Hello from the PNW. My name is Mike and I'm building an offset firebox bbq/smoker. I'm here to gain some info and use the draft calculator this forum has provided. Thanks in advance for the help. Here is photos of my project. It is a work in progress, I've been at it off and on for a week. The fire box is tacked together, and ready to hang as soon as I gusset the legs of the smoker.