BS EN 50600-4-7:2020 pdf free.Information technology - Data centre facilities and infrastructures.Cooling Efficiency Ratio. BS EN 50600-4-7 This document specifies the Cooling Efficiency Ratio (CER) as a Key Performance Indicator (KPI) to quantify the efficient use of energy to control the temperature of the spaces within the data centre. This document: a) defines the Cooling Efficiency Ratio (CER) of a...