Thanks for the input. To clarify, I have a relatively old furnace (15 years). It's definitely not a high efficiency. The chimney isn't lined with metal, but does have a clay liner. Also, one other thing I did was to install a new water heater that vents into the same area. Jim, I don't know why the recess is there. I have a natural gas furnace, but the house was built in 1929, so who know the history of how it was heated along the way. It does have a coal chute.
As soon as the snow melts this weekend, I'm going to pull that cap off and see what happens.
|