Reverse flow baffle plate advice

Discussion in 'Reverse Flow' started by wolters88, Jun 5, 2016.

  1. wolters88

    wolters88 Fire Starter


    I have pulled this together based on preliminary research and smokers I've viewed. Based on what I have seen, I recognize that the distance between the end of the baffle plate and the far end of the main smoke chamber (opposite from the firebox) is a significant measurement to allow even and uniform flow of smoke and heat throughout the main chamber. Would anyone have any advice on how to calculate the optimum measurements on the gap between the baffle plate and the wall?

    Please note this is relatively to scale, one square unit = 4", but it is not completely exact. Thanks in advance!
     
  2. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

  3. wolters88

    wolters88 Fire Starter

    I have gone through all of that. The issues I am having are the vents. It states the top should be 20% and the lower should be 80%. What does that mean? I open them to the size I need. The total size I have is 27.1434". So one should be 21.7" and the other should be 5.3"? Thank you for the help in advance. The calculator you provided for the circle was so helpful. I was way off before.
     
    Last edited: Jun 5, 2016
  4. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    You've got it....    20% upper air inlet....   80% lower air inlet on the FB ....    The lower air inlet seems to work best when it is below the grate that holds the wood...  Some folks put that grate 5-6" above the bottom of the FB....  the upper inlets works best when directly across from the FB/CC opening.......
     
  5. wolters88

    wolters88 Fire Starter

    Thank you again for the quick reply, but I'm still a bit mystified and have a couple questions.

    1. I control the dampers, so why does the lower vent need to be so much larger than the higher vent? What is the effect on the air flow that I am trying to create with this 80/20 split that I cannot otherwise control with dampers? 

    2. Is the total area of the vents the maximum or minimum size needed to allow for efficient air flow?

    3. Is the ratio of width to height of the vents significant? Example, at 80% my lower vent has to be 21" (and some change), should I proceed with a 7" x 3" vent, or is there a ratio like 3:1 I should be targeting?

    And again, thank you for the instructions, links, and answers you have provided. You have already saved my smoker from being a complete disaster!
     
  6. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

     
    Last edited: Jun 7, 2016

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