2-3
• The air intake and outlet vents of the server are not blocked.
• The front and rear rack doors are adequately ventilated to allow ambient room air to enter the
cabinet and allow the warm air to escape from the cabinet.
• The air conditioner in the equipment room provides sufficient air flow for heat dissipation of
devices in the room.
Figure 2-2 Airflow through the server
(1) to (8) Directions of the airflow into the chassis and power supplies
(9) to (10) Directions of the airflow out of the chassis
Temperature, humidity, and altitude requirements
To ensure correct operation of the server, make sure the room temperature, humidity, and altitude
meet the requirements as described in "Appendix C Environment requirements."
Cleanliness requirements
Mechanically active substances buildup on the chassis might result in electrostatic adsorption, which
causes poor contact of metal components and contact points. In the worst case, electrostatic
adsorption can cause communication failure.
Table 2-2 Mechanically active substance concentration limit in the equipment room
Substance Particle diameter Concentration limit
Dust particles ≥ 5 µm
≤ 3 x 10
4
particles/m
3
(No visible dust on desk in three days)
Dust (suspension) ≤ 75 µm ≤ 0.2 mg/m
3
Dust
(sedimentation)
75 µm to 150 µm ≤ 1.5 mg/(m
2
h)
Sand ≥ 150 µm ≤ 30 mg/m
3
The equipment room must also meet limits on salts, acids, and sulfides to eliminate corrosion and
premature aging of components, as shown in Table 2-3.
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