You have to separate the fire box area from the meat. The easy method is to go to your local garden store and purchase a 16"diameter terracotta bottom for a planter. You place this on a grill rack wrapped in aluminum foil, the reason you wrap in aluminum foil is to make clean up easier. I have also made a 1/4" steel plate with holes drill in the perimeter. 
Either design will allow smoke and heat to travel up the side of the smoker without direct heat on the meat. If you what a water pan just place it in the center of either plate.
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