Plasma Cluster KC-B50-W Operation confirmed. There are no damages or malfunctions, but there are scratches and dirt. Please replace the filters if you are concerned. Humidifying/Air Purifying: Up to 14 tatami mats Air Purifying: Up to 23 tatami mats Although cleaned, please understand that this is a used item before purchasing. There is no original box, so it will be shipped in a separate box.