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The recommended minimum height for a raised floor in a data center is typically around 40cm (16 inches). This height as a standard facilitates essential aspects of data center design, including providing adequate airflow for cooling systems, accommodating necessary cabling and electrical distribution, and ensuring efficient maintenance practices.

A raised floor of this height allows for the proper circulation of cooling air beneath the floor, which is crucial for maintaining the optimal operating temperature of the data center equipment. Additionally, having sufficient space under the floor is vital for routing power and communication cables, thus keeping them organized and away from the equipment. This height also provides sufficient room for future upgrades and changes in the cabling infrastructure without needing to replace the entire raised floor system, promoting versatility in the data center environment.

While other height options may provide more space, 40cm is generally seen as a balance between functionality and cost-effectiveness, making it the recommended minimum for most data center designs.