Question on the Reverse-flow calculator

Discussion in 'Reverse Flow' started by columbia1, Feb 3, 2012.

  1. I am in the early stages of a new RF trailer build using a 6' by 24" chamber 1/4" thick. I have downloaded the calculator for my flows thru the smoker, the question I have, when figuring the chimney diameter do you use the ID, or OD measurement. There is a HUGE difference when using 4" and 5" pipe becuase the inside diameter is 3.5" or 4.5"(respectively). For the 4" pipe, the OD would be 43" tall, while using the ID the number come out to be 55". As soon as I finished the plans I will start a new post showing progress, BTW, thank-you to everyone that has already shared their smokers in progress, this is an AWESOME site for do-it-yourself builders and I am glad to share what I have learned along side with some new ideas I am going to try in my build.

    *NOTE, I will be using 1/4" pipe for the stack.
    Last edited: Mar 27, 2012
  2. Stroke of luck, found a boat trailer in close to new shape, needs to be hack about because the wheel-base is too wide but it was only $150 with title. So far a nice start!
    Last edited: Mar 27, 2012
  3. blazer

    blazer Newbie

    4'' pipe measures 4.026 ID. 5'' measures 5.047 ID.  Use the ID size on the calculator.[​IMG]
  4. Thank-you for a prompt reply!!

    Ready to submit my metal order now :)

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