Humidify dry air without the fear of releasing bacteria. This Dyson fan is the most hygienic humidifier with even room coverage. Before releasing any mist, Ultraviolet Cleanse technology uses a three minute cycle to kill 99.9% of bacteria in the water tank. Every drop of water is exposed to an ultraviolet light which ensures that any mist projected is always 99.9% bacteria free. Plus it uses Air Multiplier™ technology to project hygienic, humidified air quickly and quietly. It disperses mist evenly throughout the room.