HP 418800-B21 HP StorageWorks 70 Modular Smart Array Enclosure User Guide (434 - Page 13

Installing the enclosure, Environmental requirements, Space and airflow requirements

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3 Installing the enclosure Environmental requirements When installing the enclosure in a rack, select a location that meets the environmental standards described in this section. Space and airflow requirements To allow for servicing and adequate airflow, observe the following space and airflow requirements when deciding where to install a rack: • Leave minimum clearance of 63.5 cm (25 in) in front of the rack. • Leave minimum clearance of 76.2 cm (30 in) behind the rack. • Leave 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 enclosures draw in cool air through the front door and expel warm air through the rear door. Therefore, the front and rear rack doors must be adequately ventilated to allow ambient room air to enter the cabinet, and the rear door must be adequately ventilated to 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. CAUTION: When a 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. 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. 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. 70 Modular Smart Array User Guide 13

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3 Installing the enclosure
Environmental requirements
When installing the enclosure in a rack, select a location that meets the environmental standards
described in this section.
Space and airflow requirements
To allow for servicing and adequate airflow, observe the following space and airflow requirements
when deciding where to install a rack:
•
Leave minimum clearance of 63.5 cm (25 in) in front of the rack.
•
Leave minimum clearance of 76.2 cm (30 in) behind the rack.
•
Leave 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 enclosures draw in cool air through the front door and expel warm air through the rear door.
Therefore, the front and rear rack doors must be adequately ventilated to allow ambient room air to
enter the cabinet, and the rear door must be adequately ventilated to 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.
CAUTION:
When a 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. 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.
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.
70 Modular Smart Array User Guide
13