HOLMES HAP240 Air Purifier Quietly cleans air in a 10x11 foot room every 10 minutes Utilized a HEPA/4 filter to effectively eliminate microscopic antagonists from the air (pollen, smoke, bacteria) with long-life efficiency (3 to 6 months average) Unobstructed air delivery Two micro-balanced centrifugal blow fans deliver 100 cubic feet per minute of air An activated charcoal filter deodorizes air to remove unpleasant odors and harmful gases