AirPura Air Purifier Combines the Air Filtration Efficiency of True HEPA and Activated Carbon Filters with the Extremely High Sterilization Power of Germicidal UV (Ultra Violet) Bulb towards airborne pathogens - Bacteria, Viruses, Microbes and Germs. UV Germicidal lamp sterilizes antigens, pathogens and mold spores as they are trapped on the filters 17 inches germicidal surface U shaped lamp: 2 times the length of other makes and 2 times as effective Activated Carbon and Hepa filters filter airborne chemicals, odors and particles Effective for up to 2000 sq ft 22 high, 15 wide 18lbs Carbon 40 sq ft HEPA filtration surface Headline DWLayoutTable UV Germicidal Lamp in the UV600 DWLayoutTable 20 watt UV lamp 30,000 um per sec squared sterilizes micro-organisms antigens, pathogens and mold spores Lamp situated in filter chamber Kills organisms as they are trapped by the filters. Other UV machines place the UV lamp in the air flow away from the filters. Microbes can escape back into the air. DWLayoutTable right bottom DWLayoutEmptyCell