brick fireplace conversion
You need to consult an architect/landscape architect, fireplace or chimney expert, or a mason---or all three. What you have in mind is extremely dangerous, will not pass code, and will invalidate your fire insurance policy instantly. As mentioned, you (hopefully) have a firebox designed to draft fire properly. It will not work backwards.
You are probably better off designing and building a new fire feature element, with its own chimney, from scratch in your outdoor living area?
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Last edited by sdsester; 01-30-2012 at 09:35 AM.