Engine Driven Fixed Fan?

Looks oem to me. I would take the belt off and run the engine up to the rpm you hear the noise and be sure it is not there, as AJ/FormS mentioned.

While the belt is off you can feel the wp for play / bearing noise. The other accessories as well.

Lastly, it could be you are not used to mechanical fans and the noise they make. If your cooling system is working well, maybe leave well enough alone.