The Hammacher Schlemmer Institute commissioned an independent laboratory to test the most advanced air cleaners, and this one proved to be The Best because it has an average Clean Air Delivery Rate (CADR) of 445.6--16% higher than the closest competitor. Unlike other models that cannot remove air impurities smaller than 0.3 microns, The Best Air Cleaner's three HEPASilent filters capture 99.97% of 0.1 micron particles, including allergy-provoking pollen grains, dust mites, mold spores, tobacco smoke, and pet dander particles. Filtered air is discharged diffusely from vents that are six times larger than the average air cleaner's, resulting in no noticeable draft. Despite its quiet operation, the device is powerful enough to recycle air in a 680' sq. room six times every hour. The filters are easily accessed and replaced through the top panel, the three-speed fan is controlled with a turn of a dial, the casters allow ease of maneuverability. Includes one set of filters (additional filters sold below). Plugs into AC. 26" H x 20" W x 13" D. (35 lbs.)