For large rooms up to 500 square feet, this air purifier features electronic controls and 4 fan speeds, including Turbo Setting to clear the air quickly, and Sleep Mode for quiet operation while saving energy. The True HEPA filter captures 99.97% of particles as small as 0.3 microns. A charcoal pre-filter traps odors and pre-cleans the air before it reaches the HEPA filter. Removes airborne allergens such as dust, pet dander, pollen, tobacco smoke, fabric fibers and mold spores. The Quiet Partner System offers the quietest high efficiency air purifier technology.