Fluid delivery head for a fuel cell, the fuel cell being intended to function in open mode with recirculation of hydrogen and having: • at least one stack of electrochemical cells, comprising inlet manifolds (12.1, 13.1, 14.1) and outlet manifolds (12.2, 13.2, 14.2), which open onto one and the same fluidic connection face of the stack and are designed to ensure the flow of fluids in the stack, including a hydrogen inlet manifold (12.1) and a hydrogen outlet manifold (12.2), and • at least one fluidic hydrogen supply line intended to be connected to the hydrogen inlet manifold (12.1), o the head having: • fluidic chambers (24, 26, 28), including a fluidic hydrogen inlet chamber (24.1) and a fluidic hydrogen outlet chamber (24.2), which are intended to communicate with the inlet and outlet manifolds (12, 13, 14), and being airtight with respect to the exterior environment of the head when the latter is mounted on the stack, and being delimited transversely, in a main plane of the head, by at least one transverse wall; o the head being characterized in that it also has: • a central chamber, which is surrounded, in the main plane, by the fluidic chambers (24, 26, 28) and has at least two ventilation openings allowing fluidic communication, in the main plane, between the central chamber and the exterior environment of the head; • an ejector, which is situated in the central chamber, is connected to the fluidic hydrogen inlet chamber (24.1) and is intended to be connected to the fluidic hydrogen supply line; • a fluidic hydrogen recirculation line, which is situated in the central chamber and is connected to the fluidic hydrogen outlet chamber (24.2) and to the ejector. • at least one stack of electrochemical cells, comprising inlet manifolds (12.1, 13.1, 14.1) and outlet manifolds (12.2, 13.2, 14.2), which open onto one and the same fluidic connection face of the stack and are designed to ensure the flow of fluids in the stack, including a hydrogen inlet manifold (12.1) and a hydrogen outlet manifold (12.2), and • at least one fluidic hydrogen supply line intended to be connected to the hydrogen inlet manifold (12.1), o the head having: • fluidic chambers (24, 26, 28), including a fluidic hydrogen inlet chamber (24.1) and a fluidic hydrogen outlet chamber (24.2), which are intended to communicate with the inlet and outlet manifolds (12, 13, 14), and being airtight with respect to the exterior environment of the head when the latter is mounted on the stack, and being delimited transversely, in a main plane of the head, by at least one transverse wall; • fluidic chambers (24, 26, 28), including a fluidic hydrogen inlet chamber (24.1) and a fluidic hydrogen outlet chamber (24.2), which are intended to communicate with the inlet and outlet manifolds (12, 13, 14), and being airtight with respect to the exterior environment of the head when the latter is mounted on the stack, and being delimited transversely, in a main plane of the head, by at least one transverse wall; o the head being characterized in that it also has: • a central chamber, which is surrounded, in the main plane, by the fluidic chambers (24, 26, 28) and has at least two ventilation openings allowing fluidic communication, in the main plane, between the central chamber and the exterior environment of the head; • an ejector, which is situated in the central chamber, is connected to the fluidic hydrogen inlet chamber (24.1) and is intended to be connected to the fluidic hydrogen supply line; • a fluidic hydrogen recirculation line, which is situated in the central chamber and is connected to the fluidic hydrogen outlet chamber (24.2) and to the ejector. • a central chamber, which is surrounded, in the main plane, by the fluidic chambers (24, 26, 28) and has at least two ventilation openings allowing fluidic communication, in the main plane, between the central chamber and the exterior environment of the head; • an ejector, which is situated in the central chamber, is connected to the fluidic hydrogen inlet chamber (24.1) and is intended to be connected to the fluidic hydrogen supply line; • a fluidic hydrogen recirculation line, which is situated in the central chamber and is connected to the fluidic hydrogen outlet chamber (24.2) and to the ejector.