HP ProLiant ML350 G4 Server - Manual (Page 31)

Server Setup 31
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Leave a minimum clearance of 121.9 cm (48 in) from the back of the rack to
the back of another rack or row of racks.
HP servers draw in cool air through the front and expel warm air through the
rear. Therefore, the front and rear rack doors must be adequately ventilated to
allow ambient room air to enter, and allow the warm air to escape from the
cabinet.
CAUTION: To prevent improper cooling and damage to the
equipment, do not block the ventilation openings.
The 9000 and 10000 Series racks provide proper server cooling from flow-
through perforations in the front and rear doors that provide 64 percent open area
for ventilation.
CAUTION: When using a Compaq branded 7000 Series rack,
you must install the high airflow rack door insert [P/N 327281-B21 (42U)
or P/N 157847-B21 (22U)] to provide proper front-to-back airflow and
cooling.
CAUTION: If a third-party rack is used, observe the following
additional requirements to ensure adequate airflow and to prevent
damage to the equipment:
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Front and rear doors—If the 42U rack includes closing front and rear
doors, you must allow 5,350 sq cm (830 sq in) of holes evenly
distributed from top to bottom to permit adequate airflow (equivalent
to the required 64 percent open area for ventilation).
Side—The clearance between the installed rack component and the
side panels of the rack must be a minimum of 7 cm (2.75 in).
When vertical space in the rack is not filled by a server or rack component, the
gaps between the components cause changes in airflow through the rack and
across the servers. Cover all gaps with blanking panels to maintain proper
airflow.
CAUTION: Always use blanking panels to fill empty vertical
spaces in the rack. This arrangement ensures proper airflow. Using a
rack without blanking panels results in improper cooling that can lead to
thermal damage.