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The cooling effect is from evaporation mainly. The fan moves an increased amount of air and speeds the evaporation from the skin or other moist surface. A fan blowing on a dry surface will have no cooling effect more than the average temperature of the air.

Secondly, another cooling effect happens if the outer temperature is under 36C degree by pushing the hot (36C degree hot) air away from the surface over the surface of body and exchange it by a lower temperature one.

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