I have an econoburn 100 which I am very close to getting finished. My wife calls it my money pit, but I am having fun doing all the work myself, I did try to hire someone, but he kept putting me off, then backed out! So according to Econoburns website I can use 6" chimney on the 100 and not the more expensive 8" My unit is in a 24x30 detached garage and the chimney will go straight up. My thoughts on this is to go to a 8" T and for cleanout and then put another 8" T on top of that for my Barometric damper, all of this single wall..reducing just above the last T down to 6" for about 4' then convert to Duravent SS through the roof. Would love to hear if anyone out there has the Econoburn 100 and if they tried this??