Automatic and manual air vents are used to remove air from the heating medium, which appeared as a result of filling the installation and as a result of the liquid evaporation process in the process of heating the working medium in the boiler or heat exchanger, as well as gases generated in the installation. Depending on the amount of gas discharged from the installation, air vents are intended for venting risers, manifolds or radiators. Air separators are used for preliminary deaeration of the central heating installation in the substation or boiler room. They are mounted after the heat source (boiler, heat exchanger) and before of the manifold.