There are many different ways to raise the humidity in your home. You can put a pan of water on the stove or on the radiator, or you hang wet towels near a heater duct. However, most people use mechanical humidifiers like Steam Vaporizers, Impellers, Ultrasonic Wicks or Evaporative Systems to do the job.
Evaporative humidifiers are the most common type. This usually deploys a paper, cloth or foam wick or sheet to draw water out of the reservoir. A fan blowing over the wick lets the air absorb moisture. The higher the relative humidity, the harder it is to evaporate water from the filter, which is why this type of humidifier is self-regulating. As humidity increases, the humidifier's water-vapor output naturally decreases.
Its simplicity and self-regulating ability makes this a useful humidifier. Evaporative humidifiers, the most popular technology today, capture virtually all minerals and pollutants from even the hardest water, eliminating the white dust that ultrasonic humidifiers can create. The technique works effectively both with tabletop and console models as well as with central evaporative humidifiers attached to the home heating system.
They work by passing an air stream through a wet medium, such as a sponge or dampened grill. Some have fiber honeycomb-type panels that wick water upward from a reservoir others employ a foam or cloth drum that spins through a water-filled trough as air passes by. Still others blow air through a woven aluminum pad that is saturated by a constant stream of water.
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