BKVP
Minister of Fire
The trim ring “closes” the gap between the outer can and where the steel flue collar protrudes through the can. I think it’s about 1” in diameter. There is a cavity all around the firebox, encased by the outer can. This is where air is heated and moved by fans into the room.
If debris from the masonry chimney fell down on top of the firebox, dropped into that opening, it could lay in the bottom of the can. Then burning stove could get it hot and blowers come on, out it comes. It’s a long shot, but so is the situation you’re having.
This could happen because when it was installed and “if” a liner was connected, they did not reattach trim ring. The trim ring is installed at the factory, but who knows, it could have been removed.
If debris from the masonry chimney fell down on top of the firebox, dropped into that opening, it could lay in the bottom of the can. Then burning stove could get it hot and blowers come on, out it comes. It’s a long shot, but so is the situation you’re having.
This could happen because when it was installed and “if” a liner was connected, they did not reattach trim ring. The trim ring is installed at the factory, but who knows, it could have been removed.