By placing the fire and chimney on opposite sides of the house and constructing a tunnel between them, heat is pulled through the tunnel, heating the floors and helping distribute heat more evenly.
this post was submitted on 07 Oct 2023
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It's not totally clear from the diagram, but I think the fire pit itself is outside the house. The air naturally ducts underneath the floor of the house and then up the chimney in the back. There's still a chimney effect, but it gets redirected under the floor first.