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I punched out both 2" exhaust. I increase the diameter of the exhaust. One is 4" at 22" and the other is 3.5" at 35". I fired it up last night. It ran very well. With starting with charcoal that were white hot before I put them in the fire box, here were my temps.
450 at fire box
210 on both...
lid will need gussets, connected to the pipe for strength to keep the chimney straight when opening the lid.-- Change on thing, and deal with additional problems. Thanks for the help. by the time i'm done, I should have built it on a trailer.
when i do the volume calculation for a tank, they don't convert to the feldon calculations with out making it real short. I can use one hole for one of my temp gauges and increase the other to 4".
Thanks for the offer, but i live in michigan.
Can I, cut the space between the two 2" exhaust, half the pipe and then welding sheet metal to to join everything, this would allow a solid chimney that would be 2" x 14". What i"m trying to do is create more cooking area, and a smaller chimney foot...
can I run two 2.125" exhaust at 40.02" instead of one 2" exhaust at 80.04"
Feldon's calculations
cook chamber
height 18"
width 25"
length 43"
fire box
17" diameter
length 25"
size differential 99%
chimney
2.125" inside diameter
length 80.04"
intake
at 2" diameter need 5.42...