The only air purifier that automatically responds to occupancy and air quality levels and then shows you when the air is clean Delivers 3-5 air changes per hour (ACH) in 300-550 square feet shared spaces such as waiting rooms and restrooms. Quiet operation Patented EnviroSmart™ technology continuously monitors and automatically adjusts performance based on air quality and occupancy PureView screen shows real time air quality data, the percentage of particles captured and a live status of room air quality 4-stage True HEPA filtration system removes 99.97% of all airborne contaminants, including viruses Antimicrobial HEPA treatment prevents bacteria growth on the filter and activated carbon filter reduces odors and VOCs Commercial grade floor stand air purifier with 5-year limited warranty