Abstract: A three-stage disposable filter cartridge for filtering a gaseous fluid, especially breathable compressed air, and consisting of a preferably cylindrical housing having at least an inlet and an outlet, the interior of the housing being provided with a plurality of concentrically disposed separate chambers containing different types of filtering media and mutually arranged such that the fluid to be filtered flows sequentially through the individual chambers one after another in a labyrinth-like path. The first chamber contains a filtering medium providing coarse de-humidification of the fluid, the second chamber contains an oil vapor adsorbing medium and the third chamber contains a fine de-humidification medium.