Delivers 3-5 air changes per hour (ACH) in 300-550 square feet shared spaces such as waiting rooms and restrooms. Quiet operationPatented EnviroSmart technology continuously monitors occupancy and room air quality and automatically adjusts to clean the air4-stage True HEPA filtration system removes 99.97% of all airborne contaminants, including virusesAntimicrobial HEPA treatment prevents bacteria growth on the filter and activated carbon filter reduces odors and VOCsCommercial grade wall mount air purifier with 5-year limited warranty