I dug my basement out and noticed an 18 inch wide rectangular trough that ran from the side wall to the center of the house. The trough had ashes in it. The trough led the center of the home to a brick well looking structure.
I stuck my shovel down the middle of the well like structure and I pulled out this ash like material on my shovel. My house was built in 1900 and I can see two 1 ft/1.5 ft rectangular holes in the floors. Looks like an old vent or duct was there.
The same situation with the room above. In the basement I noticed there was sheet metal stuck on my floor joist beams that looked like they were there to protect from getting burned.
Did I have a gravity furnace at one point? What was the trough used for? I noticed ashes inside of it and they lead to the well like structure.
This is important because I would like to take the trough out and cement my basement.