The main feature of such windows — tightness — is at the same time a negative characteristic. Tightness of structures is the reason for an increase in air humidity in the room. And since the ventilation is very small, disputes of mushrooms and pathogenic microbes are actively propagated in the apartment. Plastic window border the intake of fresh clean air and increase the concentration of dust. This leads to an increase in the number of people suffering from allergies, asthma, skin diseases and headaches.