Space And Air Flow Requirements - NEC Express5800 Series User Manual

Chapter 2 Preparations
Do not install the rack or server under the following environment. Doing so may cause malfunction of the server.
 Narrow space from which devices cannot be pulled out from the rack completely
 Place that cannot bear the total weights of the rack and devices mounted on the rack
Place where stabilizers cannot be installed or where the rack can be installed only after the practice of

proper earthquake-resistant construction
 Place of uneven or slanting floor
 Place of drastic temperature change (near a heater, air conditioner, or refrigerator)
 Place where intense vibration may be generated
 Place where corrosive gases (sulfur dioxide, hydrogen sulfide, nitrogen dioxide, chlorine, ammonia, ozone,
etc) exist. Place where the air (or dust) includes components accelerating corrosion (ex. sulfur, sodium
chloride) or conductive metals
 Place where chemicals may be accidentally sprayed over
 Place where a carpet not subject to anti-static process is laid
 Place where some objects may be fallen on the rack
 Place near a device generating intense magnetic field (such as TVs, radios, broadcast/communication
antennas, power transmission wires, and electromagnetic cranes) is placed.
 Place where the power cord of the server must be connected to an AC outlet that shares the outlet of
another device with large power consumption
Place near equipment that generates power noise (e.g., contact spark at power-on/power-off of

commercial power supply through a relay).
 Environment where operation of the server is not guaranteed
2.1.2

Space and air flow requirements

For easier repairing and improvement of ventilation, follow the space requirements when you determine the
install location of the rack.
 Make a clearance of 63.5 cm (25 in.) or more on the front side of the rack.
 Make a clearance of 76.2 cm (30 in.) or more on the back side of the rack.
 Make a clearance of 121.9 cm (48 in.) or more between the back side of the rack and the back side of the
other racks or the rack row.
In this server, the cold air is absorbed from the front door, and the hot air inside is discharged via the rear door.
Therefore, make sure to leave an adequate clearance both on the front and rear rack doors for absorption of
outside air into the cabinet. Also, make sure to leave an adequate clearance on the rear door for discharging hot
air from the cabinet.
If a server or rack component is not installed on every shelf in the rack, the air flow through the rack or the
server will change because the shelf is empty. To maintain adequate ventilation, blank panels should be
covered on all the shelves that do not have components installed.
Note
To prevent improper cooling situations or damages to the equipment, do not block
the ventilation openings.
Express5800/R120h-2E User's Guide
2. Installation and Connection
147