This is the bad thing about the forums. I don't know if you are offended, slapping yourself on the forehead in a DUH moment or being snide. Of course, if I had not already showed my ignorance, you would not know if I was being condescending. Not a correction just that I had to stop and take note of it. To me it was a hot red chunk of cast iron. It was a first for me. We simply don't have a lot of OLD stuff like you northern folk. The forth "eye" acting as a pit to keep stuff warm in is just odd. On another note, my client was not so interested in the performance of the HVAC systems. They, present owners of an old home, intended to do as everyone else with these old homes does. Freestanding gas space heaters and window units serve are the primary sources of conditioned air. The houses are sieves. The furnace in the photo is only 6 years old. Click to Enlarge 38.55 KB Click to Enlarge 39.33 KB