Every other year it seems I have to replace at least half of the fire bricks in my wod stove, usually both sides. This year (after replacing them last fall 07), half of them are pitted and a couple are cracked again. On occasion the stove gets a hot burn going in it after I have loaded up the stove and have forgotten to turn down the damper only to remember an hour or so later. I heat with wood so it is on 24/7 from mid-end of October through till the middle - end of April. Are all fire bricks created equal? I do use the manufactures brick or at least what my retailer says are the correct brick. Are a couple of hot burns enough to cause havoc on them? Just curious as to the life expectancy others are getting out of theirs. Thx.