Blueair 501 Air Purification System Air purification system for rooms up to 620 square feet Sleek, contemporary, Swedish design; steel housing; easy to use and maintain 2-stage HEPASilent technology captures 99.97-percent of 0.1 micron particles Ultra-quiet operation; energy efficient, pleasant SurroundAir system Measures 26 by 20 by 13 inches; 10-year warranty