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First RF build and I need some tech help.

Discussion in 'Reverse Flow' started by butchms, Sep 8, 2010.

  1. butchms

    butchms Newbie

    I an new to the site and have a case of Smokin Feaver. I have low vision and use a screen reader on the computer. It will not read the format of the Reverse Flow Calculator . Can someone help me to find the answers to these questions?

    1- the cooking chamber size is 22D x 48W . What size round fire box is needed?

    2- What size should the fire box opening be in the cooking chamber?

    3-What size gap is needed at the end of the baffle plate be?

    4 What size and heith should the stack be?

    5- I know this maybe a dub one. Is the drain left open while cookin of is it just cleaned after a cook?

    I want to thank each of you in advance for your help.
  2. matts

    matts Smoking Fanatic

    Thats the same size smoker I am getting ready to build.  Using the DODIS' BBQ calculator this is what I found based of your dims given.

    I am taking for granted the diameter of the firebox you would be using is the same diameter, so it would need to be at least 16 long.  You can go bigger. 

    Other dimension that might come in handy.

    Smoker Volume: 18237.12 cubic inches

    Firebox Volume: 6079 ci

    Square Firebox: 18.25" cube

    Alright, firebox to chamber opening is 48.63 square inches

    You will need 18.25" square of firebox openings (vents):

    Exhaust diameter : 5" at 15.5" long or 4" at 24" long
  3. ballagh

    ballagh Smoking Fanatic

  4. butchms

    butchms Newbie

    I am ssorry I didn't put in my firebox size. I have a piece of 14D x24L 5/16 pipe that i was going to use. It would be close in area to the 22 inch if I had it

    22 x 16L= 7.65 sqft

    14 x 24=  7.32 sqft

    I hope I am right regarding sqft mass producing the same result. The entire cooking chamber will be made of 1/4 plate. The 14D pipe will weigh approx 100lb. I am conserened about the 1/4 plate warping from the weight  and heat of the firebox. I would like some feedback on this issue.

    1- Is the stack height quote with it being flush at the top of the cooking chamber?

    2- With a rounf vet opening on the firebox. What are some ideas on ways to get the 18 sq in needed/\?

    3- I might have missed it. What abot gap size at the end of the baffel ?

    Guys you have been a great help. THANKS TO EVERYONE.

  5. ballagh

    ballagh Smoking Fanatic