The Shark Air Purifier MAX uses Pure Air Microforce to deliver fast, powerful, and quiet purification. Clean Sense IQ senses air quality & auto-adjusts to improve air quality 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 1200 square feet. "Allergens" refers to non-living matter.