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Hello !
I made a solar air heater, a typical low-tech technology for heating homes.
Have a nice day,
I added the infographics and the download link to the Low-Tech Lab tutorial : https://wiki.lowtechlab.org/wiki/Chauffage_solaire_version_ardoise#%C3%89tape_19_-_Mod%C3%A8le_3D_%C3%A0_t%C3%A9l%C3%A9charger
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