ok so I bought 2 4 feet sonotube, one is 8-1/4" inside diameter the other is 10-1/4" I.D. I was thinking 10" and 12" but I tough maybe it would cost to much gas for nothing. I didn't choose the length yet but I'm thinking maybe 18" with what you guys wrote. I didn't count the in.cu ill have inside yet but I will and I will adjust so I can have max 2 burners.
the_white
P.S It's Friday now, just finished work and I have to wait until Monday to do the road trip to go buy the stuff I need to build my first forge..... I'm already going nuts, I just wish they were open on weekends.