The wall vent is an air handling unit designed for creation of a continuous air exchange and supply of fresh air to residential and non-residential premises. PSS is a cost-efficient and autonomous device for more intensive air exchange as compared to passive airing. The vent PSS allows bringing fresh air inside without opening the windows and thus without letting the dust, street noise and plant pollen enter the room. Specially developed design of inner grille, as well as the device for controlling the open cross-section of the inflow, provide for a steady inflow and uniform distribution of fresh air in the room. The vent is installed on the sunny side of the outer wall of an apartment, cottage, office building, etc.