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Third stage - after 2 or 3 hours the temperature is high enough for the charcoal timber to give off wood gases which are combustible and are vented into the fire box. At this stage it becomes self sustaining and no more wood needs to be added

Third stage – after 2 or 3 hours the temperature is high enough for the charcoal timber to give off wood gases which are combustible and are vented into the fire box. At this stage it becomes self sustaining and no more wood needs to be added