I broke down at the fiddly assembly of the fan.
I MMN only easily one of the rotor blades with forefinger and thumb fixed, there was a slight crack and I had it in my hand, it was just canceled. So be careful when installing.
Otherwise I can not fault the TY-141 Thermalright. Although he is not inaudible but very quiet. I notice it only when it is absolutely quiet in the room. Currently the CPU cooler running with only one of these fans and it would be enough but now with two fans I can possibly see him at 600 rpm drosseln.Mal.