Literally every heating system, which is based on the principle of burning a certain type of fuel, needs to withdraw various kinds of products obtained during the operation of the system. The final point of air with various impurities — chimneys. That is why, a very important point in housing construction is a design of the chimney. And this is not surprising, because it directly depends on what heat output will be produced, how much heat will go into the surrounding atmosphere, how much fuel will consume the entire system, as well as an not unimportant factor, namely, the purity of air in the inverted building.