can I run two 2.125" exhaust at 40.02" instead of one 2" exhaust at 80.04"
size differential 99%
2.125" inside diameter
at 2" diameter need 5.42
five 2" holes and one 1" hole all on bottom of burn box.
cylinder is enclosed in a box and adjustable vents on 2 sides that are both 8.5" x 2" - just one of these would equal 1 vent if it was a square fire box. box around cylinder is just .125" stainless steel to make mating it to the cook chamber easier. I ran two so wind is not a factor. one will probably be always closed.
fire box to cook chamber opening
2" x 22.75" which equals 45.5
calculations call for 45..39
the entire smoker is stainless- so coming across 4" or larger stainless pipe for my chimney is not a normal scrap item where i work. This was made and altered off an old tilt skillet from our kitchen at work, it has a nice 1/2" thick steel plate that has a stainless steel skin on it for the bottom of my cook chamber. I just welded stainless on the lid, to lift and gain more cooking room.
I have not fired it up yet, and want to get everything right before doing so, so i have a fighting chance of getting it right the first time.