This is smokeless chulha/stove made at a permaculture farm near Pune, India.
It's easy to make and very efficient. There are plenty of different types of smokeless stove designs are available on internet. This is the simplest one where smoke outlet is different from fire outlet.
I wish more and more people build it in their home in rural India.
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STOPTo support your work, I also upvoted your post!