3 in 1 True HEPA filtration removes up to 99.97% of airborne allergens as small as .9 microns Activated carbon filter reduces odors and VOC's. Pre-filter captures large particles. 3 speeds, quite operation CADR: 76 Pollen, 68 Dust, 60 Smoke CFM Cleans the air in a 92 sq. ft. room every 12.5 minutes or in a 447 sq. ft. room once every hour Great for bedrooms and home offices. Replace filter indicator. Essential oil tray with 3 pads.