Thank you for the kind words Kristjan.
Steve, here we have said something on this topic Properties of a good wood gasifier - #390 by Tone.
Otherwise, I think it is best to preheat the air with hot gas and radiation from the reduction zone, because this way we preheat the fresh air, do not cool the hot cone, keep the grille at a not too high temperature, which acts as a heat exchanger. If you think of a gas burner with which you heat the sheet metal, if you move it a little further away, the sheet metal will never glow.
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