Hi there guys, I have spent several hours researching and looking at pipe and i just cant seem to get everything worked out for this application. I have a rear vent wood stove that is only about three feet from the chimney, but the problem i have is there is drywall between the stove and chimney. I am looking at coming out the rear of the stove with a 90° elbow then up vertically three feet. The plan is to then take another 90° elbow back to the drywall 18", pass through the drywall with a thimble, then out the other side 12" and in to the chimney. One of the problems i have been encountering is there are no "through drywall" thimbles. Most of the ones i look at are a 6" minimum wall thickness. I can frame up the drywall with 2x4 but that still leaves me around 4". Do i frame it up with 2x6 instead? I originally wanted to run as much single wall pipe as possible for cost savings and more heat in the house but i can't see that happening any longer. I have called up a couple companies to discuss what they thought and was just told i should run stainless steel triple wall pipe the entire way, leave a 2 inch gap around where it passes through the drywall and put a collar on it. That sounds extremely expensive. I kind of broke the bank on the wood stove so i am looking to do this in a safe but cost effective manner. We wouldn't have our beautiful wood stove if it wasn't for your help so i know you will steer me in the right direction.