Element for providing an air exchange between the internal microenvironment and the external environment

An element for facilitating the exchange of air between an internal micro-environment and an external environment, as well as for anti-insect protection, the element comprising:

• a substantially flat part with at least one air inlet opening and a substantially curved part with at least one air outlet which is not coaxial with the at least one air inlet opening of the flat part;
• wherein the shape of the inner surface of the curved part consists of torus surface segment obtained by an intersection of a horizontal cross-section of a torus and a vertical circular cross-section of the torus parallel to the centroidal axis of the torus, the torus surface segment being only a partial surface of the torus;
• wherein the curved part is connected to the flat part so that all the air inlet openings of the flat part are covered by a wall of the torus surface segment of the curved part and are in communication, with an air exchange possibility, with outlet or outlets of the curved part.