An inert gas distribution system nozzle 1 including an inlet 10 to receive fluid from a fluid supply, a chamber 32 to receive the fluid from the inlet and dimensioned relative to the inlet to permit the fluid to expand to form a mist, and at least one passage 34 to receive the fluid from the chamber and dimensioned relative to the chamber to promote condensing of the mist, wherein the, or each, passage comprises an outlet 40 to emit the fluid from the nozzle. A cross-sectional area of the passage is less than a cross-sectional area of the chamber.