Smoke stack size

[smokerjoe]

Hey guys-
I have a reverse flow smoker that I had made. I had it made before I ever heard of feldon's calculator.
I ran my dimensions through calculator--my present smoke stack is 2" square tubing that is 7" long , which is grossly undersized according to feldon.


Here is my question: is it ok to install dual smoke stacks to reduce the

 

[smokerjoe]

(I didn't finish writing)--to reduce the total length of smoke stack recommended by feldon

 

[lendecatural]

Look at the notes on the chimney section on Feldon's, it recommends it should be around 30 inches to assure good draw. You may have to increase the diameter, so it may be easier to just cut that one out and put in the correct sized piece of pipe to reduce the surface area.