Occasionally as my fire burns down , the wood will fall into coals and any larger pieces on top will tumble toward the glass. When this happens, the wood also blocks the air hole in the "dog house " , which as far as I can tell is my only direct air source , besides the baffles for secondary burn at the top of the fire box. I know other posts have touched on the fact that the glass is really ceramic, etc. But the manual for my stove (Hearthstone Tribute)advises against letting wood come in contact with the glass , and cautions against letting anything block the air hole. It says that the stove will not function properly if the hole becomes blocked or clogged. What can I do to prevent this from happening. What damage would be done if this happens when I am not right there to correct it? Does it pose any danger?