it is time to replace the HEPA H13 and active carbon filters on the unit. When needed, replacement filters can be purchased directly from Cuisinart.