The Sharp Plasmacluster Ion Air Purifier with True HEPA Filtration effectively reduces pollen dust pet dander smoke germs bacteria viruses odors mold and fungus in your living space up to 280 square feet. It has a three-stage filter system including a back panel micro-mesh pre-filter deodorizing non-washable active carbon filter and long-life True HEPA filter which captures 99.97% of particles as small as 0.3 microns from the air that passes through it. Patented Plasmacluster Ion Technology disperses positively and negatively charged ions throughout the room to safely break down microorganisms and odors (even those trapped in fabric carpeting and drapery!). This is the ideal solution for allergy sufferers asthmatics pet owners and smokers and is best used in a bedroom living room study or exercise room. The unit has LibraryQuiet operation and is ENERGY STAR rated so you can run the unit continuously while saving money and energy.