Thanks Wood'nCoal. I'd like to do this "right"(where right means whatever works) but I had a question on the baro dampers. On the same page you got your diagram from, http://fieldcontrols.com/draftcontrol.php
if you go all the way down to "Choosing the right size", they have a graph which states for a 6" flue, with a chimney height above 16', use a 7" damper. My chimney is 21'.
How would this be accomplished in your opinion?
Use a step ring before and after the piece with the baro? Step up just after the stove collar then back down just before the chimney? Use a T like in the diagram and a step ring behind the baro to mate it to the 6" pipe?
I hate spending money twice and would like to get an informed opinion before I do.