Master Coolers cool the air using a simple natural process: the evaporating water decreases the temperature of the air. A pump takes the water from a tank and wets a wide filter of natural cellulose. A powerful ventilator aspires air through the filter. The water evaporates from the filter and decreases the temperature of the air of several degrees. The fresh and clean air flows into the ambient, and cools it.
The design and operation of evaporative coolers help prevent the growth and transmission of Legionnaires’ disease according to the magazine of the American Society of Heating, Refrigerating and Air-conditioning Engineers (ASHRAE).