2-3
Figure 2-2 Airflow through the server
(1) and (2) Directions of intake airflow through the chassis and power supplies
(3) Directions of exhaust airflow out of the power supplies
(4) to (7) Directions of exhaust airflow out of the chassis
Temperature and humidity requirements
To ensure correct operation of the server, make sure the room temperature and humidity meet the
requirements as described in "Appendix A Server specifications."
Equipment room height requirements
For the server to operate correctly, make sure the equipment room height meets the requirements
described in "Appendix A Server specifications."
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 limits in the equipment room
Substance
Particle diameter
Concentration limit
Dust particles
≥
5 µm
≤
3 x 10
4
particles/m
3
(No visible dust on the tabletop over 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
.
