LibraryQuiet operation. The air purifier unit has LibraryQuiet operation (as quiet as 15 decibels, or the sound of rustling leaves) to blend in with your everyday life and allow for a peaceful night's sleep. Sharp True HEPA filters. Pet allergens and tobacco smoke particles are typically around 1.0 microns. The Sharp True HEPA filters are designed to capture pollutants 1/3 that size - as small as 0.3 microns. The Sharp True HEPA filters are ideal for removing household allergens and effectively reduce pollen, dust, pet dander, and smoke in your home. True HEPA traps 99.97% of microscopic particles from the air that passes through the filter. This not only includes the airborne pollutants that you can see, but also the pollutants that you can't see. Built to be energy-efficient. Sharp True HEPA air purifiers are ENERGY STAR rated and highly efficient, so you can enjoy cleaner and fresher air all day, and all night. Plasmacluster Ion technology with True HEPA filtration. Did you know that the EPA warns that the air inside the average home could be up to 5 times more polluted than the air outside? Sharp air purifiers combine patented Plasmacluster Ion technology with True HEPA filtration, for a cleaner, fresher environment. ARB certified. ARB certified for your protection, Plasmacluster Ion Technology produces almost zero ozone (at less than 0.02 ppm), up to 5X less than the lowest industry and federal safety standards set by the FDA, OSHA, WHO, and NIOSH. Independent-laboratory certified. Sharp air purifiers are tested by independent laboratories to verify the air cleaning capability of the filtration system. Each model has its own CADR rating, which indicates the smoke, dust, and pollen removal rate when the air in the room is changed 5 times per hour. Energy efficient - designed to use less energy than alternative products, potentially helping you save money and reduce your carbon footprint.