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In spring and summer we are looking for ways to cool a flat or office on hot days. As the temperature in the room in which we find ourselves increases, it becomes increasingly difficult for us to concentrate and function normally. When we cannot afford the installation of air conditioning, the best solution that will help reduce the temperature in the room is to buy a fan that does not require hot air to escape. It can be used where it is not possible to install air conditioning or leading the pipe with hot air exhaust is troublesome or inefficient. These devices cool the air thanks to the fast flow of air through the water curtain. In addition, cold water significantly evaporates the air during evaporation. A very important advantage of air conditioners is that it also cleanses the air of dust and provides higher humidity.