The present invention pertains to a gas blender for blending at least two different gases, the gas blender comprising a first gas control valve (10) for supplying a first gas, a second gas control valve (20) for supplying a second gas, a pressure vessel (40) in fluid communication with the first and second gas control valves (10, 20) to receive and store the first and second gases at above atmospheric pressure, and an output gas control valve (50) in fluid communication with an output of the pressure vessel for supplying the blended gas from the pressure vessel.
