Don't worry about the VEC1093DBD's fan. Mine was noisy. I opened it up and all it was, the fan was ticking on something where it was all in there in its little space. No effect on charger performance at all.
In the event, I took the fan out and re-mounted it externally using the same vent louvre it was behind but now is in front of. No noise. Same performance.
Those Schu's have weird charging profiles. Just get the 1093 and you will have the best there is. Many forum members have them and will swear by them.