Square Chimney?

Discussion in 'Reverse Flow' started by wombat, Aug 15, 2015.

  1. wombat

    wombat Newbie

    I was wondering how the calculations are affected by using a square chimney rather than round. Do I use the same area or is the square less efficient as a chimney. I figure a square one would be easier to fit into the domed end of a propane tank. Is it also possible to weld it directly to the top of the FB and just open up the side facing into the CC
     
  2. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    If the numbers call for an 8 inch round.... use 8" square... that makes up for the corner restrictions....
     
  3. wombat

    wombat Newbie

    Thanks Dave. How about the idea of welding the square pipe directly onto the part of the firebox inside the dome end. It will make the whole thing a lot easier and stronger.
     
  4. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    Weld to the top of the FB then have an elongated opening to the exhaust stack.... that would be similar to the plenum opening... that would work.... I would have the opening between the two from above the lower meat rack to just above the upper meat rack.... that would make about a 10" vertical opening or something like that...
    That would make for an exhaust stack that was partially inserted into the Cook Chamber.. Good idea...
    I don't know what you would do about the junk that fell to the bottom of the stack and pile up there... Kind of a collect all place... No easy way to clean it out... You could do something like this....

     
  5. wombat

    wombat Newbie

    I could add a cover at the bottom of the opening that can be removed to clean
     
  6. daveomak

    daveomak Smoking Guru OTBS Member SMF Premier Member

    If you are worried about the stack falling over..... never been a problem that I know of....
     

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