Hello all, I'm currently researching how to line my oil furnace terracotta 8in by 8in existing chimney with a stainless steel liner. I'm hoping that I can gain some information and tips about the best way to go about this. I have some initial questions but I'm open to all pieces of advice. 1. What is the best liner to use for a oil burner furnace exhaust. Meaning should it be a double wall stainless steel or is single wall acceptable? 2. For an oil burner and the fact that this is going to be a tight fit if I use a 6 in liner can I get away with not using a wrap around insulation on the liner? 3. Do I need a T-body for the bottom of the chimney or should the liner just begin to pitch on a 45 and come out of the cinder block wall near the furnace? 4. Last question... I have one challenge that I'm going to face for sure when pulling or pushing this liner down to the basement. That challenge is a piece of terracotta tile that is slightly shifted about a half an inch to 1 inch out of line from the rest of the tiles. Has anyone had to face a similar challenge and was there any tip on how to best overcome this obstacle?