Spent 3 hours chasing a draft issue in a 1920s flue before I realized the cleanout door was sitting open a quarter inch

Took me way too long to check something that simple, has anyone else had a dumb blind spot like that on an old chimney job?

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stella_roberts7h ago

After a similar hunt on a 1900s coal-to-gas conversion, I finally taped a bright orange tag to the flue damper handle that says "CHECK CLEANOUT DOOR FIRST." It's saved me at least two repeat headaches since then.