This cable management system helps to organise and protect cables in data centres, telecommunication facilities and other industrial environments. It incorporates a waterfall cable routing principle that routes cables from the roof to the ground, with each cable routing directly to its destination without crossing other cables. This principle helps to reduce the risk of damage and interference, while allowing easy tracing and management of cables. The roof mounting also allows for the easy fitting of a fan mounting plate for active rack ventilation. It also includes vented doors for quick installation and removable cable routing strips for tool-free access to the side rack areas.