Enerzen by OION Technologies LB-444 Commercial HEPA Air Purifier 3500 Sq. Ft. Ozone Ionizer Cleaner Clean Air Commercial Grade Air Purification with 6 Stages of Purification - Permanent HEPA, UV, Ionization, Ozone, Carbon filtration, and PCO filtration to keep you and your family breathing clean air for years to come. Powerful Air Purification in a Compact and Stylish Furniture Grade Wood Cabinet - Cleans the air you breathe in style. Electrostatic Ionizer Purification - Negative ions (O1) remove airborne pollutants as small as .01 micron such as allergens, pollen, mold, smoke, pet dander, unpleasant odors, dust, and other airborne irritants. Carbon Filtration and Ozone Power (O3) &lt; 0.05 ppm - Reduces odors, freshens the air, and absorbs volatile airborne pollutants. UVGI technology - Kills germs, viruses, bacteria, and other microorganisms that cause disease.