Ventilation is essential to maintain good indoor air quality. Ventilation is typically used in a variety of rooms to manage air quality and drive out pollutants, as well as provide thermal comfort or dehumidification, in which case the introduction of outside air will help achieve the desired conditions.
The deliberate introduction of outside air can provide continuous ventilation regardless of the weather, and without the need to open doors and windows, but for this the ventilation system must be properly installed. An important role in ventilation systems is played by a check valve for ventilation which prevents the air from flowing in the opposite direction.
The check valve is opened by the air flow and automatically closes by means of a spring when the ventilation system is off. At the same time, the non-return valve prevents insects, dust and dirt from entering the building from the street and into the ventilation duct, which disrupt the operation of the ventilation system. One of the important functions of the valve is to prevent the influx of foreign odors into the premises, especially into the residential ones.
Ventilation systems should not be confused with air movement caused by conventional ventilators or other devices. They affect the movement of air, creating thermal comfort, but they do not displace pollution and therefore do not qualify as ventilation. There are three ways that can be used to ventilate rooms and buildings: natural, mechanical and hybrid ventilation.
Natural ventilation is based on the use of wind and temperature extremes, creating air currents inside buildings. A mechanical ventilation system supplies the required air flow at a constant speed. Ventilation provides air forcing through the ducts using a fan. Hybrid ventilation combines natural and mechanical ventilation. It is used to increase the intensity of ventilation, when natural ventilation alone is not enough, then exhaust fans are installed.
