I can unfortunately only four stars awarded since the Umluftheizring is not round. After installation I have the fan manually by rotating and notice had that the fan rubs against the ring in two places. The problem I solved by I turned the screw holes with an air sander in long holes and so able to position the ring optimally. This is my second replacement ring, the original Built went after two years no longer (2003), then installed a spare ring has held until 2014. Who keeps this again as long, then I'll buy a new oven.
