The illustrated fiber management assembly includes a rectangular case configured to fit between bays of equipment. Fiber connected to the equipment bays enters the case through a top inlet opening and exits the case through one of two outlet openings extending along respective sides of the case, with any excess fiber being located within the storage chamber defined by the case. Adjacent the inlet opening of the case is a clamp that is compressible around the fiber to relieve axial loading on the fiber. The management assembly is provided with a slack take-up mechanism that is configured to support excess fiber in a looped arrangement within the storage chamber. The slack take-up mechanism includes a plurality of spool assemblies adjustably positioned along the length of the storage chamber. Supported for sliding movement along the length of each outlet opening is at least one fiber router designed to support the fiber exiting the storage chamber and limit bending of the fiber as it is directed to the equipment bay.