Bypass flow-through style uses a pipe to bring water directly to an electrically controlled valve at the top of the humidifier. Air passes through an aluminum pad (often called a biscuit; the term “biscuit” emphasizes the solid rather than foamy form) which is similar to a piece of extremely coarse. The pad has a coating of 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 pad. Hot air is passed through the pad, causing the water to evaporate from the pad and be carried into the building.
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