I have a DSSG barrel stove door on the brick firebox and have didn't use a chimney as I read a thread here about the "crack between the boards" would be enough. Apparently I fitted my boards too tight and don't have good flow. I crack a board loose and still didn't get over 140 without cracking the stove door. With it cracked and the board loose like a chimney I was able to get up to 175 before I shut it down, but the fire was going pretty good. I assume once I got a bed of coals I would maintain heat better, but I need input on getting better air flow and heat to cook bologna and jerky.