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5kyl3r t1_it9bi6h wrote

possibly fireplace chimney void? I have a 1st floor fireplace but I have a void that goes down to the basement foundation and up to the roof. like big enough to fit a few people inside

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NoMuffinForYou OP t1_it9h6r9 wrote

That's my second-best guess. There is a fireplace on the second floor above it and maybe they share a chimney? Don't know why they'd drywall over it though

2