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Newbie with stupid question - 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:
- Each AMA will have a "sticky" thread where the community can post questions they would like answered during the live session. This will allow everyone to participate even if you can't be online for the live session. These questions will not be answered by the host until the live AMA; if you need an answer quickly, you should post it in the appropriate Forum area for the community to respond.
- Another thread will be posted for the live AMA. Registered users who are logged in during the live session can interact with the host by asking questions and receiving responses.
- The live thread will remain in the AMA forum to view after the session.

We hope you enjoy this new feature! Please let us know if there is a topic that you'd like to have as an AMA and we'll look for a host!

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Newbie with stupid question

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  • Newbie with stupid question

    Hi Folks

    I noticed that the chimney flue is outside of the door arch. Why is this the case? Does it draw better?

    Thanks

    Bert
    Fail to Prepare...Prepare to Fail!

  • #2
    Re: Newbie with stupid question

    The chimney in front of the dome is the best set up IMO. For my first oven I placed the flue in the centre of the dome with no flue pipe. This is the same set up as a Roman kiln used by the ancients. It drew really well and there was no entry to have to work past and much simpler construction. Saw two ovens at Pompeii using this design.The downside was that you have flames shooting out the flue hole and they are wasted heat. The second oven I built I placed the flue near the door but still inside the oven. I finally built one with the flue at the front and outside the actual oven.a couple of thousand years Roman ingenuity can't be wrong. It is the best IMO.
    Kindled with zeal and fired with passion.

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    • #3
      Re: Newbie with stupid question

      Thanks David. How did your second oven draw? Bert
      Fail to Prepare...Prepare to Fail!

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      • #4
        Re: Newbie with stupid question

        My second oven did not draw as well as the first. When you are using the power of your flue to bend your flame sideways there is more smoking at start up. The flue will only start working once it has warmed up. This does not happen with the central flue design where the smoke heads for the flue at the top of the dome in a direct path vertically. I also had my flue (second one) exiting the oven without any funneling into the flue pipe. This is important so the smoke has somewhere to gather and the direction change is not so severe. It is like a car with extractors rather than the standard manifold.
        Last edited by david s; 04-18-2011, 05:28 AM.
        Kindled with zeal and fired with passion.

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        • #5
          Re: Newbie with stupid question

          Bert, I would venture to say that positioning the flu outside the arch traps more heat inside the dome....That is what you want for higher oven temperatures, smaller fires and less wood consumption.

          Originally posted by Bert View Post
          Hi Folks

          I noticed that the chimney flue is outside of the door arch. Why is this the case? Does it draw better?

          Thanks

          Bert
          Lee B.
          DFW area, Texas, USA

          If you are thinking about building a brick oven, my advice is Here.
          Our One Meter Pompeii Oven album is here.
          An album showing our Thermal Breaks is Here.

          I try to learn from my mistakes, and from yours when you give me a heads up.

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          • #6
            Re: Newbie with stupid question

            There are modern ovens, the south american "hornos" that have the flue inside the dome. We've seen people try this plan, and it's really bad for fuel economy and heat retention. The masonry oven basically works with a circular path for combustion gasses, with the air coming in from the bottom of the door, circling around the dome, heating it, and exiting through the top of the doorway. If you interrupt this path, you lose a vast percentage of your heat up the chimney, and loose the ability to retain heat for things like bread baking.

            Experience shows that you're better off having no flue than one in the top of the dome.
            My geodesic oven project: part 1, part 2

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            • #7
              Re: Newbie with stupid question

              So do these magnificent round Italian commercial ovens (the kind with the gleaming tile enclosures) route the flue from the front or do they come straight out the top?

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              • #8
                Re: Newbie with stupid question

                So do these magnificent round Italian commercial ovens (the kind with the gleaming tile enclosures) route the flue from the front or do they come straight out the top?
                They have an angled flue path from the front. The center venting is simply for aesthetic reasons.
                My geodesic oven project: part 1, part 2

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