I found this at yesterdays inspection. When you look at the chimney you have from top to bottom the water heater flue, the furnace flue, and then the mystery flue? It has a black hose coming out the bottom draining into a old glass jar. The flue pipe is cover has a handle, but the cover has been crimped or soldered on. There is another flat cover below and then a clean out. There is no rain cap outside so I suppose it could be rain water? Another interesting item is the power to the Carrier gas furnace runs through a fused 30amp disconnect listed as a Oil Burner Shut-off. The basement is practically sealed with drywall so I can not locate any old oil supply lines and the small yard is completely concreted over so no indication of a tank. What do you guys think? Image Insert: 38.71 KB