: Also cleans rooms up to 1,110 sq ft in 1 hour (555 sq ft in 30 minutes, 370 sq ft in 20 minutes, 278 sq ft in 15 minutes) : Captures 99.97%* of airborne allergens including pollen, dust, smoke, and pet dander, as small as 0.03 microns -: The first line of defense against the largest airborne particles found indoors : Reduces VOCs and household odors from cooking, pets, and smoke. It is designed to catch airborne particles found indoors, which also helps prolong the True HEPA Filter life + : Built-in air quality sensor measures and adjusts fan speed in real-time -: Nearly silent on slowest speed :Unit automatically activates its quiet, energy-efficient Sleep Mode when room is darkened and returns to Auto Mode in the presence of light