Honeywell Evaporative Air Coolers are constructed with three central components:
a pump system to circulate water and
a honeycomb-shaped absorbent panel.
The fan draws in warm air through the wet honeycomb media; evaporation converts the moisture into water vapor; and then cooler, more humid air flows out on the other side. When using an evaporative air cooler, ventilate. Open a window, or keep a door ajar, to expel over-humidity and allow for circulation of fresh, dry air. Also, be aware that the honeycomb media may have a distinct odor when first used, which will dissipate after a couple hours.