Cool -- thanks. The 140 mark really helps. I can't wait to see how easy it is to regulate (and elevate) the temperature in my rather big cooking chamber with my sort of small firebox. I am welding a cylindrical Char-Grill firebox from Lowes perpendicularly onto the back side of a sideways oriented drum smoker, 48"x30". The two drums will look like a "T" from above. Smoke will enter the cooking chamber via a 4" flue, equaled by the two 2" diameter stacks. The O2 intake is adjustable and on the opposite end of the firebox (of course). My welder tossed some paper in there and reports that the draft is excellent. But I don't know if I can get enough heat into the main chamber to reach those higher temps. Next week I'll know -- a report and PRON will follow!
Big homemade smoker on a trailer, Weber grill, firepit