bobcook39...@hotmail.com <bobcook39...@hotmail.com> wrote: Did your old furnace have a closed combustion system with a separate > fresh air pipe and combustion gas exhaust? >
They all do, as far as I know. I don't recall the model and it is now out the door. The new one is a Trane S8B1: https://www.trane.com/residential/en/products/gas-furnaces/s8b1/ They all have a heat exchanger. Air in the house circulates through the exchanger. I think CO usually enters the house when the exchanger cracks or develops a hole, and combustion gas mixes with the fresh air supply. Perhaps, as you suggest, this was a leak from the flue. The equipment was 16 years old and I did not want to take a chance with a partial repair. In my experience, trying to patch up old equipment is a mistake. > I hope your mew finance does. That exhaust pipe SHOULD NOT LEAK. If it > leaks a new furnaced may not resolve CO accumulation. > They replaced the flue up to the chimney, and some of the ducts. The old flue and ducts were a mess. Maybe coulda been a leak there . . . I suppose it would have cost a lot to have the flue fixed, and the problem might have been in the heat exchanger. This kind of equipment is rated to last 15 to 20 years, so it was close to end of life. The maintenance company recommends replacing rather than repairing after 10 years. That could be self-serving.
