Ditto what Ofos said. My brother had this same kind of furnace chimney removed from the middle of his home and converted it to a laundry chute (since it went to the basement where the W/D are). I believe it was a bit tricky removing the bricks, but it is doable. And its very cool.
The other thing I will point out is that a lot of time, these spaces in older homes get used as a chase to run wires, telephone lines or even a vent for additional bathrooms – things added over time. You would want to make sure there is none of that business is going on before removing.


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