15,080 x 1/3 = 5,027 FB volume or larger is better for long term smokes...
15,080 x 0.017 = 256 stack volume ... 3 1/4" ID (3" pipe) 36-40" above the CC...
15,080 x 0.001 = 15 sq. in. FB air inlet + an additional opening of 4 sq. in. across from the FB/CC opening
15,080 x 0.004 = 60 sq. in. FB/CC opening
using a radius of 10
segment height (ED) of 5" = FB/CC opening of 61.4 sq. in.
chord AB = 17.25" the RF plate width needed to fit 5" above the bottom of the CC....
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Air inlets for the FB........ You need 12-15 sq. in. .....
2" hole is (2x2x0.7854=)
3.14 sq. in. .... so you will need 4 each 2" holes for the fire grate area and probably 1 each 2" holes across from the FB/CC opening in the top of the door...
I apologize for the confusion..... If I knew how many folks I helped daily with smoker builds, I could prove where the confusion comes from.... (old age and getting addled...):th_roflmao: