RE: Free Retort Makes the Cleanest Biochar

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Free Retort Makes the Cleanest Biochar

in biochar •  7 years ago 

The reason for the lid is that you don't want a lot of oxygen. Otherwise the material will continue to burn and turn into ash.
It's not always easy or necessary to direct the gases downward but if the gases/smoke don't ignite, it doesn't feed the fire and just makes it more smoky. With a big fire it's not really a problem.

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Thanks for that info.. I am now more informed about making biochar!