Mixer for use in an air conditioning assembly of a rail vehicle, - in which the mixer comprises a first inlet, a second inlet, an outlet (All) and a central area, which is arranged between the two inlets (E11, E12) and the outlet, - in which the first inlet (Ell) can be connected to a fresh air supply, so that fresh air reaches the central area via the first inlet, - in which the second inlet can be connected to a circulating air supply, so that circulating air reaches the central area via the second inlet, - wherein in the central area the circulating air delivered and fresh air are mixed to generate supply air, which passes to the outlet (All) of the mixer, - in which the central area of the mixer is connected via an opening to the first inlet (Ell) and the opening forms a transitional area between the inlet (Ell) and the central area, so that the fresh air delivered is fed from the first inlet (Ell) to the central area via the transitional area, - in which the transitional area contains a profile having an airfoil-shaped cross section, - in which the profile is arranged in the transitional area in such a way that the fresh air delivered generates a negative pressure along the transitional area which boosts the induction of the circulating air into the central area of the mixer, characterized in that - the central area of the mixer is cylindrical, - the first inlet (Ell) of the mixer is formed as a tube, - the tube is arranged radially to the circumference on the outside of the mixer, - the tube comprises the opening which opens radially to the circumference in the direction of the central area and in the direction towards the interior of the mixer and which forms the circumferential transitional area, which is arranged between the inlet (Ell) and the cylindrical central area. - in which the mixer comprises a first inlet, a second inlet, an outlet (All) and a central area, which is arranged between the two inlets (E11, E12) and the outlet, - in which the first inlet (Ell) can be connected to a fresh air supply, so that fresh air reaches the central area via the first inlet, - in which the second inlet can be connected to a circulating air supply, so that circulating air reaches the central area via the second inlet, - wherein in the central area the circulating air delivered and fresh air are mixed to generate supply air, which passes to the outlet (All) of the mixer, - in which the central area of the mixer is connected via an opening to the first inlet (Ell) and the opening forms a transitional area between the inlet (Ell) and the central area, so that the fresh air delivered is fed from the first inlet (Ell) to the central area via the transitional area, - in which the transitional area contains a profile having an airfoil-shaped cross section, - in which the profile is arranged in the transitional area in such a way that the fresh air delivered generates a negative pressure along the transitional area which boosts the induction of the circulating air into the central area of the mixer, characterized in that - the central area of the mixer is cylindrical, - the first inlet (Ell) of the mixer is formed as a tube, - the tube is arranged radially to the circumference on the outside of the mixer, - the tube comprises the opening which opens radially to the circumference in the direction of the central area and in the direction towards the interior of the mixer and which forms the circumferential transitional area, which is arranged between the inlet (Ell) and the cylindrical central area.