William Bronson wrote:
Most of those that do seem to use a lid that concentrates(funnels) the woodgas(the flame concentrate Su described) and a chimney to provide draft.
The funnel is like both of these together ,and it should draw air through the secondary air holes.
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September-October Homestead Skills Jamboree 2019https://permies.com/wiki/118704/permaculture-projects/September-October-Homestead-Skills-Jamboree