[chanalku91]

Of course it is abnormal. Laptop fans should be reasonably quiet and should not make noticeable noise.

Cleaning dust should be the first thing you should do now. But sometimes the fan motor may have already been loosen or fan blades not balanced, so cleaning dust cannot always fix the noise issue. If that happens, you better get a replacement as soon as possible.

To change spare parts, I usually go to the laptop's official service center!
 Because they are more professional