Go by the math, and really, you could go with 1/2" gap, thats what I normally do.
Another 250 gallon RF Build Thread (My first build) - Page 3
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The exhaust diameter should calculate to the size of the Cook Chamber and be about 30-40" above the Cook Chamber for the finished height.....
At least you have choices for exhaust pipe, buy some 6" pipe (scrap or new), go with double 5's, or make a square one out of 3" angle if you have some of that laying around (would be another 12' of welding). All would work equally well as long as you stick with the volume from the calculator and minimum height Dave mentioned above. Good Luck and great looking build!
Made a plunger so to speck to pull ashes from back to the hole.
Starting to look like a smoker!
I angled my top plate, so actually raised my reverse flow plate another inch on my most current build.