installing new setup through wall. Need the old overhang question advice!

Ok, so first off, I'm running the black stove pipe throughout my setup except the through wall which is a class A pipe through a thimble. When maintained, I have no troubles getting the place warm and keeping it warm for days. For long term I've been picking up some chimney pipe as I do have

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installing new setup through wall. Need the old overhang question

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