That is the fan for the power supply and is not one that is attached to the computer case; you don't want to be messing with that unless there is something wrong with it and you don't mind voiding your power supply's warranty by opening it up.
BTW, you shouldn't even be opening up your power supply unless you really know what you're doing.
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The whole point of this is that the fan doesnt work well and sometimes my computer shuts off from overheating I think so im wondering if by taking off the side panal maybe it will stop it sortof or I could just run a fan by it