Hello! I am Derek Hartman a retired U.S. Navy Chief Petty Officer who resides in Vinton, Ohio and is a competition KCBS pit master for Backwoods Grillin'. We have been using two Jim Bowie Green Mountain Pellet Grills for the past two years. Recently I started building a stick burner out of a 275 gallon fuel oil tank. I'm curious to know what size of stack I should mount on the smoker. This is not a RF cooker and stack will be mounted on opposite end of Firebox that I also need to build as well. Here is the current state of my smoker. If you can provide firebox size also would greatly appreciate that as well.