Good evening, and happy holidays to all. I've been soaking up information from this site over the past few weeks. I express my unconditional gratitude to those that share their life experiences with the profound chemistry of all that is involved with burning wood. I recently purchased a commercial property for a measly $10,000. I recently received an All Nighter, Mid Moe, for nothing. (Great shape, too) I have the O.K. from my local building inspector to install. I got wood! Stove is installed! I have two interior elbows with about 6' of pipe (single wall). I then go through a block wall (horizontally) with a 3' piece of class A double wall insulated, to a clean out tee, then up 6'. This set up gets me 3' past the roof (flat roof). It seems that I have sufficient draft. When holding a lighter in the stove, the flame wants to flow up the flue. I burnt a tiny bit of cardboard and the smoke went right up the flue. I have about 15' of chimney with 3 elbows, so therefore, I have no chimney, according to some. I'm going to give it a first test tomorrow. My more experienced wood burning buddies couldn't believe it when we did the draft tests. There really is some serious air flow out the pipe. How does this "seem to work" and what can I expect if I'm wrong? Believe me, I don't mind being wrong. In fact, I thought I needed more chimney to begin with. I'll hold out until after the first run. If I have to add more chimney it will require extra support. Thanks, All! Happy Thanksgiving!