The occurrence of reverse traction can be due to insufficient height of the chimney, a small diameter, a large number of curbs of the chimney for the fireplace and the irregularities of the internal walls, the wrong installation relative to the roof skate, and the presence of high -rise buildings. The absence of supply ventilation in modern apartments of multi -storey buildings also has a great influence, in which, as a rule, metal -plastic windows and doors are installed.