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Despite the emergence of numerous alternative aircooling methodologies in data centers, it remains the most common practice to use an underfloor cool-air supply plenum. This plenum is often also used as a means of concealing power and IT cables. Air leakage from this plenum is a commonly encountered problem and occurs primarily at areas where the cables pass through the floor tiles. A popular solution to this problem is the use of grommets, which seal around the cable penetrations and reduce leakage. The financial impact of this problem and guidance on the relative effectiveness of numerous available brush grommets is provided.