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    Lee from WA asks:
    I am constructing a class B-type flue system for a Williams furnace 6551921. I plan to place it on top of a wooden room in my all metal RV barn. It is 60" to the metal roof and I have obtained 7' of B-type exhaust piping. Is there any recommendation on how to deal with the area where the flue pipe goes through the metal roof?

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