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I have an Endurance 50F pellet furnace and it needs and OAK added for better balance. The outside diameter of the pipe is 2.5". The manufacture said to use 3" diameter metal piping. It should not be the foil wrapped dryer style.
Lowes had some 3 inch when I was looking for mine, I needed 2 inch. I wound up using flexible automobile exhaust. It was much stiffer and more difficult to bend but I was able to get it to work.