I’ve heard of the three rule, but an old timer told me the “Diameter 222” rule.
Take the diameter and multiply it by two. That’s the total number of coals for 350 degrees.
Half for the bottom and half for the top – but subtract 2 from the bottom, and add 2 to the top.
I’m using a 10”, so 2 x 10 = 20 for 350 degrees. That’s 10 for the top and 10 for bottom. Subtract 2 from the bottom for 8 and add those to the top for 12. Works pretty good.
Also, two coals are worth about 25 degrees. So every 2 coals you add, you increase the temp by 25 degrees, and for every 2 you take away, you lower it by 25 degrees.
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