So that there is good traction in the chimney so that its walls are even and smooth, as well as the walls of the wall impatient for the air mass. For the formation of natural traction, the height of the fireplace should be six meters. The structure must be selected with a round section, as it meets the specified requirements to the surface of the chimney. Когда установлены прямоугольные или квадратные дымоходы, то в самих углах будет появляться турбулентность и завихрения. If the chimney has a knee, then you need to install a tee, since soot and dust will accumulate in such a place.