A combination of Hunter's EcoSilver pre filter, True HEPA, Photocatalyst filters cleans the air of smells, harmful VOCs, smoke, dust, pollen, and more UVC technology inhibits the growth of bacteria and viruses that are exposed to the UVC ight High, medium, and low fan speeds so you get the cleaning power you want when you want it. Also includes a sleep mode for quiet operation and 2, 4, and 8-hour timed modes. Filter replacement indicator to remind you when it is time to change the filters. Recommend changing pre-filter every 3 months and True HEPA every 6 months.