HP 245161-B22 - 10642 42U Rack Shock Pallet Best Practices Manual page 19

Configuring racks without air flow perforations
Older rack series, such as the Rack 7000 Series Racks and third-party racks with glass doors must
have the door removed to support the latest high-performance equipment. Components should not be
installed in a built-up enclosure unless the following conditions have been met:
• The enclosure is specifically designed to accommodate the component.
• There is proper ventilation for the component.
• All manufacturer instructions have been followed.
Rack placement and arrangement for proper air flow
Racks must be placed and arranged properly in the data center to provide sufficient air flow and
clearance for access to the rack.
In the front of the rack, a clearance of 48 in. (1219 mm) is required; this applies to individual rack
installations as well as when aligning rack rows so that the front doors are facing each other.
In the rear of the rack, a clearance of 30 in. (762 mm) is required to provide space for servicing the
rack.
If a data center has multiple rows of racks, the rows of racks can be arranged to take advantage of
the front-to-back airflow, by arranging racks front-to-front and back-to-back. Additionally, conditioned
air registers may be oriented along the front aisles and the return air registers in the back aisles. Such
an arrangement will utilize the aisle space as air plenums and will increase the efficiency of the air
conditioning. See Figure 4.
Figure 4. Airflow diagram
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