Ventilation of a private house – an important point during construction or major repairs, aimed at ensuring high-quality air exchange and creating a favorable microclimate where we spend a lot of time. It has been scientifically proven that poor ventilation contributes not only to the appearance of mold and unpleasant odor in the house, but also to the deterioration of the well-being of household members. The lack of fresh air leads to rapid fatigue, exacerbation of allergic and cardiovascular diseases, cerebrovascular accidents and other problems. That is why it is so important to think about creating a ventilation system in advance.