There are horizontal ducts that carry the exhaust through the bench mass before turning up and out. They can be long and winding.
paul wheaton wrote:... hauling in lots and lots of rocks and stacking them around his wood stove.
Or we might never have existed at all. Freaky. So we should cherish everything. Even this tiny ad:
"Permaculture Now! - Desert or Paradise?" movie by Sepp Holzerhttps://permies.com/wiki/137395/Permaculture-Desert-Paradise-movie-Sepp