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I did a 12 X 16 offset. The steam goes directly up to the Cupola. Yes on trench drain. I have stovepipe 30" from back wall but it is triple walled other than the bottom 4 feet.. The only probably that I never considered, is with the arch insulated so well, it never gets above 50 degrees in there. I thought I would of had to leave the door and windows open at all times.