But there are other ways to improve the quality of the chimney in a multi -storey building and eliminate the reasons, as a result of which the reverse traction is formed. This is an increase in the diameter of the pipe for the chimney, cleaning it from soot, transferring the chimney, as well as improving the supply ventilation in the apartment. You can also install coaxial chimneys, the design of which involves air fence directly from the atmosphere.