The first reason: after the heating door is closed after the moxa cake is ignited, the gear should be quickly adjusted to the sixth gear to make the moxa cake burn continuously and rapidly. After the combustion is stable, it should be downshifted according to the thermal adaptability of the body surface until the appropriate temperature is the best.

The second reason: everyone's perception of temperature is different, and different gears need to be adjusted. If it is overheated, it will go up one gear, and if it is overheated, it will go down one gear.