Very often an unpleasant odor, dampness, plug in the rooms provoke the appearance of rapid fatigue, poor sleep and various diseases in people living in such an apartment. The reason for this is the construction of houses in such a way that the required volume of fresh air should enter through the cracks in the walls, doors and windows, and the air will be removed through the hood. Therefore, when plastic windows appear on the market, modern entrance doors and insulation of the walls of the house, they lost the necessary influx of fresh air, which can now get into the apartment, only when opening windows or doors. By the method of encouraging air flow, ventilation can be: – natural; – Mechanical. By the method of air exchange: – general exchange; – local; – anti -drum; – emergency. Natural ventilation is carried out by ventilation of the apartment, opening windows and doors. Mechanical ventilation is carried out using artificial supply and removal of air with fans. For mechanical ventilation, some rooms are equipped with fans and ventilation shafts, which remove air, oversaturated with carbon dioxide, and deliver a cleaned. Natural ventilation can be arranged due to window ventilators. They have small size and are installed in the frame of the metal -plastic window. In order to start ventilation, you just need to open the damper. But at the same time, experts believe that if there is only one window and a closed door in the room, then this ventilation is practically ineffective. General ventilation, as a rule, is installed in a wall or ceiling. It is best to cover ventilation shafts with wall panels or hide under a hinged ceiling, so the interior will remain unspoiled. The main equipment for exchange ventilation is mounted in the attic. Local ventilation is characteristic of the apartments of old houses in which more or less ventilated rooms are a kitchen and bathroom. In a private house there is the possibility of installing local supply and exhaust ventilation. It is based on the fact that the air is supplied and removed to a certain area. Anti -drum and emergency ventilation are used exclusively in production. In apartments, these functions are assigned to the kitchen hood. Almost all new ventilation systems are equipped with electronic sensors, and automatically select the operating mode. These systems are also driven using mechanical switches that work in pairs with a light switch.