@Greg Jones RT said in an email that the airbox is completely enclosed. I was letting you know for your info. Wonder how it could be completely enclosed since the firepot is mounted in it! What do you think of the foil pans? I think much better fit. The distance from grill to deflector plate is about 3 inches.Actually I said I don’t know what they call it, and I made an uneducated guess that it may be only leaking on the outside. I don’t know if it is or is not totally enclosed.