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Offset flue - 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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Offset flue

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  • Offset flue

    I'm currently finishing two ovens with offset flues. I believe there are some advantages doing it this way. Firstly the oven can be located under cover, the mouth certainly which is the most important part to keep dry. Secondly it negates the problems of penetrating the roof, namely sealing problems, having to use a double flue and roof corrosion around where the flue penetrates from corrosive emissions. The drawback is the look of the thing, I'm undecided about that, it does look a bit "industrial" The extra bends also create some extra cost and installation time.
    Kindled with zeal and fired with passion.

  • #2
    Re: Offset flue

    I have an inherent problem in my indoor build; the flue exits right behind the oven. I had two choices, either to make the offset like yours which will make the whole thing look "industrial", or to make the flue more aggressive with upright angles so it can be flush with both the oven enclosure top and the wall behind the oven. I believe the second choice will result in a hesitant airflow and will make the oven "breath" inside the whole kitchen. I installed a ventilating fan on the flue exit in order to force the exhausts to go into the flue but am not sure the fan will be always available (The electricity goes frequently being exposed to projectiles ) I'm no longer sure what is best to do.
    Why is this thus? What is the reason for this thusness?
    I forgot who said that.

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    • #3
      Re: Offset flue

      Gday
      If you were to use 2x45 degree bends instead of 1x 90 degree bend to get to the horizontal, then 2x 45 degree bends to get back to the vertical, it would achieve a couple of things.
      It would make the 90 degrees transition a lot longer and more gradual and make the smoke passage a lot smoother. It will take up more room in the transition making the horizontal section a lot smaller.
      I'm no expert by any means but smokes doesn't like to go sideways or horizontal it wants to go up so the more time spent in those 45 degree bends the easy the flow I'm thinking.
      Regards dave
      Measure twice
      Cut once
      Fit in position with largest hammer

      My Build
      http://www.fornobravo.com/forum/f51/...ild-14444.html
      My Door
      http://www.fornobravo.com/forum/f28/...ock-17190.html

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      • #4
        Re: Offset flue

        Originally posted by v12spirit View Post
        I have an inherent problem in my indoor build; the flue exits right behind the oven. I had two choices, either to make the offset like yours which will make the whole thing look "industrial", or to make the flue more aggressive with upright angles so it can be flush with both the oven enclosure top and the wall behind the oven. I believe the second choice will result in a hesitant airflow and will make the oven "breath" inside the whole kitchen. I installed a ventilating fan on the flue exit in order to force the exhausts to go into the flue but am not sure the fan will be always available (The electricity goes frequently being exposed to projectiles ) I'm no longer sure what is best to do.
        A horizontal flue is a no no. Make it go up at an angle otherwise you will be depending on your exhaust fan to do the draw.
        Kindled with zeal and fired with passion.

        Comment


        • #5
          Re: Offset flue

          Thanks Dave and david
          Your inputs inspired me to use a kind of flexible flue liner like the one below, I think it will enable me better smooth-en the draw, while trying to keep pace with the enclosures and hide the flue. If I find one I will use it.
          Name:  35d7cfc98f26df341d699b0bf2c7f452.jpg
Views: 1
Size:  33.4 KB
          Why is this thus? What is the reason for this thusness?
          I forgot who said that.

          Comment


          • #6
            Re: Offset flue

            I am having the same problem and have been thinking to move my chimney to the middle or back of the oven?

            If I keep it in the front the chimney will be under my roof line and 1. I dont want the fire risk 2. I dont want smoke sooting up underneath my covered outdoor area.

            Has anyone moved an chimney to the back or middle of the oven? What was the outcome?
            Thanks,
            John

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