Spray head comprising a jacket and at least one nozzle , said jacket comprising at least one pipe 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 comprising a through opening and a ventilation device configured to circulate the surrounding air through said through opening according to a direction of circulation D1 between an upstream orifice and a downstream orifice of said through opening , said at least one nozzle (3-6, 13-16, 13'-16') being arranged on the side of said downstream orifice of said through opening to allow said sprayed pressurised water to be entrained by a flow of surrounding air expelled from said downstream orifice , said ventilation device having an annular slot configured to be connected to a pressurised air supply and to generate a flow of pressurised air in said through opening , said annular slot being delimited circumferentially by an upstream edge arranged on an upstream side of said annular slot and by a downstream edge arranged on a downstream side of said annular slot , 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 , said downstream edge having a convex shape, characterised in that said spray head comprises a first stage of at least two nozzles (3-6) and a second stage of at least two nozzles (13-16), said spray head having a longitudinal direction D2, said through opening being arranged between said first stage and said second stage in said longitudinal direction D2, each of said at least two nozzles (3-6) of said first stage being arranged above said through opening according to said longitudinal direction D2 and each of said at least two nozzles (13-16) of said second stage being arranged below said through opening according to said longitudinal direction D2. said spray head comprising a through opening and a ventilation device configured to circulate the surrounding air through said through opening according to a direction of circulation D1 between an upstream orifice and a downstream orifice of said through opening , said at least one nozzle (3-6, 13-16, 13'-16') being arranged on the side of said downstream orifice of said through opening to allow said sprayed pressurised water to be entrained by a flow of surrounding air expelled from said downstream orifice , said ventilation device having an annular slot configured to be connected to a pressurised air supply and to generate a flow of pressurised air in said through opening , said annular slot being delimited circumferentially by an upstream edge arranged on an upstream side of said annular slot and by a downstream edge arranged on a downstream side of said annular slot , 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 , said downstream edge having a convex shape, characterised in that said spray head comprises a first stage of at least two nozzles (3-6) and a second stage of at least two nozzles (13-16), said spray head having a longitudinal direction D2, said through opening being arranged between said first stage and said second stage in said longitudinal direction D2, each of said at least two nozzles (3-6) of said first stage being arranged above said through opening according to said longitudinal direction D2 and each of said at least two nozzles (13-16) of said second stage being arranged below said through opening according to said longitudinal direction D2. <EOS>