Erik, have you looked at some build pictures? If I understand you right, most builders make a transition from the round vent arches to a flat to attach the flue. Many different ways to do this, but most involve custom cutting of bricks, unless you are making a cast part. I linked to the part of my build where I started to make the round part flat
https://community.fornobravo.com/for...510#post386510
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