We bought this ~55 y.o. house a couple of years ago. It came with brick fireplace.
Last night I peered up flue to open it to start a fire. I noticed what appeared to be a thermocouple going to the right side of the chimney.
On the left and right side of the fireplace there is a vent near the floor and one a couple of feet higher. I removed the covers to see if there was any motor in there - which there wasn't. Firebox is metal and there is a gap of at least an inch between firebox and more bricks.
Anyone have any ideas what that thermocouple could control? Or what it might have gone too? I see no power going into the fireplace from the basement. Previous owner blew out a town to unknown place. So I cannot ask him. And the owners before them are deceased.
TIA.