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  • Vent & Chimney design

    Hi. I have decided on a 1000mm oven. I have constructed the base etc and have the materials ready to start the dome very soon. I am wondering about the design of the vent and chimney. I have attached my current design and would appreciate anyone out there having a look and giving me some feedback on it. I plan to make the height of the dome between 400mm to 500mm (17"-20"), opening is 480mmx290mm (20"x12").

    My main concern is that it will not draw well. Chimney opening is 360mmx115mm (15"x5").

    I have not yet decided on chimney style or height at this stage.

    Regards,
    Jason
    Attached Files
    Last edited by pizzahead; 09-16-2008, 11:11 PM. Reason: Typo

  • #2
    Re: Vent & Chimney design

    Hi Jason,
    I would make your vent at least double the size. The width is OK but only 115mm deep , I don't think will handle the smoke and it will spill out the front and stain your face bricks
    Make your void one and a half bricks rather than a single brick which will double your area to collect and funnel the smoke/gasses up your yet to be decided chimney.
    Check out my void which is much bigger and works a treat at:

    http://www.fornobravo.com/forum/f8/n...-1-a-2005.html

    It is a 40"Pompeii complete build, just follow the prompts.

    Neill
    Prevention is better than cure, - do it right the first time!

    The more I learn, the more I realise how little I know


    Neill’s Pompeiii #1
    http://www.fornobravo.com/forum/f8/n...-1-a-2005.html
    Neill’s kitchen underway
    http://www.fornobravo.com/forum/f35/...rway-4591.html

    Comment


    • #3
      Re: Vent & Chimney design

      Thanks for your prompt reply Neill.

      Do you mean like the attached?

      Cheers
      Jase
      Attached Files

      Comment


      • #4
        Re: Vent & Chimney design

        Exactly Jase.
        It will be twice the area and closer I believe to what will be needed. It will be 0.028 square metre when your original one was only 0.01414 square metres in area.
        My vent is relatively large being 600mm wide X 390mm deep, (0.234 square metres in area) funnelling the smoke and gasses into an 8" flue.
        It is best to have a little caution now than to wish that you had done it initially.
        I am making a similar unit for Paul Henderson's Pompeii which will be 490mm wide X 245mm deep(which is a less but that is already bricked up and I will have a deep funnelling action to reduce any smoke exiting the front archway only 0.12 square metres in area). Much less area but as it is already bricked up I need to make it deep funnelled to reduce any smoke exiting the front arch.
        I just need to get my backside going to complete it ASAP.
        I have attached a picture of my stainless chimney

        Neill
        Prevention is better than cure, - do it right the first time!

        The more I learn, the more I realise how little I know


        Neill’s Pompeiii #1
        http://www.fornobravo.com/forum/f8/n...-1-a-2005.html
        Neill’s kitchen underway
        http://www.fornobravo.com/forum/f35/...rway-4591.html

        Comment


        • #5
          Re: Vent & Chimney design

          Neill. Thanks again. Am I correct in assuming that you cannot have a vent that is too large? I couldn't agree with you more that I need to get this right now rather than construct it and then wish I had done something different.

          I Have change the design again to have a vent opening of 580mmx230mm which woudl give me 0.13m2 area (see attached). Looks like you got your chimney and vent fabricated to fit your sized opening.

          Cheers
          Jase
          Attached Files

          Comment


          • #6
            Re: Vent & Chimney design

            There is a posting somewhere here in the forum that calculates the efficiency and flow factor for chimneys. With my measurements, it comes in very high up the scale and draws exceptionally well.
            Your draft #3 is even better (0.1334 square metres), than your other 2 and I would be happy with these figures in a new oven that I was to build.
            The only problem with a larger void is having to reach a little further into to oven but that is a small price to pay for the benefits of a larger smoke free entrance/void.
            Check out:

            http://www.fornobravo.com/forum/f28/...ator-3905.html

            there are a host of comments on this topic.
            I hope this helps.

            Cheers,

            Neill
            Prevention is better than cure, - do it right the first time!

            The more I learn, the more I realise how little I know


            Neill’s Pompeiii #1
            http://www.fornobravo.com/forum/f8/n...-1-a-2005.html
            Neill’s kitchen underway
            http://www.fornobravo.com/forum/f35/...rway-4591.html

            Comment


            • #7
              Re: Vent & Chimney design

              Thanks again. What did you use for a chimney?
              Cheers
              Jase

              Comment


              • #8
                Re: Vent & Chimney design

                I had a spare length of 8" slow combustion stove flue and purchased 2 more. They just push together and sit in a snug hole cut into my stainless 'funnel and rise 10' high.
                I might put in a couple of bends in the chimney so as to by pass the new patio roof rather than run it through it. Final decision yet to be made.

                Neill
                Prevention is better than cure, - do it right the first time!

                The more I learn, the more I realise how little I know


                Neill’s Pompeiii #1
                http://www.fornobravo.com/forum/f8/n...-1-a-2005.html
                Neill’s kitchen underway
                http://www.fornobravo.com/forum/f35/...rway-4591.html

                Comment

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