The Venta-Sonic VS 100 features new Nano-Silver technology that provides microbial protection. In addition to the Nano-Silver material that helps prevent bacterial growth, the filter housing also contains material to prevent calcium and lime build-up. The Venta-Sonic VS 100 ultrasonic humidifier provides efficient humidification through high-frequency vibration generating micro-fine mist, either warm or cool, as you choose. A fan blows the mist visibly into the room where it instantly evaporates.