Made by Dyson, this is the air purifier that heats or cools a room while eliminating 99.97% of allergens and pollutants from the air. An integrated HEPA filter combines with active graphite crystals to capture particles as microscopic as 0.3 microns—more than 200 times smaller than the diameter of a human hair. Dust, dander, pollen, volatile organic compounds, and other harmful solids and gases are drawn into the tower from all directions. Sensors constantly monitor and respond to pollutants, and the clean air is released in cooling fan mode or as heat set to your desired temperature. The purifier has an anti-tip design and no exposed coils for safety. Filter provides one year of daily use. 24 3/4" H x 6" W x 4 1/2" D. (8 1/2 lbs.)