In my experience with charcoal, the bigger the pile of charcoal, the bigger the fire since it requires less air to burn than coal. You have to make sure to keep it wet on the outside to keep the fire from spreading and too much water douses the fire down. It's definately a fine balance that comes with experience and I still can't say I'm a master at it. I just let it burn usually and keep the fuel pile the size I want to burn.
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