Device for separating two zones with different environment

Device (100) for separating first and second zones (10, 20) in which different environments prevail, characterized in that it comprises:

• a buffer zone (110) which extends along a longitudinal axis X between the first and second zones (10, 20) and which communicates via an inlet (111) with the first zone (10) and via an outlet (112) with the second zone (20) and which is delimited by two vertical walls (110a) facing each other, which extend along the axis X, comprising perforated sheets,
• blowing means capable of blowing clean, sterile air into the said buffer zone (110) through the said perforations (110a') in the said vertical walls (110a), and
• air-injection means (120, 120a) opening in the region of the inlet (111) of the buffer zone (110) and capable of injecting, on each side of the said longitudinal axis X, toward the outlet (112) of the said buffer zone (110), two jets (121, 122) of clean air at high speed in oblique directions (Y1, Y2) with respect to the axis X, which cross each other in a region located between the inlet (111) and the central region (113) of the said buffer zone (110), so as to form an impassable barrier which separates the said first zone (10) from the second zone (20).