Air purifier features a three-stage filtration system that includes a pre-filter, HEPA filter and carbon filter to reduce odors and provide cleaner air. Three fan speed settings allow you to control the circulation of air in the room to accommodate your personal preference. Adjustable timer settings can be set to operate for two hours, four hours or eight hours to let you select how long you want the air purifier to operate until it automatically shuts off. Quiet operation prevents emitting distracting levels of sound for convenient use in nearly any setting. Air purifier is designed for rooms up to 270 square feet.