A nozzle for compressed air, comprising a body (1 ) which comprises a plurality of air channels (12) of the body (1 ), a fixed nozzle (2) which is immovably connected to the body (1) and which comprises a plurality of air channels (22) of the fixed nozzle (2), a turbine part (4) which is adapted to rotate in relation to the body (1), and a rotating nozzle (3) which is immovably coupled to the turbine part (4) and which comprises a plurality of grooves (34). At a first phase, the air stream is adapted to run along the plurality of air channels (12) of the body (1 ) to the turbine part (4), and at a second phase, along the plurality of the air channels (22) of the fixed nozzle (2) out of the turbine part (4), and after the air channels (22) of the fixed nozzle (2) out of the compressed-air nozzle through the grooves (34) of the rotating nozzle (3), whereby the air stream is more turbulent than prior to the first phase.