Now, i happen to know that Brian does not yet have a suction fan......
Well then what was stuck down the stack to draw a draft? It is the nature of the beast. Just about anything that sits on top of the stack and draws a draft, (even the Aster suction fan) will take the paint off in short order in the area pictured. It is paint on brass in a area of high heat, oil, and water. Add to this, the vibration of the fan (or what ever else) used. The paint is going to flake off, plain and simple.
As far as your trashing of Hans, well I do not buy it. I have not known a single person that did not get treated fairly and with respect from him. He has gone above and beyond filling parts orders and trying his best to make things right for people around here.
There is an old saying, "You can't keep everyone happy all the time", and in this case I am sure that Hans has tried too.