The Fellowes aeramax DX95 air purifier effectively purifies air in large rooms from 300 sq. Ft. To 600 sq. Ft. With 4-stage hospital-type filtration! The aerasmart sensor monitors the air quality and automatically adjusts the fan speed to keep your air purified. The true HEPA filter with aerasafe antimicrobial treatment safely removes 99.97% of airborne particles as small as .3 microns, including pollen, ragweed and other allergens, viruses, germs, dust mites, mold spores, pet dander, and cigarette smoke. Its extremely effective at capturing Influenza virus from indoor air (based on independent testing). The carbon filter removes odors and captures large airborne particulates. The aera mode is ideal for allergy and cold/flu seasons. It boasts Ultra quiet operation and the fan speed indicator lets you manually adjust the fan speed setting - Low, medium, or high. The filter change indicators let you know when it is time to replace your carbon or true HEPA filter. It has a built-in handle for easy portability and a user-friendly capacitive touch display panel effectively communicates machine performance.