Tower Air Purifier from the #1 Doctor Preferred Brand. True HEPA filtration captures 99.97% of particles as small as 0.3 microns. Removes airborne allergens such as dust, pet dander, pollen, tobacco smoke, fabric fibers and mold spores from rooms up to 200 square feet. LCD electronic control features an Auto Mode which automatically sets fan speed to one of three speeds based on air quality. VOC-SENSE detects volatile organic compounds, gases and fumes. A charcoal pre-filter reduces VOCs, traps odors and pre-cleans the air before it reaches the HEPA filter. Sleep Mode and up to 18-hour countdown timer. AHAM Certified CADR (Clean Air Delivery Rate). ENERGY STAR® Qualified.