Four stage True HEPA filtration removes at least 99.97% of particles as small as 0.3 microns including allergens, pollen, dust, pet dander and smoke. Antimicrobial HEPA treatment applied to the True HEPA filter inhibts the growth of odour and stain-causing microorganisms. Monitor occupancy and air quality using EnviroSmart™ Technology. EnviroSmart™ Technology continuously monitors your environment and automatically adjust to clear the air. AM 4 PC. EnviroSmart™ Technology continuously monitors your environment and automatically adjust to clear the air. PureView™ Technology show the percentage of particles captured and a live status of room air quality. 5 fan speeds. Covers 650 - 1,100 square feet. 37x9.5x19.5. 5-year warranty. Stainless Steel.