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Flue liner size - Forno Bravo Forum: The Wood-Fired Oven Community


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I'm Peter Reinhart! Ask Me Anything! Monday, February 15, 2016 7:00-8:00 pm EST

To kick off our AMA feature, we have invited author, chef and master bread maker and host of Pizza Quest, Peter Reinhart, to be our first host! Peter will be in the Forum on Monday, February 15th, from 7:00 - 8:00 pm EST. If you are unable to be online during the live session, you can post your questions in the sticky post. Peter will answer those questions during the live session on February 15th. You can view Peter's answers to your questions as well as what happened during the live session in the session thread.

Ask Me Anything New Forum Feature

You will notice a new forum at the top of the main page called, "Ask Me Anything". This forum will be used for live one hour "Ask Me Anything" (AMA) sessions hosted by people who are knowledgeable in different areas pertaining to wood fired ovens. How it works:
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Dome Installation Video - Casa / Premio / Modena


For many of you who bought a modular oven, you may have asked how we put the domes together when we build them. For those of you considering one of our ovens, we shot a video to make your install easier.

Check it out on our You Tube Channel.


If the link doesn't work, simply go to You Tube and type Forno Bravo Channel. The video title is How to Set your Forno Bravo Oven Dome Pieces.

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Flue liner size

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  • Flue liner size

    The plans call for an 8" diameter flue liner for the 42" oven.
    I purchased the 8" square clay flue liner, the inside measures 6.75" square with a diagonal of 9.5" inside measurement.
    Am I ok with this flue liner or should I go the next size up? I think they were much larger. All the pics I have seen seem to use the one I purchased.

  • #2
    Re: Flue liner size

    Flue liner is sold by exterior diameter, so 8 inch flue liner has an interior diameter of roughly 6.5 inches. I believe the minimum cross section for the flue is 10% of the door area. The recommendation for an 8 inch interior diameter is round flue (mostly stainless steel, it seems) which has an area of roughly 25 square inches. A six inch interior diameter square flue has a 36 inch area. The door area on a 42 inch oven is about 240 square inches. So you should be o.k.

    Make sure your transition to the chimney is at least twice as wide as the flue (at the bottom of the funnel; taper it as you go up) to maximize your draw. I just posted pictures in the chimney section on how I built my transition and mounted my square flue, so that might give you ideas.


    • #3
      Re: Flue liner size

      I went with the 8 x 12 flue liner rather than the 8x8.
      The 8" diameter inside measurement of a circle is just over 50 square inches. The circumference is around 25 inches.
      Area of a circle:
      A = n(3.14159) squared

      r = 4 in
      C = 25.132741228718 in
      A = 50.265482457437 in

      The 8x8 flue liner (6.5x6.5) interior measurement is only 42 1/4 square inches which is less than the required flue square inches for a 42" oven.
      The 8 x 12 (6.5 x 10 interior dimensions) gives me 65 square inches of flue.
      It is over the minimum for a 42" oven but with the larger space under the flue, I should still get good draw from the chimney.
      Last edited by gtofani; 11-16-2011, 09:48 AM.


      • #4
        Re: Flue liner size

        *smack forehead* I quoted the formula for circumference, didn't I?

        Bigger is better on flues, as you know, so no harm in making it bigger. I went with 8 inch square flue and a tall stack. Seems to draw well enough.


        • #5
          Re: Flue liner size

          Easy to make that mistake, I had to find an area calculator online to figure out the area of the circle. If you dont use this stuff every day, its impossible to remember all the formulas.