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    True Heat TH36PA Fireplace 8" ID x 14" OD chimney extension

    I am wanting to add a section of chimney to my existing roofstack. This is my parents house that was built in the mid 80s. The fireplace has a label Dhat shows this to be a TrueHeat TH36PA zero clearance fireplace. The manuals I found online call for duct pipe that is 8 inches innner diameter...