I have been asked to install a wood cook stove, but I haven't had much experience with them. I am looking at reducing it from 7" to 6" with a total system height of ~15'. I don't know how these appliance tend to draft. Do they tend to draft better than average or worse? If the flue gas temperature tends to be on the hot side, I wouldn't mind reducing. If you've burned one, please let me know your experiences