Containment
Physically separating hot and cold air (cold-aisle, hot-aisle, or chimney) so cooling air is not wasted by mixing.
Current numbers
1.4–1.6legacy air-cooled PUE band; good containment + warm supply pushes toward low-1.2s
Physically separating hot and cold air (cold-aisle, hot-aisle, or chimney) so cooling air is not wasted by mixing.