I have an unusual dimension chimney with an oversized opening compaired to what I've seen in others. It's a wood burner. 59 yrs. old. The damper rusted out so I've been looking for solutions.
Heaterman mentioned the importance of having a certified chimney sweep evaluate the whole fireplace. He said he recommended replacing the damper but it would be a big job, removing alot of brick etc. Asked him about a Lock top instead and he said they don't make them close to that size and a custom one with installation would be more than replacing the damper.
Called a second guy who I don't believe have any certification. He suggested that the cap be rebuilt to fit a standard sized Lock Top. Sounded interesting to me but when asking him about how he would rebuild it, he said he would put plywood over the opening and brick that or something. Once he said wood my brain went into overdrive trying to figure out how this would work.
My question is: How do you determine the size of the chimney opening and is there a way to rebuild it to a more narrow size?
Thanks for any responses.