Honeywell 50100 Enviracaire Air Purifier 100 CADR (Clean Air Delivery Rate) for small to medium rooms (11 ft x 14 ft). True HEPA Filter is 99.97% effective at reducing airborne particles from the air passing through it, such as pollen, cat dander, household dust, mold spores and tobacco smoke. Activated Carbon Pre-filter helps reduce odors and extends HEPA filter life. Multiple Air Cleaning power levels Patented 360 degree Air Intake adn Discharge for effective air cleaning power.