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Appendix A Background and Reference 53
Airflow The server operating airflow is 92 cfm, regardless
of ambient air and altitude. This airflow provides
appropriate cooling up to 104
o
F (40
o
C) and 10,000
feet (3000 meters).
For proper ventilation of the server, the front and back
doors must comply with the following minimum open area
requirements.
• 60 percent of the area of the front door that is directly in
front of the server must be open.
• 63 percent of the area of the back door that is directly
behind the server must be open.
• Maintain a minimum of 1.5 inches (3.8 cm) clearance
between the server and any front or back doors.
If the doors of the cabinet do not meet the open area
requirements, remove the door or doors that do not comply.
Vertical mounting rails The cabinet must have two pairs of vertical mounting rails
(one pair in front, one pair in back) that conform to the EIA
(RETMA) standard for mounting hole spacing.
Left-side-to-right-side rail spacing (mounting hole center to
mounting hole center) for front and back rails must be 17.72
inches (45 cm).
Front-to-back rail spacing must be at least 23 inches (58.42
cm) and not more than 34.5 inches (87.63 cm) from the
outside face of the front rail to the outside face of the back
rail.
Front and back vertical rail mounting faces must be parallel
with each other and with the front plane of the rack.
EMI shielding Electromagnetic interference (EMI) shielding requirements
are met by the system chassis and metal side panels, which
remain in place when the server is rackmounted.
Minimum service access An area not less than 3 feet (1 meter) deep and
6 feet (2 meters) wide must be available in front of
the cabinet, for installation and service access.
Fire containment The cabinet must meet Underwriters Laboratories, Inc., and
TUV Rheinland of N.A. requirements for fire containment.
TABLE A-4 4-Post Cabinet Requirements (Continued)
Cabinet Feature Requirement