Originally Posted by Meat Burner
LT, 6 3/4 inch intakes is waaaaaaaaaaaay tooooo much if I understand you post. Don't know what you researched to think that is appropriate. A second that would be more than enough for any temps you wanted to reach. JMHO, I would raise the grate to 3 inches above the bottom of the barrel to allow for ash accumulation. Do what you want but my suggestion is to go throught all the UDS pages and learn from everyone else's mistake and fixes.
Ill make my coal grate adjustable so i can lower it or higher it. My friends UDS's has 6 holes in it and he seems to do fine. Plus i can always plug them. Its so i can get a better and more even burn with the coal. the attached image shows how they will be placed on the base. Like i siad if i find my temps getting to high, then i will plug em up.