So I just installed an Englander 28-3500 add on furnace. It has really impressed me so far. My question is, has anyone added a metal plate to lay on the bottom floor on top of the firebricks? The firebricks have large openings in between them to allow ash to fall down into the ash pan. The problem is, the openings are so large that red embers are able to fall through as well. There is never much of a dead ash or a pile of hot coals left on the floor. It would seem to me if there was a stainless steel plate covering the majority of the holes that you could get much longer burn times and much easier to re-light fires. Anyone done anything similar?