A cooling system for use in a mass storage chassis assembly is provided. The cooling system in one example includes a frame including one or more fan bays for receiving one or more fan units, one or more fan bay connectors located in the one or more fan bays and configured to couple to and provide electrical power to the one or more fan units, a plurality of retainer devices positioned in each fan bay, with the plurality of retainer devices configured to receive and hold a plurality of projections extending from each fan unit, and the one or more fan units configured to be installed to the one or more fan bays, with each fan unit including a fan connector that couples to the corresponding fan bay connector.