NOVELTY - The integrated gas management device includes a gas-to-gas humidifier core and a heat exchanger attached to a first end of the humidifier core. The humidifier core comprises one or more first gas flow passages, one or more second gas flow passages, a first gas inlet manifold and a first gas outlet manifold in flow communication with the first gas flow passages, and a second gas inlet manifold and a second gas outlet manifold in flow communication with the second gas flow passages. The manifolds extend through the humidifier core from the first end to the second end of the humidifier core.    USE - Integrated gas management device for humidifying and cooling cathode charge air in fuel cell system, and/or removing water from cathode exhaust in fuel cell system, e.g., for automotive propulsion.    ADVANTAGE - The integrated gas management device reduces the number of components and provides more direct connections between the components. This helps to reduce the number of components of the fuel cell system, and thus helps to save space and reduce costs. The elimination of the structural end plates for humidifier stack brings about additional cost and space savings by reducing the number of components, and permitting more of the packaging space to be allotted to the humidifier stack. The elastic elements help to maintain a constant compressive force on the humidifier stack over the lifetime of the Air Management Device (AMD), thus providing secure sealing between all layers and components of the AMD, while maintaining compression of humidifier stack and rigidity of the AMD.    DETAILED DESCRIPTION - The heat exchanger comprises at least one first gas flow passage, at least one coolant flow passage, and a gas outlet opening through which the first gas flow passage is in flow communication with the first gas inlet manifold of the humidifier core.    DESCRIPTION OF DRAWING(S) - The drawing is a perspective view showing end plates with integrated bypass lines and valves.    Bypass line (70)    Bypass valve (80)    Openings (130,132)    Valve rod (140)    End plate (150)