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I did that. I measured it. You do not understand me:
The green line, and the red line are different. Which measurement is correct?
Don't get me wrong, I COULD get up, and walk to my garage, get a tape measure, walk back, and check whether the diameter (green line) matches one of the standarts, and walk all the way back to the garage, and get back here......
Which line is the one I have to look at when buying a fan? Since 80mm (red one) was too small, I am guessing the diameter (green line) is the one fan size means.