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Considering the catigory im guessing you are asking What is an internal fan on a computer? A internal fan on a computer is just a fan than is required to keep eaither the whole system or a certain hardware cool during peak or idaling performace they are usally placed to work in 2 diffrent ways. Processor fans are mounted right on top the the processor heat sink witch is virtually glued to the processor. The heat sink directs the heat through vents and is pulled off the processor with a very fast fan. If this did not exist then the processor would not fuction with anywhere of 1 min to 5 mins of operation. thus would couse the processor to over heat and if it has a safety trigger will shut down if not will burn up. There are usally 2 to 3 other main fans in a computer the second most important is the case fan this fan is mounted inside usally on the back or side of the case and can either blow hot air out or cold air in the casing. Also there is aways a power supply fan witch always draws heat away from the power supply and prevents violent surging to coponets. Last but not always or least there sometimes a grapics (video) card fan than pulls heat off the card, these are usally found in higher end grapic cards.

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