A fluid spray head comprising: • a body forming a connection sleeve that is adapted to receive a valve rod of a dispenser member, such as a pump or a valve, the connection sleeve being connected via a feed duct , to a housing in which there extends a core that defines a core side wall and a core front wall , • a nozzle (2; 2') engaged in the housing around the core , the nozzle (2; 2') forming a spray orifice (O) through which the fluid leaves the spray head in the form of a spray, the spray orifice (O) presenting a chamber outlet diameter D3 and a chamber outlet section S3, • the core and the nozzle (2; 2') defining between them, from upstream to downstream: • a plurality of connection passages (P) in fluid communication with the feed duct , • a plurality of swirl channels (T) respectively connected to the connection passages (P), each swirl channel (T) presenting a channel length L1, a channel inlet (T0) having a channel inlet section S0 and a channel outlet (T1) having a channel outlet section S1, • a swirl chamber (C) into which the swirl channels (T) open out, the swirl chamber (C) defining a longitudinal axis of revolution X and presenting an axial length L2, a chamber inlet diameter D2and a chamber inlet section S2 where the swirl channels (T) open out, the spray orifice (O) forming an outlet for the swirl chamber (C), the spray head being characterized in that : • 30% of S2 ≤ S3 ≤ 55% of S2, and preferably S3 is equal to approximately 42% of S2, such that 54% of D2 ≤ D3 ≤ 74% of D2, and preferably D3 is equal to approximately 65% of D2, and • L1 ≥ 110% of D2, and preferably L1 is equal to approximately 150% of D2. • a body forming a connection sleeve that is adapted to receive a valve rod of a dispenser member, such as a pump or a valve, the connection sleeve being connected via a feed duct , to a housing in which there extends a core that defines a core side wall and a core front wall , • a nozzle (2; 2') engaged in the housing around the core , the nozzle (2; 2') forming a spray orifice (O) through which the fluid leaves the spray head in the form of a spray, the spray orifice (O) presenting a chamber outlet diameter D3 and a chamber outlet section S3, • the core and the nozzle (2; 2') defining between them, from upstream to downstream: • a plurality of connection passages (P) in fluid communication with the feed duct , • a plurality of swirl channels (T) respectively connected to the connection passages (P), each swirl channel (T) presenting a channel length L1, a channel inlet (T0) having a channel inlet section S0 and a channel outlet (T1) having a channel outlet section S1, • a swirl chamber (C) into which the swirl channels (T) open out, the swirl chamber (C) defining a longitudinal axis of revolution X and presenting an axial length L2, a chamber inlet diameter D2and a chamber inlet section S2 where the swirl channels (T) open out, the spray orifice (O) forming an outlet for the swirl chamber (C), • a plurality of connection passages (P) in fluid communication with the feed duct , • a plurality of swirl channels (T) respectively connected to the connection passages (P), each swirl channel (T) presenting a channel length L1, a channel inlet (T0) having a channel inlet section S0 and a channel outlet (T1) having a channel outlet section S1, • a swirl chamber (C) into which the swirl channels (T) open out, the swirl chamber (C) defining a longitudinal axis of revolution X and presenting an axial length L2, a chamber inlet diameter D2and a chamber inlet section S2 where the swirl channels (T) open out, the spray orifice (O) forming an outlet for the swirl chamber (C), • 30% of S2 ≤ S3 ≤ 55% of S2, and preferably S3 is equal to approximately 42% of S2, such that 54% of D2 ≤ D3 ≤ 74% of D2, and preferably D3 is equal to approximately 65% of D2, and • L1 ≥ 110% of D2, and preferably L1 is equal to approximately 150% of D2. <EOS>