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  • #16
    Re: Keystone Size

    What size is your inner arch opening?

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    • #17
      Re: Keystone Size

      Not exactly sure yet, I don't know how I'm gong to build it. A complete arch or one like the image below. I'm leaning towards the one one in this image.

      Link to my oven build on YouTube:

      http://www.youtube.com/watch?v=Ujb7lqVcSzQ

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      • #18
        Re: Keystone Size

        Well, if you built that one, it would be 225.8 SqIn, so you would need a minimum of 33.87 SqIn of draw, and really more would be better unless you plan on a tall stack.

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        • #19
          Re: Keystone Size

          I have 235sqin so if I go somewhere between 35 and 40 sqin for my vent opening I should be ok.

          What are your thoughts on the arch itself? I was thinking of a 36" stack... too tall? I'ld love to be able to do it a little smaller.
          Last edited by K79; 03-13-2013, 12:25 PM.
          Link to my oven build on YouTube:

          http://www.youtube.com/watch?v=Ujb7lqVcSzQ

          Comment


          • #20
            Re: Keystone Size

            Then use an 8" round metal flue, that gives you 50.26 SqIn. 36" is a short stack, so the extra will help.

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            • #21
              Re: Keystone Size

              I was trying to figure it out building it out of clay flue liner and brick. I couldn't find anyone local that had any ideas on how to run the 8" ss stack out the peak of the roof. Issues with the weather stripping and such. This and cost has pushed me towards the clay option. would 40 sq in work with a 36" stack?
              Link to my oven build on YouTube:

              http://www.youtube.com/watch?v=Ujb7lqVcSzQ

              Comment


              • #22
                Re: Keystone Size

                I do not understand the difference between piercing the roof with double wall pipe or masonry?

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                • #23
                  Re: Keystone Size

                  Originally posted by Tscarborough View Post
                  I do not understand the difference between piercing the roof with double wall pipe or masonry?
                  I don't either... this is all new to me.
                  Link to my oven build on YouTube:

                  http://www.youtube.com/watch?v=Ujb7lqVcSzQ

                  Comment


                  • #24
                    Re: Keystone Size

                    Originally posted by Tscarborough View Post
                    Square/rectangular flues are measured o.d., while round ones are measured i.d., FYI.

                    8x8 is a common size for clay flue liners, with 30.58 SqIn of draw: 6.25 (i.d.)/2 gives a radius of 3.12, 3.1416x(3.12x3.12)=30.58. When calculating draw you draw the largest circle(s) that will fit in the area and use that dimension. The area of the flue should be around 15% of the size of the inner opening, and more is better up to a limit.

                    (the floor size doesn't really matter for draw)
                    Tscarborough,
                    Hope im note butting in I'm new to the furum. (More is better to a limit.) What is that limit? I'm thinking of using 8 x 17 flue on a 40 inch oven.
                    K79 been reading your build looks good.
                    Respectfully,

                    KB

                    My build
                    Oven Pics (album under construction)

                    Comment


                    • #25
                      Re: Keystone Size

                      Originally posted by kbartman View Post
                      Tscarborough,
                      Hope im note butting in I'm new to the furum. (More is better to a limit.) What is that limit? I'm thinking of using 8 x 17 flue on a 40 inch oven.
                      K79 been reading your build looks good.
                      That seems like a lot. It'll be interesting to see what everyone thinks.
                      Link to my oven build on YouTube:

                      http://www.youtube.com/watch?v=Ujb7lqVcSzQ

                      Comment


                      • #26
                        Re: Keystone Size

                        Basically, the draw would be twice an 8x8, the floor size doesn't matter, what is the inner arch opening size?

                        They make the flashing for the double pipe penetration, the masonry chase is done with step flashing. In either case you probably want to offset it so that it penetrates a flat plane not the ridge. In my case I made it a shed roof for more protection in front and I didn't want to offset the flues.

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                        • #27
                          Re: Keystone Size

                          I limited to 8" on my depth and the 8" X 17" was one of standard flues stocked at the brick yard,the other were to small or to big. I thought it would work. Now I'm unsure

                          The other day Utahbeehiver was worried about highjacking someone's thread to answer one of my questions. Is this consider highjacking? Dont want to affend anyone. I need all the help I can get.

                          Thanks
                          Respectfully,

                          KB

                          My build
                          Oven Pics (album under construction)

                          Comment


                          • #28
                            Re: Keystone Size

                            Up to the OP on the highjacking, some threads wander all over. That size should be OK, though.

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                            • #29
                              Re: Keystone Size

                              Thanks,
                              Tscarborough, OP?
                              Respectfully,

                              KB

                              My build
                              Oven Pics (album under construction)

                              Comment


                              • #30
                                Re: Keystone Size

                                Original poster, the owner of the thread.

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