FIRE EXTINGUISHING NOZZLE AND FIRE EXTINGUISHER

A first aspect of the present invention concerns a fire extinguishing nozzle comprising a mixing, a ventilation and a foaming chamber, wherein said ventilation chamber comprises a first hollow cylindrical body comprising at least three air inlet holes, said foaming chamber comprises a second hollow cylindrical body having an axial length (L) and an inner diameter (d), and said ventilation chamber and/or said foaming chamber comprise a mesh, wherein the ratio of the axial length over the inner diameter (L:d) is comprised between 4:5 and 9:5 for extinguishing class A fires, or between 6:1 and 10:1 for extinguishing class B fires.A second and third aspect respectively relate to a fire extinguisher comprising a fire extinguishing composition and a fire extinguishing nozzle, and to the use of a nozzle or fire extinguisher for extinguishing class A or class B fires.