OK, wanted to try someone new with my propane cabinet smoker that I was never really happy with. I just couldn't get enough smoke. I picket up a side fire box, cut out the side vent in the cabinet smoker and attached then with a 10" stove pipe. Awesome smoke now and I can burn lump charcoal and wood for smoke instead of chips or pellets. The problem is that I can't get the temp up withou running the propane burner as well. I have all the intake vents closed on the cabinet an covered the bottom opening where the the burner is with foil and wrapped the connecting pipe in foil insulation still I can only maintain about 180 in the cabinet with the fire box over 400. The outside temp is around 90 here. Any suggestions?