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  1. G

    High School Shop- Reverse Flow Build

    Ok, we did a quick test burn (just using 2x4 wood we had at the school shop.). We have two thermometers. The one closer to the firebox quickly climbed to 300 while the further one slowly raised to 200-225. Suggestions?
  2. G

    High School Shop- Reverse Flow Build

    That may be better than what I had been dreaming up. We are low on 1/8"x 4" flat... lots of 1/4", but that'd be a very heavy stack!
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    High School Shop- Reverse Flow Build

    Ok, and not after doing more reading, it seems that more stacks = more friction. We just don't have anything else that size. Our best option B is to weld some 4" wide flat stock to make a 4" square exhaust.
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    High School Shop- Reverse Flow Build

    We're trying to use materials that we have on hand. We have 2.5" exhaust pipe that we could use for the stack(s). From the math provided, we'd need 132" of pipe. What I thought would look cool (and give us that volume [~650cu in]) would be cutting 4 different lengths that add up to the 132. Then...
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    High School Shop- Reverse Flow Build

    Can anyone elaborate on the benefits to having the stack protrude down into the tank more or less? My only thought is that more smoke would linger in the smoker if the stack went further down into the smoker.
  6. G

    High School Shop- Reverse Flow Build

    If I make the stack drop down into the smoker like in the "alternative" stack picture in the link, do I calculate the total height of the metal, or just what it above the smoker? For a 4x4 smoker stack it told me that I need a 40.75" stack. Sound right?
  7. G

    High School Shop- Reverse Flow Build

    4-5" up sound good for the lower grate? I need to figure this out before we cut the door. Also, is there any reason why would wouldn't want the bottom of the door to be about even with the bottom of the grate? That way the grate can slide out. I figure the door doesn't need to be any lower...
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    High School Shop- Reverse Flow Build

    What's the optimal distance from the RF plate to the lower cooking rack? I'm seeing 4-5" from what I've found via searching, but others have said closer. On a 5ft long smoker, 1 big door, or two smaller doors? Pros/Cons?
  9. G

    High School Shop- Reverse Flow Build

    Anyone have good pictures of their firebox? I'm just trying to make sure we include all the needed features. Also, what are the specs on the expanded steel you guys usually use for the grating?
  10. G

    High School Shop- Reverse Flow Build

    I think we are going to stick with the 120 gallon unit for now. We've got the tank. It'd actually take less metal to build then trying to fab up one from scratch. Though a smaller unit would be great for the future.
  11. G

    High School Shop- Reverse Flow Build

    So, maybe a 12,000ci firebox? Also, does the proportions of the FB matter much? Is taller vs longer any better? After doing the circle math, my RF should be about 7-7.5" above the bottom of the tank. Chord AB=22" Arc AB =28.375. Have you guys done math to account for a slight angle of the RF...
  12. G

    High School Shop- Reverse Flow Build

    Can you describe the difficulties of cooking small on a big unit? Again, I'm learning here. I've only ever smoked on my home grill, bit thought that this would be a fun and appropriate shop project. I have a friend who smokes as a profession and he told me that (though you won't get direct...
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    High School Shop- Reverse Flow Build

    Another question (I hope it isn't blasphemy on here), if we wanted to "grill" on our smoker, would it be able to get hot enough/what would we need to do to make it dual purpose?
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    High School Shop- Reverse Flow Build

    Ok, I got 29,631ci. So 118si opening. Then the firebox would need to be 9,778ci. From what I'm understanding, the hole from the FB to the CC is the same size as the cross sectional area of the area under the RF and also the same as the passage where the air comes around to the top portion...
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    High School Shop- Reverse Flow Build

    Am I missing the math for how large the underside passage is supposed to be vs the cooking area? Anyone have suggestions on door(s) size(s)? I do need to get more exact measurements of the tank. We just got it today.
  16. G

    High School Shop- Reverse Flow Build

    Ok, so, by being such a novice at smokers, the above build calculations are a bit tough to follow. I have a 120 gallon LP tank. It is about 5'x2'. So from there I am trying to run my numbers. 120x231 is 17720 ci. That would make my firebox about 9150 ci? For just over 33%. Sound right? I...
  17. G

    High School Shop- Reverse Flow Build

    Very nice, thanks.
  18. G

    High School Shop- Reverse Flow Build

    Hello all, I just signed up on here to stay this thread. I'm a high school shop teacher and I teach the big 3, auto, metals, and woods. We've had the idea for some time now to build a large smoker (that could potentially be used for burgers an dogs as well.) I have a friend who owns a smoking...
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