Fan Issues - Inspiron 5520

Hello.

Recently my fan has begun making excessively loud spinning noises.  I've noticed that my laptop has also shut down due to overheating a few times.

I believe this issue is purely hardware as it is the same with both Ubuntu 14.04 and Windows 7.

I have an Inspiron 5520.

Does anyone know of anywhere that I could perhaps purchase a replacement fan?