Often overlooked, the small space between the bottom of an IT rack or cabinet and the raised floor or slab can have a significant impact on IT inlet temperatures. Such spaces are common, as casters and leveling feet under IT cabinets creates gaps from half an inch up to two or more inches between the floor and the bottom of the cabinet. However, this space allows the hot air from the IT equipment exhaust at the rear of the rack to flow under the rack and back into the IT equipment air inlets at the front of the rack. This recirculation of exhaust air increases the IT inlet temperatures, contributes to hot spots, and can ultimately lead to increased failure rates of IT equipment. This study examined the impact of sealing these small gaps.
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