Bypass flow-through power humidifier
Bypass flow-through style (bypass – uses a pipe to bring water directly to an electrically controlled valve at the top of the humidifier. Air passes through an aluminum “biscuit” (often called a pad or water panel; the term “biscuit” emphasizes the solid rather than foamy form) which is similar to a piece of extremely coarse steel wool. The biscuit has a coating of a matte ceramic, resulting in an extremely large surface area within a small space. When the humidistat calls for humidity, the valve is opened and causes a spray of water onto the biscuit. Hot air is passed through the biscuit, causing the water to evaporate from the pad and be carried into the building.
Advantages include:
- Reduced maintenance (new biscuit is needed only when clogged with dust or mineral deposits, typically once per year)
- Lack of a pan of potentially stagnant water to serve as a breeding ground for mold as with a drum-style humidifier
- No incidental humidification caused by a constantly replenished pan of water in a high velocity air stream
- Reduced requirement for expensive air filters
- Uses little electricity
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