Effectively purifies air in a 190 sq ft room; AeraSmart(TM) sensor monitors the air quality & automatically adjusts the fan speed to keep air purified; True HEPA filter with AeraSafe(TM) antimicrobial treatment safely removes 99.97% of airborne particles as small as .3 microns, including pollen, ragweed & other allergens, viruses, germs, dust mites, mold spores & cigarette smoke; Aera+(TM) mode for allergy & cold/flu seasons ; Ultraquiet operation;