Heres a question. What type of pipe should I use? and can i use two tees? I'm considering ordering black 22ga stove pipe - $180 shipped. I hear some folks use stainless or galvanized which was my first choice but thin I found this 22ga black pipe. I'm not sure what to get any advice would be greatly appreciated. This is for an econoburn 100k and i'm about three ft from the flue.