The Ultra3 Ultrasonic Vortex Humidifier is a uniquely effective way to create a comfortable, perfectly humidified living space. Vornado's deep pitch blades pull large volumes of harsh, dry air through the unit, and then, using Vornado's signature Vortex Action, circulates the humidified air throughout the room, providing complete and uniform humidification in spaces up to 600 square feet.