Ready to have interior masonry chimney built along with new construction. Talking to builder next week. Problem is I currently have a great little 30 year old stove which has a 6 inch vent but is mated to a 8 inch metal chimney and works great. Not sure how to go with the new masonry chimney. 8 inch round is rare in these parts of Michigan. 8 inch square is easy to come by and I think it probably the best way to go. On the other hand, I've heard that the newer stoves (should I buy one in a year or so) don't like 8" flues and do better with 6". Doesn't sound right to me. Am thinking 8" square is the best overall compromise. Pleasr share your opinions. Sorry this is likely something you've batted around before but am not a regular. Many thanks for your ideas.