Abstract: A new and improved method is provided for repairing or retrofitting cable management apparatus used in raised flooring systems constructed to deliver a source of building air, or HVAC, while managing cables passing through an access port constructed in the raised flooring structure without jeopardizing the underfloor plenum air delivery systems. A raised floor grommet assembly provides a grommet locking mechanism defining an assembly retention system that lockingly engages and removeably disengages a first section and a second section of the grommet assembly, and an access port locking mechanism that lockingly engages and removeably disengages an access port constructed in the raised flooring structure. The unique grommet assembly provides an efficient and effective method and apparatus designed for retrofitting cable management systems and accommodates system upgrades, workstation relocation, and HVAC management.