Spray head (1, 11) comprising a jacket (2, 12) and at least one nozzle (3, 4, 5, 6, 13, 14, 15, 16, 13', 14', 15', 16'), said jacket (2, 12) comprising at least one pipe (7, 17) for connecting said at least one nozzle (3-6, 13-16, 13'-16') to a pressurised water supply, said at least one nozzle (3-6, 13-16, 13'-16') being configured to spray pressurised water into the surrounding air, said spray head (1, 11) comprising a through opening (8, 18) and a ventilation device (9, 19) configured to circulate the surrounding air through said through opening (8, 18) according to a direction of circulation D1 between an upstream orifice (27, 37) and a downstream orifice (22, 32) of said through opening (8, 18), said at least one nozzle (3-6, 13-16, 13'-16') being arranged on the side of said downstream orifice (22, 32) of said through opening (8, 18) to allow said sprayed pressurised water to be entrained by a flow of surrounding air expelled from said downstream orifice (22, 32), said ventilation device (9, 19) having an annular slot (20, 30) configured to be connected to a pressurised air supply and to generate a flow of pressurised air in said through opening (8, 18), said annular slot (20, 30) being delimited circumferentially by an upstream edge (29, 39) arranged on an upstream side of said annular slot (20, 30) and by a downstream edge (21, 31) arranged on a downstream side of said annular slot (20, 30), said upstream side and said downstream side being respectively defined according to said direction of circulation D1 of the surrounding air in said through opening (8, 18), said downstream edge (21, 31) having a convex shape, characterised in that said spray head (1, 11) comprises a first stage (101, 111) of at least two nozzles and a second stage (102, 112) of at least two nozzles, said spray head (1, 11) having a longitudinal direction D2, said through opening (8, 18) being arranged between said first stage (101, 111) and said second stage (102, 112) in said longitudinal direction D2, each of said at least two nozzles of said first stage (101, 111) being arranged above said through opening (8, 18) according to said longitudinal direction D2 and each of said at least two nozzles of said second stage (102, 112) being arranged below said through opening (8, 18) according to said longitudinal direction D2. said spray head (1, 11) comprising a through opening (8, 18) and a ventilation device (9, 19) configured to circulate the surrounding air through said through opening (8, 18) according to a direction of circulation D1 between an upstream orifice (27, 37) and a downstream orifice (22, 32) of said through opening (8, 18), said at least one nozzle (3-6, 13-16, 13'-16') being arranged on the side of said downstream orifice (22, 32) of said through opening (8, 18) to allow said sprayed pressurised water to be entrained by a flow of surrounding air expelled from said downstream orifice (22, 32), said ventilation device (9, 19) having an annular slot (20, 30) configured to be connected to a pressurised air supply and to generate a flow of pressurised air in said through opening (8, 18), said annular slot (20, 30) being delimited circumferentially by an upstream edge (29, 39) arranged on an upstream side of said annular slot (20, 30) and by a downstream edge (21, 31) arranged on a downstream side of said annular slot (20, 30), said upstream side and said downstream side being respectively defined according to said direction of circulation D1 of the surrounding air in said through opening (8, 18), said downstream edge (21, 31) having a convex shape, characterised in that said spray head (1, 11) comprises a first stage (101, 111) of at least two nozzles and a second stage (102, 112) of at least two nozzles, said spray head (1, 11) having a longitudinal direction D2, said through opening (8, 18) being arranged between said first stage (101, 111) and said second stage (102, 112) in said longitudinal direction D2, each of said at least two nozzles of said first stage (101, 111) being arranged above said through opening (8, 18) according to said longitudinal direction D2 and each of said at least two nozzles of said second stage (102, 112) being arranged below said through opening (8, 18) according to said longitudinal direction D2.