Fiber metering system including a fiber metering vessel, comprising: • a loading port suitable for receiving bundles of fibers, • a processing unit elongated along a privileged axis and arranged inside the vessel, the processing unit being suitable for: ∘ in a first operating state, cooperating with the loading port in order to be supplied with bundles of fibers, ∘ in a second operating state that is different from the first operating state, disassembling the bundles of fibers and ejecting the fibers thus isolated from one another, from the disassembled bundles, into the vessel, the processing unit further comprising a rotating drum provided with a perforated wall, said rotating drum being suitable for rotating about the privileged axis in the second operating state of the processing unit, the system further comprising a fluid transport device suitable for transporting a predetermined quantity of the isolated fibers, the metering vessel further comprising a receiving hopper suitable for recovering the isolated fibers ejected by the processing unit, the privileged axis being perpendicular to gravity, the perforated wall of the rotating drum being elongated along the privileged axis, the fluid transport device being suitable for cooperating with the receiving hopper to transport the predetermined quantity of isolated fibers from the receiving hopper to a remote container, the fluid transport device comprising an isolated fiber collector, said isolated fiber collector cooperating with the receiving hopper of the metering vessel, the fluid transport device being pneumatic, based on a flow of compressed air, characterized in that the rotating drum is suitable for remaining stationary in the first operating state of the processing unit, in that the processing unit comprises scales linked to the rotating drum, in that said perforated wall comprises a hatch suitable for: • being open in the first operating state of the processing unit, the open hatch giving access to the interior of the rotating drum, • being closed in the second operating state of the processing unit, the closed hatch blocking all access to the interior of the rotating drum, in that the isolated fiber collector comprises, at the end thereof oriented toward the receiving hopper, at least one suction head suitable for sucking, under a vacuum in the fluid transport device, the isolated fibers in the receiving hopper, in that the suction head has an opening oriented toward the receiving hopper of the metering vessel, and in that the suction head comprises an air regulating valve suitable for controlling a force induced, via the opening, by the suction vacuum of the fluid transport device. • a loading port suitable for receiving bundles of fibers, • a processing unit elongated along a privileged axis and arranged inside the vessel, the processing unit being suitable for: ∘ in a first operating state, cooperating with the loading port in order to be supplied with bundles of fibers, ∘ in a second operating state that is different from the first operating state, disassembling the bundles of fibers and ejecting the fibers thus isolated from one another, from the disassembled bundles, into the vessel, ∘ in a first operating state, cooperating with the loading port in order to be supplied with bundles of fibers, ∘ in a second operating state that is different from the first operating state, disassembling the bundles of fibers and ejecting the fibers thus isolated from one another, from the disassembled bundles, into the vessel, • being open in the first operating state of the processing unit, the open hatch giving access to the interior of the rotating drum, • being closed in the second operating state of the processing unit, the closed hatch blocking all access to the interior of the rotating drum, in that the isolated fiber collector comprises, at the end thereof oriented toward the receiving hopper, at least one suction head suitable for sucking, under a vacuum in the fluid transport device, the isolated fibers in the receiving hopper, in that the suction head has an opening oriented toward the receiving hopper of the metering vessel, and in that the suction head comprises an air regulating valve suitable for controlling a force induced, via the opening, by the suction vacuum of the fluid transport device.