Fuel continues to be added into the firebox and chamber temperature is monitored to ensure it’s rising at the correct rate. As temperature continues to rise, the wood trapped inside the chambers starts to give off woodgas which is diverted back into the firebox, which then ignites, providing it’s own energy to continue the conversion process.
After 24 hours, the doors to Idris are opened and pure charcoal is harvested for the bagging process. As you can see, there’s a lot less in there than the day before..! It's about a 4:1 reduction ratio.