I have one of these in my basement. It is tied into the ductwork. I bought the place 9 years ago and never used it. A neighbor helped me clean out the flu. I built a fire in it with seasoned wood. It burned like hell with blowers on! My wife called out from upstairs that the house had become smokey. Smoke was seeping in through the ductwork upstairs. I opened the doors and windows upstairs until it burned out. This obviously shouldn't do this. My HVAC guy suggested a crack in the furnace could be the problem allowing smoke into the duct. I'm just not convinced that is the problem. I'd sure like to be using it now. Any advice would be greatly appreciated. I'm near Waverly. Thanks!