An air curtain generating device for generating air curtains along a plane defining an inside zone and an outside zone, comprising air curtain generating means (22, 28) including air curtain diffusion means (24, 32), able to diffuse at least one air curtain (26, 30) along said plane, in at least first and second separate diffusion directions, the air curtain generating device including a control unit able to control the diffusion of at least one air curtain (26, 30) in one and/or the other of the first and second diffusion directions, characterized in that: - the control unit is able to regulate a flow of each air curtain (26, 30), and - the air curtain generating device includes detection means for detecting people near said plane, the control unit being configured to adjust the flow of the at least one air curtain (26, 30) based on the presence and/or movements of people near said plane, - the air curtain generating device includes first air curtain generating means for generating a first air curtain, comprising first air curtain diffusion means diffusing the first air curtain along said plane, in the first diffusion direction, and - the air curtain generating device includes second air curtain generation means for generating a second air curtain, comprising second air curtain diffusion means diffusing the second air curtain, along said plane, in the second diffusion direction, - the control unit is able to control the diffusion of the first air curtain and the second air curtain, the control unit bein able to enter a first operating mode, in which the flow of the first air curtain is increased and/or the flow of the second air curtain is reduced to favor the movement of people from the outside zone toward the inside zone, or in a second operating mode, wherein the flow of the first air curtain is reduced and/or the flow of the second air curtain is increased to favor the movement of people from the inside zone toward the outside zone. - the control unit is able to regulate a flow of each air curtain (26, 30), and - the air curtain generating device includes detection means for detecting people near said plane, the control unit being configured to adjust the flow of the at least one air curtain (26, 30) based on the presence and/or movements of people near said plane, - the air curtain generating device includes first air curtain generating means for generating a first air curtain, comprising first air curtain diffusion means diffusing the first air curtain along said plane, in the first diffusion direction, and - the air curtain generating device includes second air curtain generation means for generating a second air curtain, comprising second air curtain diffusion means diffusing the second air curtain, along said plane, in the second diffusion direction, - the control unit is able to control the diffusion of the first air curtain and the second air curtain, the control unit bein able to enter a first operating mode, in which the flow of the first air curtain is increased and/or the flow of the second air curtain is reduced to favor the movement of people from the outside zone toward the inside zone, or in a second operating mode, wherein the flow of the first air curtain is reduced and/or the flow of the second air curtain is increased to favor the movement of people from the inside zone toward the outside zone.