the air which is sucked into the feed tube had to be unrestricted on the side of the burn tunnel. In other words, letting the fuel lean to the burn tunnel side resulted in a dirty burn, letting it lean to the other side it did clear up again. All according to the Testo 330-2 gas analyzer. In order to minimize the chance of going the wrong way I've mounted a plate in the feed tube, leaving approximately a gap of 1/4" which can't be filled with fuel at all.
Gagan Bansal wrote:Cob wall of riser are 3 inches thick, hope that's quite a good insulation.
Gagan Bansal wrote:Thank you @GerryParent for your feedback. Regarding the ash after long duration burn, now I have one doubt on my question itself. If the burning is efficient then the ash content should be very minimal. I think my burning of wood was not efficient and that resulted in unburnt wood (looks like tiny pieces of coal and ash). Any comment on this.