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I am damn near positive they sell flue (spelling) adapters to drop into exsisting chimneys to make them into a two flue system.
I also do know it has been done a lot in the past with chimneys sharing chimneys. Often you will find people bitching about smoke coming in on a second floor when another floor is lit etc. Caused by this very situation and often corrected by adding about a 12-16 inch extension. Though I am not a contractor nor do I know your local zoning and building codes.
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