Without adequate cooling, a CPU or other internal equipment can overheat. The extent of damage depends on the level and length of time. Minor overheating can simply reduce the life of the hardware, whereas prolonged overheating can in fact irreversibly damage hardware. With ever increasing hardware speeds, this can take place in a matter of seconds. An internal computer fan is pretty much like a normal household fan. It is used to reduce heat on internal hardware by moving away the hot air produced by the hardware.
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