The computer fan is designed to keep the integral parts of your computer system from overheating.
Laptop cooling fan hack.
Most laptops require you to unscrew some screw s and then you have acess to the main board.
While operating the fans generate an acoustic tone known as blade pass.
Most computers contain two or more fans including a cpu fan a chassis fan a power supply fan and a graphics card fan.
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Make sure the fan on the laptop cooler is placed near the cpu and gpu.
If you want to use with laptop power then don t use step up converter just directly connect usb to fans and it will take 0 7a 0 14x5 0 7 speed will be slow.
Also you need a good screwdriver so you wont damage the screws.
When you will connect with step up boost converter then it takes about 1 8a current so better to use an external power bank or any phone charger.