The Shark Air Purifier 3-in-1 uses Pure Air MicroForce to deliver fast, powerful, and quiet purification with added purified heat and purified fan modes. Clean Sense IQ senses air quality & auto-adjusts to improve and report results in real time. A HEPA filter captures 99.98% of airborne particles like allergens*, dust, and dander (based on IEST-RP-CC007.3, 0.1-0.2 microns). Cleans up to 500 square feet. *Allergens refers to non-living matter.