110 gallon tank is 25,410 cu. in. .... 110x231=25410....231 cu. in. in a gallon...
Now use my calculator......
25410 x 1/3 = 8470 cu. in. FB size or larger... larger recommended...
25410 x 0.017 = 432 cu. in. stack volume...... / 0.7854 x 16 (Dia. stack squared 4x4=16) = 34" tall stack x 4" I.D.
25410 x 0.001 = 25.4 sq. in. area FB air inlets... I would use 6 sq. in. (3x2) across from the FB/CC opening for the heat mover... and 20 sq. in. (3x2.25) at or below the Fire Grate for adjusting the heat output of the fire.... or something similar.....
25410 x 0.004 = 101.64 sq. in. FB/CC opening and area under the RF Plate....
Click on this calculator to open.....
http://www.1728.org/circsect.htm
... click on pic to enlarge ...
chord AB is the width of the RF plate
segment area (104 sq. in.) is the area of the FB/CC opening AND the area under the RF plate if it is 21.5" wide and 6.75" above the bottom of the CC... matching up to the opening on the FB...
Leave at least 7" at the end of the RF plate for the heat/smoke to make a 180 degree turn and head back to the exhaust stack.....
I think that covers everything.... let me know.... I'll be around..... Dave
Smoker parts have many configurations.... here are a couple.... click on any pic to enlarge ...