The main task of the ventilation system in any room is to ensure uninterrupted circulation of air masses, to remove dirty air from the room. Like everything created in this world by human hands, ventilation may not function properly. The most common problem was and still is reverse air draft. This happens for one of several reasons.
Why does the air pull back
First of all, the appearance of the reverse draft of ventilation is affected by the tightness of the room. Modern plastic windows, which very often violate the idea of natural circulation of "exhaust-window" air in the apartment, have a negative effect on it. This happens due to the fact that plastic windows do not help to remove warm air from the room. They are very useful for saving heat, but not very good for ventilation. The result of this can be a reverse movement of air into the room. Dust and debris from the ventilation will fly along with it.
Another common cause of back draft is inadequate ventilation cross-sectional dimensions. This problem appears solely due to mistakes made in the design of the house. This problem is widespread in private homes.
In addition to the two "big" reasons, there are many more rare and minor ones. These include improper operation of the exhaust system or fan, ingress of foreign objects (including soot, snow, debris) into the ventilation duct, and specific wind.
What to do
In the first place, it is best to call in an expert for an assessment when ventilation problems arise. Of course, such a service is paid, but it will allow you to identify and eliminate all problems as soon as possible. Experts will give recommendations on further actions. In addition, you can immediately resort to the help of a wizard, who, as quickly and efficiently as possible, will eliminate all ventilation problems. If the owner is confident in his abilities, he can try to solve the problem himself.
If ventilation problems are due to the tightness of the room, then the best (and easiest) thing to do is to install a supply valve on the window. This device guarantees the supply of fresh air even when all windows and doors are tightly closed. Valve models are also available for wall mounting.
If the ventilation channel is corny, it will have to be cleaned. It is possible to clean the ventilation on your own only in your own house, since only in this case the owner has unlimited access to the mines. In an apartment building, you will have to call a special master. Of course, the channels close to the grate can be cleaned with a vacuum cleaner, but this does not always help.
In all other cases, it will not be possible to do without the help of specially trained people, especially when it comes to a city apartment building. For example, it will definitely not work to eliminate the violation of the ventilation system due to the redevelopment of neighbors.
Continuing the topic 6 design features of the Soviet "Khrushchev": absurdity or clear calculation and not only.