smoke stack size

[Lyle]

I have a raised flue 2x6 with 8 inch smoke stack. Does anyone use 10 inch on a similar size rig? Would that be adviseable? As it is my pipe goes up 3 feet and then goes out a side wall before going up another 6 feet. I am going to remedy that at the end of this year and was wondering if I should go bigger as well.

[RUSTYBUCKET]

My 2x6 dropflue, with natural draft, came stock with a 10" stack.

[wiam]

My 2x6 came with 10"

[RollinsOrchards]

Those two bends are killing your draft, get that smoke going straight up and you will be happier.

Last year I used an 11 inch single wall stove pipe on my oil barrel stove, this year I reduced that to 8 inch metalbestos insulated type chimney pipe, and have not noticed any difference in evaporation rate. I believe the draft has improved with the insulated chimney, but it is hard to tell after only two boils.

[nymapleguy607]

My 2x6 has 8" pipe going straight out the roof. One benefit of a larger pipe size is you would need less pipe to get enough draft. Most companies advise 2x the length of the evaporator for adequate draft. I did the math on the total volume of a 10" pipe at 12' and to get the same amount using 8" you need to be around 17' and that is still slightly undersized. I haven't noticed a real difference in evaporation either I am still running around 40 GPH and my stack temps are around 1200.