Fellowes 9320401 AeraMax 200 Air Purifier for Allergies, Asthma and Flu with True HEPA Filter and 4-Stage Purification Air purifier features True HEPA filter with AeraSafe antimicrobial treatment and carbon filter for four-stage filtration process that captures 99.97% of airborne particles An odor eliminator that also captures mold, dust, germs and smoke-ideal for allergy and asthma sufferers Automatic air purifier performance with AeraSmart Sensor that monitors the air quality and automatically adjusts the fan speed to keep your air purified Certified asthma & allergy friendly by the Asthma and Allergy Foundation of America Recommended for medium sized rooms from 200 to 400 square feet