Not sure what you mean. The fan is very small and spins to blow air across a heat sink that is attached to the processor. It isn't attached to anything but itself and the housing that screws to the motherboard or case.
It depends on which type of laptop fan you are asking about. There is a an internal fan inside your laptop which is very small anywhere from two to one-inch in diameter. There are external fans you can buy to place under the laptop to dissipate heat radiating from the shell. These are much larger with more throughput of air.
Dell's latest BIOS for your laptop features an improvement which keeps your laptop quieter, longer. They do this by raising the temperature at which your laptop must get to before the fan turns on. It may seem like your fan never turns on, but the truth of the matter is your BIOS is telling your fan not to turn on because it simply is not hot enough yet. Rest assured, when your laptop gets too hot the fan will kick on.
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