Does anyone know where I can get double or triple wall pipe for my small (3720) godin stove.The outside diameter of the vent is 3 3/4 inches, so I assume I need 4 inch stovepipe. I am installing it in my yurt. I can get single wall, but that's it. I will also need to know the outside diameter of the pipe so I can try to get a gasketed tarp piece to attach to the roof. Has anyone done this with this type of stove? Other than expense, it seems like the perfect thing for my yurt. Thanks from Idaho.