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Chimney options - Forno Bravo Forum: The Wood-Fired Oven Community


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Chimney options

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  • Chimney options

    > hi everybody,
    > since i just finished the dome this last saturday, i myself too, feel
    > that i am done building my breadoven and are now able to start
    > cooking......


    > i have another question however, concerning the vent and chimney?
    > can i get the steel vent and flue at home depot or do i have to get it
    > custom made? i know some of you just did it yourselfs, cutting steel
    > and welding it together. it looks easy enough, but i don't know how to
    > welt yet. (learning to weld is a project for some other time).

    Yep. Home Depot carries stove pipe & chimney toppers that will work.
    Get a 3' or longer pipe section (the stainless steel double-walled one
    will last years & years) and a chimney top that fits on top. The
    chimney top will provide a spark arrestor function.

    > would a chimney of 2 feet lenght be enough or would 3 feet be better? i

    3 is better as it will draw more. In fact if you can get it a foot
    taller than the roof will be (within 2 feet) that's best. (The "within
    2 feet means you measure out 2' from the chimney location and mark the
    highest part of the roof you hit. Make the chimney at least 1' taller
    than that -- it helps provide room for the draft to exit the chimney.
    So in the case of mine where I've got a steeply pitched A-frame roof,
    it really only had to just come out the roofing but it actually sticks
    up about 10".)

    > am intending on using a 8inch steel round chimney.
    > also, can i use the same portland/fireclay/sand mix to cement the steel
    > vent & chimney in?

    Good size. I've got a 9x12 rectangular one that draws like a champ.
    Any smaller than 8" may not draw quite as well so you'd want to have
    more of a baffle in front of it to force the smoke up the chimney
    (which will lower the front door).

    > has anyone some piece of advise? what i should avoid?

    Avoid the plain galvanized pipe sections. They'll outgas some nasty
    stuff because this will get *hot*. They will also corrode over time
    with the effect of the acidic smoke & burning galvanization...probably
    only last a couple/three years. The single-wall black chimney pipe is
    better (next best to clay flue liners & stainless steel double-wall).

    > any advise is very much appreciated!
    > thanks to all of you to get me so far
    > simone

  • #2
    Re: Chimney options

    Any ideas what type of store will carry terra cotta pipe? I have been burning up google and so far no luck.


    • #3
      Re: Chimney options

      Terra cotta pipe? Like drain tile? It's become increasingly obsolete since the introduction of perforated plastic pipe. There was also a glazed clay sewer pipe that's disappeared for the same reason.

      Since this is an oven blog, you may be talking about refractory flue tile, which is a standard masonry item, and should be available at any brickyard.
      My geodesic oven project: part 1, part 2


      • #4
        Re: Chimney options

        They still make and use clay pipe, glazed and unglazed, but neither is suitable for the chimney on a WFO. Just ask for "clay flue liner".