DESC: The LakeAir Excel Air Purifier is perfect for a 15x15 foot room. This Air Purifier provides moderate coverage and a powerful electronic filtering system with an activated carbon filter and a two-speed fan.Put it on your desk, place it on the floor. You can keep your work area clean and sterile with the LakeAir Excel Air Purifier.The LakeAir Excel Air Purifier has a 15x 15 foot coverage area and acts to eliminate particles, gas and odor. The filter compound is an activated carbon filter and the Excel has 4 air changes per hour. With a CFM (cubic feet per minute) rate of 70-110, the LakeAir Excel Air Purifier is a desktop model. The LakeAir Excel Air Purifier features quiet operation, a two-speed fan and a carbon afterfilter to remove odors. The electronic filter cell is 97% efficient on extremely small particulate.