I have an old Schrader and was wondering what I can do to make it burn more efficiently? It has firebrick lining, will be attached to 8" pipe all the way out. Should I install a damper in the flue pipe? Should I place a piece of sheet metal to deflect the flames as it would go straight up the pipe basically? it has 2 screw open/close type dampers on the front with some sort of air wash on the back of the doors where the air will come in ...just wondering what to do for max heat and burn times for now, I hope to upgrade to a new unit by next season.