Question: Question about using glass heat shields for wood stoves that we have sent to some glass manufacturers and suppliers. Perhaps you have some thoughts and experience on the use of glass wall protectors. (Perhaps a formerly exterior brick wall -- with standard 1" air gap between the inner surface of the brick and the wallboard over wood studs -- doesn't need a wall protector.) Answer: first of all- the clearances are already reduced by the brick. The clearance reductions are:If the brick has wood right behind it (touching) 33% to the original combustible wall If the airspace is there - 66% to the original combustible wall. Secondly- the glass would not have to be any better than standard tempered. This is good to 400 degree plus- and would not hit this temperature in this situation. Hope this helps.