Unlike lesser models that cannot remove air impurities smaller than 0.3 microns, this air cleaner's patented three-stage HEPA filter captures 99.97% of particles as small as 0.1 micron. It removes allergy-provoking pollen grains, dust mites, mold spores, tobacco smoke, and pet dander particles, resulting in an average Clean Air Delivery Rate (CADR) of 450. 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 365' sq. room five times every hour. The unit does not emit ozone, its filters are easily accessed and replaced, and the three-speed fan is easily operated with the included remote control. The efficient unit uses no more electricity than a 110-watt light bulb. Includes one filter (additional filters sold below). Plugs into AC. 26" H x 20" W x 11" D. (35 lbs.)