Mine has a noisy fan and I was worried, having read here about some troubles with that. I took it apart and it was the fan housing when stuffed into its slot rattling on something. Perfectly quiet fan when out of the (padded) slot. It is not screwed down. I could not figure what was actually making the noise or find a quiet position in its slot, but at least it was nothing that was going to make the charger not work.
It looks like a good fix for the noise would be to take the fan right out and mount it externally with screws or use any other similar fan. I have the fan off my broken Paramode converter that would work there. Not bothered by the noise enough at the moment to do that now I know it is harmless.