Sometimes you need

In order to change in the fireplace, the intensity of heating is just enough to put in a smaller amount of firewood in the fuel furnace. Even if all firewood burn out in the stove and only coals remain, then the firebox and chimney will maintain heat for some time and give it to the room. Sometimes you need to adjust the air supply to the furnace. To do this, open or close the damper. If this is a more expensive and modern model of the fireplace, then they have automatic regulators, you only need to put the necessary parameters and the equipment itself will control the damper.