The author, Gary Gilmore, explains how he designed a charcoal retort from 55 gallon drums. This is a smoke free design also the flare could be put to use.

Water Heater to Prototype Small Charcoal Retort.
Mark A. Gallmeier December 10, 2006

Water Heater Tank - Charcoal RetortWater Heater Tank - Charcoal Retort
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