A nozzle structure for a paint spray gun, is comprised of a central outlet for paint, an annular slot surrounding the central outlet, the annular slot being connected inside the nozzle structure via an annular duct to a number of virtually axially parallel bores, the bores being situated on at least one circle about a central axis of the nozzle structure, apparatus for providing.[.,.]. compressed air via the bores for delivery to the annular duct, and an air .[.reversing.]. .Iadd.deflection .Iaddend.disk located inside the annular duct and opposite the bores.