Effectively purifies air in a large rooms 300-600 square feet with a 4-stage hospital-type filtration. AeraSmart™ Sensor monitors the air quality and automatically adjusts the fan speed to keep your air purified. True HEPA filter with AeraSafe™ antimicrobial treatment safely removes 99.97% of airborne particles as small as 0.3 microns, including pollen, ragweed and other allergens, viruses, germs, dust mites, mold spores, pet dander and cigarette smoke. Extremely effective at capaturing influenza virus from indoor air ( based on independent tes