Smokeless Kilns

Kusakabe

The kiln design approach seems to be an efficient Bourry Box grate coupled with a tall chimney.
Kiln dimensions (from book?)
Kiln building in Germany
German firing results

Engels

Wood and charcoal designs
https://www.studio-engels.com

Girel

High efficiency French design
At La Borne https://www.laborne.org/en/le_four_girel_au_ccclb-2/

Sheehan design built by Loren Scherback

Kiln design seems very similar to Kusakabe. Lots of info in the drawings and sketches.
Building and firing the kiln

Claycraft thread

Link

Firing Efficiency

But also smoke is inefficient firing, and isn't required for reduction - see also the presentation by Engels at the wood firing conference in La Borne.
Smoke gets in your eyes - John Baymore

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