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Troubles extending a stove

A few days have passed since in my previous post I shared my idea of Extending a stove by inserting some metal cylinder, adapted can or folded sheet, between the mouth piece and the bottom of an already made stove.
The purpose would be quite positive but I must admit that the application has been not completely satisfactory up until now. The main issue is not getting a complete process as some of the biomass on the bottom of the stove fails to become biochar.

This is almost for sure due to the fact that the joints between the three pieces (bottom, extension, top mouth piece) are definitely not air-tight. Other practical solutions rather than the very basic ones that I tried to apply are not easy to perform at this early stage of development.
I feel it's important to share ideas but also "not-completely-positive" results as somebody's failures or just experiences may be crucial information for others to avoid trouble.

Anyway the rice was nicely cooked and the biochar production was perfect in the other 80% of the biomass load. It's been worth all the efforts, now I will have to proceed in a different way... 

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