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I just came across this design for a biochar kiln from Thailand that produces both biochar and wood vinegar. The article specifies that the source of heat is external, and it's designed to sit on top of it. I wonder, could this become one of the modules for this modular design?

 
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The rocket engine, rocket hot tub and rocket kiln are featured in the Low Tech Lab movie (the orginal). Take a peak:


 
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