An exhaust air blow-out device adapted for mounting to the outer wall (W) of a building, the exhaust air blow-out device comprising - a connector collar , the connector collar having a circular cross-section and an inner surface having an inner first diameter (D 1 ), the connector collar being connectable to an exhaust air channel of a mechanical house ventilation system to form a part of the exhaust air channel, and - a throttling device , the throttling device being arranged inside the connector collar for increasing blow-out rate of the exhaust air, characterized in that the throttling device comprises a nose cone element having an outer contour with aerodynamic shape of a nose cone, the nose cone element being arranged concentrically inside the connector collar , the nose cone element comprising a tip (T) directed towards the exhaust air flow and a circular trailing edge (8; 8 1 , 8 2 , 8 3 , 8 4 , 8 5 ) having a second diameter (D 2-1 - D 2-6 ) smaller than the first diameter (D 1 ) defining a circular blow-out gap between the inner surface of the connector collar and the trailing edge of the nose cone element the exhaust air being blown out via said circular gap forming a throttling means the second diameter (D 2-1 - D 2-6 ) defining the throttling rate; and that the nose cone element comprises a tip section and a set (S) of adjusting sections connectable successively with the tip section to form an assembly forming the nose cone element having a desired second diameter (D 2-1 - D 2-6 ) of the trailing edge , each of the adjusting sections having an outer contour being a part of said nose cone shape and having gradually increasing second diameters (D 2-1 - D 2-6 ) of the trailing edges, so that the number of adjusting sections can be varied for adjusting the exhaust air blow-out rate by adjusting the face area of the blow-out gap . - a connector collar , the connector collar having a circular cross-section and an inner surface having an inner first diameter (D 1 ), the connector collar being connectable to an exhaust air channel of a mechanical house ventilation system to form a part of the exhaust air channel, and - a throttling device , the throttling device being arranged inside the connector collar for increasing blow-out rate of the exhaust air, characterized in that the throttling device comprises a nose cone element having an outer contour with aerodynamic shape of a nose cone, the nose cone element being arranged concentrically inside the connector collar , the nose cone element comprising a tip (T) directed towards the exhaust air flow and a circular trailing edge (8; 8 1 , 8 2 , 8 3 , 8 4 , 8 5 ) having a second diameter (D 2-1 - D 2-6 ) smaller than the first diameter (D 1 ) defining a circular blow-out gap between the inner surface of the connector collar and the trailing edge of the nose cone element the exhaust air being blown out via said circular gap forming a throttling means the second diameter (D 2-1 - D 2-6 ) defining the throttling rate; and that the nose cone element comprises a tip section and a set (S) of adjusting sections connectable successively with the tip section to form an assembly forming the nose cone element having a desired second diameter (D 2-1 - D 2-6 ) of the trailing edge , each of the adjusting sections having an outer contour being a part of said nose cone shape and having gradually increasing second diameters (D 2-1 - D 2-6 ) of the trailing edges, so that the number of adjusting sections can be varied for adjusting the exhaust air blow-out rate by adjusting the face area of the blow-out gap . <EOS>