How To Keep Charcoal Lit In Smoker. First, pile the charcoal onto the grill in the shape of a pyramid. The second strategy is to add lit coals, which is important when the temperature drops below 225°f and you need to increase it quickly.
The gap makes sure that air can still reach your fire and keep it burning, but the enclosure will shield the grill fire so that the wind will not be able to blow out the fire, or blow loose ash onto the lit coals which can act to suffocate them. Therefore, stacking your charcoal allows heat from the bottom coals to rise up and into the top coals. Heat, as you may know, rises.