Automatically responds to occupancy and air quaility levels and shows you when the air is clean. Delivers three to five air changes per hour in 650-1100 square feet shared spaces such as classrooms and conference rooms. Quiet operation. Patented EnviroSmart™ technology continuously monitors and automatically adjusts performance based on air quaility and occupancy. PureView screen shows reqal time air quality data, the percentage of particles captured, and a live status of room air quality. Antimicrobial HEPA treatment prevents bacteria growth on the filter and activated carbon filter reduces odors and VOCs. Commercial grade.