I have a 25'x35'outbuilding with a hip roof. The hanging furnace that I am installing is 125000btu natural gas Trane (used). It has a 6" flue outlet. I want to run the flue pipe 18' inside of the exterior wall, or approximently 12' from the peak.
The roof pitch is 6/12. I was told that I should extend the pipe all the way up past the peak of the roof 2', Should it extend 2' from the point that the pipe exits the roof or all the way up past the peak of the roof by 2 '? The point of origin for the measurement is what is confusing me. Thanks