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.
Retort
CHARCOAL (how to make charcoal in a drum)
Submitted by Jeff Davis on January 26, 2008 - 23:24.Water Heater Tank - Charcoal Retort
Submitted by Tom Miles on December 10, 2006 - 20:58.
