• Four-stage hospital-type filtration. • Effectively cleans small spaces. • Detects air quality and automatically adjusts the fan speed to keep your air purified. • True HEPA filter with antimicrobial treatment safely removes 99.97% of airborne particles as small as 0.3 microns, including allergens, viruses, and cigarette smoke. • Proven to capture the airborne flu virus. • Carbon filter removes odors and captures large airborne particulate. • Certified asthma & allergy friendly™ by the Asthma and Allergy Foundation of America. • Aera+™ Mode for allergy and cold/flu seasons. • Ultra-quiet operation. Replacement filters: HEPA Filter: 5070-746 Carbon Filter: 5070-808