Winix WAC5500 True HEPA Air Cleaner with PlasmaWave Technology Long life true HEPA filtration captures 99.97% of airborne pollutants and allergens as small as 0.3 microns Odor control Carbon pre-filter especially formulated to capture offensive smoke, cooking and other household odors. Plasmawave technology attacks pollutants at a molecular level to neutralize viruses, bacteria, chemical vapors, and odors - without producing harmful ozone. Smart sensor with auto-mode automatically adjusts your air cleaner settings to meet the needs of your environment. Energy star qualified to save you money.