Don Vandervort, Head Homeboy, has written more than 30 DIY home improvement books, been a segment host on HGTV, served as MSN.com's home improvement expert and written countless magazine articles.
Evaporative humidifiers, the most popular technology on the market today, capture virtually all minerals and pollutants from even the hardest water, eliminating the white dust that ultrasonic humidifiers can create. They work by passing an air stream through a wet medium such as a sponge or dampened grille.
Some evaporative humidifiers 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. In some cases, filters are treated with a special compound that retards bacterial growth.With tabletop and console models, a quiet fan blows air through the damp surfaces. Some whole-house models use the heating system’s blower to do this job. A filter collects the dissolved solids left behind by the evaporating water; this filter is generally disposable.
Central evaporative humidifiers are made to be attached to the home heating system. They can output up to 25 gallons per day. High-capacity models are fan-powered; other types don’t require a motor. All are hooked up directly to your house’s plumbing, so manual filling isn’t needed.
One newer product, which Emerson offers, has no moving parts, electrical cords, hot water, or even a motor. Ideal for a child’s room, this unit sits directly over a forced-air floor register and can be easily moved from one place to another. It retails for about $20.
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