Originally Posted by foam2
.... Just because a 2" hole came on the drum that was designed to store and transfer fluids does not mean that by coincidence that it is the optimal size to control exhaust on a UDS at any temperature.
No, but it DID dictate what size most experimenting was done on.
Personally, I just drill 8 3/4 or so sized holes in the perimeter of the lid.
My new drums use a single 2 inch intake, but my old ones had the smaller intakes. My temperature was chiefly dictated by charcoal basket. I had a small basket and never could get above 250. With the bigger basket.... 350.
Lots of variables at play, but I am just a hick from the sticks.