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MidnightAdventurer t1_iucjvwd wrote

Reply to comment by thecosmicradiation in Is it safe to plug my fireplace? by thecosmicradiation

Condensation seems unlikely to be a significant issue. The only major issue I can see is if rain gets in the top of the chimney and you get a whole lot of water in there. Whether or not this is possible very much depends on what the top looks like
Is it safe for you to access the top of the chimney and put a cap over it or otherwise block it from the outside?

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