The AC-2102 features a Four-Stage filter assembly: Activated Carbon filter， HEPA filter， VOC filter and TiO2 filter with UV Light . Targeted to effectively remove smoke， dust， pollen， PM2.5， bacteria， mold and virus in a 1，000 cu.ft. space. Both HEPA and VOC filters are designed to operate continuously for up to 2，000 hours. Common airborne diseases caused by viruses or bacteria: the common cold， influenza or flu， COVID-19， mumps， chickenpox， measles， whooping cough or pertussis， tuberculosis or TB， diphtheria， etc. Improving indoor air quality and ventilation can reduce the exposure to and transmission of airborne diseases. An air purifier can play a key role to improve air ventilation*.*The air purifier cannot offer complete protection on its own. Other prevention of airborne transmission of infections includes vaccinations， wearing personalized protective equipment (like masks)， and performing basic infection prevention measures (like hand washing). The tests did not measure whether the air purifier was able to prevent transmission of the virus or bacteria from person to person.