I periodically read a comment where someone writes about having a clean firepot after completing a cook. A typical one was made when comparing two pits, "I find that the firepot cleanout is easy, and not as often as you might think. The fan seems to keep it blown out of serious ash buildup."
So, where does this ash go? Does all of it go out the chimney?
Do you see it sitting around on the pit's insides?
Is it reasonable to assume that an equal amount is sitting on our food?
How much wood ash are we eating? How much should we be eating?