content_image/992166.jpg
Figure 10-2 does not represent any particular server system type, and is intended only to show hot and cold airflow and the arrangement of server aisles. 

<img src='content_image/992166.jpg'>

As shown in Figure 10-2, rows of servers must be placed front-to-front. Chilled air is provided through perforated floor panels that are placed in rows between the fronts of servers (the cold aisles). Perforated tiles generally are not placed in the hot aisles. If your computer room causes the temperature in the hot aisles to exceed a comfortable temperature, add as many perforated tiles as necessary to create a satisfactory comfort level. Heated exhaust air exits the computer room above the computing equipment. 

With the standard z14 rear covers (FC #0160), the exiting airflow direction can be customized, which provides you more flexibility in placing z14 servers in your data center. Optional Thin doors (non acoustic, non-vectored) are available also (FC #0161). 

For more information about the requirements for air-cooling options, see IBM 3906 Installation Manual for Physical Planning,  GC28-6965. 

## Water-cooling system requirements 

The water-cooling system requires a chilled customer building water supply to be supplied to the z14 water-cooling units (WCUs). A z14 server requires four connections to the facility water: Two feeds and two returns. 

Raised floor:  The minimum raised floor height for a water-cooled system is 22.86 cm (8.6 in.). 

