Designs with perforated tiles on a raised floor
"Perforated tiles on a raised floor often deliver substantially more or less airflow than expected, resulting in inefficiencies and even equipment failure due to inadequate cooling. In this paper, the impact of data center design parameters on perforated tile airflow is quantified and methods of improving airflow uniformity are discussed."
Source: Airflow Uniformity through Perforated Tiles in a Raised-Floor Data Center (White Paper 121)
Read the full White Paper here.