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Evaporative pads are porous pads that are mounted on the sidewall of a building, wet with water, either by running water down it from the top or by spraying water on it with nozzles, and then air is drawn through the pad. This process, called evaporative cooling, uses heat in the air to evaporate water, thereby reducing the air temperature but increasing the humidity.
Livestock Industry Facilities and Environment
Iowa State University Extension and Outreach
Agricultural and Biosystems Engineering
Agricultural Education | Bioresource and Agricultural Engineering
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Harmon, Jay D., "Livestock Industry Facilities and Environment: Swine Cooling Methods—Evaporative Pads" (1997). Agriculture and Environment Extension Publications. 169.