I have a Resolute Acclaim - model 2490, about 12 years old or so. I've been running it for 3 winters now and my question is this.. The firebrick on the left side has deteriorated (I patched it back together when it was in 3 pieces with furnace cement a while back) and now is unrepairable. About 1/2 of the top of the brick is gone. I've been running it this way for a month. Am I doing any damage to the stove by not replacing the brick? When I was a kid we had a Lange that had no firebricks - so I'm also not sure of the purpose of the firebricks. Any help would be appreciated.