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 and cigarette smoke. Ultra quiet operation. Filter Change Indicators let you know when it is time to replace your Carbon or True HEPA filter AM II. Cleans the air in smaller spaces such as restrooms, exam rooms and small offices. Works in spaces 150-300 square feet. The  patented EnviroSmart technology detects the environment and automatically adjusts performance for cleaner air all the time. The Slim fits compactly in small areas-only 4" from wall. Wall mountable, recessed wall mountable and floor stand mountable options are available. Comes with a 3 Year Limited Warranty. 5 Year Limited Warranty.