Ventilation And Cooling; Ventilation Guidelines - Sun Microsystems Server X4-2 Installation Manual

Ventilation and Cooling

Always provide adequate space in front of and behind the rack to allow for proper
ventilation of the rackmounted servers. Do not obstruct the front or rear of the rack
with equipment or objects that might prevent air from flowing through the rack.
Rackmountable servers and equipment, including the Sun Server X4-2, typically
draw cool air in through the front of the rack and let warm air out the rear of the
rack. There is no airflow requirement for the left and right sides due to front-to-back
cooling.
If the rack is not completely filled with components, then cover the empty sections
will filler panels. Gaps between components can adversely affect airflow and cooling
within the rack. See also:
"Ventilation Guidelines" on page 13
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Related Information
"Environmental Requirements" on page 10
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Ventilation Guidelines

Air conditioning facilities usually do not precisely monitor or control temperature
and humidity throughout an entire computer room. Generally, monitoring is done at
individual points corresponding to multiple exhaust vents in the main unit, and
other units in the room. Special consideration should be paid to humidity when
using underfloor ventilation. When underfloor ventilation is used, monitoring is
done at each point close to an exhaust vent. Distribution of the temperature and
humidity across the entire room is uneven.
The Sun Server X4-2 has been designed to function while installed in a natural
convection airflow. The following requirements must be followed to meet the
environmental specification:
Ensure that there is adequate airflow through the system.
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Ensure that air intake is at the front of the system, and the air outlet is at the rear
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of the system.
Allow a minimum clearance of 1,232 mm (48.5 inches) at the front of the system,
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and 914 mm (36 inches) at the rear of the system for ventilation.
Ensure unobstructed airflow through the chassis. The server uses internal blowers
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that can achieve a total airflow of 100 CFM in normal operating conditions.
Ensure that air temperature rise through the server is no greater than 68˚F (20˚C).
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Preparing for Server Installation 13