Full aluminum built cooling body constructed to fit four drives within a three device bay fitting, the MB454 Series follows the tradition of industrial systems' needs for stability, durability, toughness and high sensitivities for mass storage operating conditions. It's equipped with a hot swappable fan that may be detached if confined by depth limitations when integrating, or when replacement is necessary. No tools or wiring required. Simply swap with a new fan and back to operation! It's both space saving & user friendly for industrialized system solutions or