The main should

Warm air rises up, and the floor of the room remains cold. Drafts break through. That is why in the Russian hut and the bath always made a high threshold, which was supposed to stop the flow of cold air. It turns out that the heat from the stove flies into the pipe with smoke, diverges under the ceiling, but spreads for a long time around the room. It is hot next to the stove, in the distance — cool, in the next room it is cold … The same problems arise when heating with a fireplace, which, like the furnace, is good as an additional heat source. The main should provide uniform heating of all rooms.