It's annoying that they used a stupid ai generated diagram for how the bed works which is simply WRONG.
The illustration from the article:
click to see ai slop
The duct under the bed doesn't go anywhere, it's not connected to the chimney either.
With a quick 2 second search I could find very basic but clear diagrams which shows how actually this bed works, the search term was "kang bed diagram":
Another drawing:
People forgot how to think and search? Or the author doesn't know how these beds work?
Now, as a researcher in architecture and construction at a British university
I assume the author is a trained architect he should know how to draw, and recreating a diagram like this in a CAD program is like a couple of minutes work, if he can't use other people's work for some reason.