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 2. 3 fan speeds. Covers 150 - 250 square feet. 14.19x4.13x22.63. 3-year warranty. Stainless Steel.