The AeraMax(R) 100 air purifier features a 4-stage hospital-type filtration that effectively cleans air in small spaces 100-200 square feet. The Smart Sensor detects air quality and automatically adjusts the fan speed to keep your air purified. A True HEPA filter with antimicrobial treatment safely removes 99.97% of airborne particles and the carbon filter removes odors. The air purifier also includes the Aera+(TM) Mode for allergy and cold/flu seasons and features ultra-quiet operation.