Sold as 1 Each. 99.99% effective against *. PureView screen shows real time air quality data, the percentage of particles captured and a live status of room air quality. Compatible with Hybrid Filter 9436902. Compatible with 3/4' Pre-Filter 9600501. Includes wall plug. The only air purifier that automatically responds to occupancy and air quality levels and then shows you when the air is clean. 4-stage True HEPA filtration system removes over 99% of all airborne contaminants. Compatible with Hepa Filter 9416602. Compatible with Carbon Filter 9416502. Delivers 3-5 air changes per hour (ACH) in 650-1100 square feet shared spaces such as classrooms and conference rooms. Quiet operation. Antimicrobial HEPA treatment prevents bacteria growth on the filter and activated carbon filter reduces odors and VOCs. Compatible with Carbon Filter 9416502. Compatible with Carbon Filter 9436802. Patented EnviroSmart technology continuously monitors and automatically adjusts performance based on air