Principle of cooling:
　"The natural physical phenomenon of 'water evaporation absorbing heat' refers to: under the action of gravity, water flows down the wet curtain and forms a water film on the wavy fiber surface of the wet curtain. When the flowing air passes through the wet curtain, the water in the water film absorbs the heat from the air and evaporates, taking away a large amount of latent heat, thereby reducing the temperature of the air passing through the wet curtain."

　Device working principle:

　When the evaporative cooler is working, water is first pumped from the base reservoir to the water distributor, which evenly distributes the water to the top of the evaporative wet curtain. The water then wets the entire contact area of the evaporative wet curtain and finally returns to the base. When the fan is operating, fresh outside air is forced through the evaporative wet curtain, where the evaporation of water on the surface of the curtain absorbs heat from the air. The cold air delivered by the unit is fresh cool air that has been humidified and cooled.