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To ensure a proper function of a system, keeping the temperature of all devices within their working values is very important. Since a common working range of temperature is about from -20°C to +85°C, the lower limit is generally negligible. On the contrary, the higher level could be a problem since all the devices, some more and some less, tend to increase their inner temperature. In certain situations, especially in power circuits, it is necessary to use some cooling devices in order to cool down the hot ones and make the environment well ventilated.