Does anyone know what this strange cover is, sticking out of the wall from the chimney? 100 year old house. What can we do with this? Want to remove it somehow, but not have toxic exhaust fumes fill the house!
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It's most likely a thimble cover (aka "flue stopper") that's not properly seated. It is not intended to be "a vent" and it should be pushed in to seat against the wall, or replaced if that's not possible.
Image Source, no endorsement implied
Image source, no endorsement implied
Those go into a thimble (stovepipe hole into the chimney) that is not being used. They should be flush to the wall surface. Looks rather like a metal pie plate with a spring on the side that goes into the hole to hold it in place. They just push in or pull out. This one seems to have many coats of paint slopped on it.
Ecnerwal
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