3
Table 2
Dust concentration limit in the equipment room
Substance
Concentration limit (particles/m
3
)
Dust particles
≤
3 x 10
4
(No visible dust on desk in three days)
NOTE:
Dust particle diameter
≥
5
μ
m
To eliminate corrosion and premature aging of components, the equipment room must also meet limits on
salts, acids, and sulfides, as shown in
.
Table 3
Harmful gas limits in an equipment room
Gas Max.
(mg/m
3
)
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
NO
2
0.04
Cooling
The device uses left to right airflow for heat dissipation. Plan the installation site for adequate ventilation.
•
H3C recommends that you leave a minimum of 10 cm (3.94 in) of clearance around the air vents.
•
Make sure the rack or workbench has a good ventilation system.
Figure 1
Airflow through the chassis
ESD prevention
To prevent electrostatic discharge (ESD), follow these guidelines:
•
Ground the device reliably.
•
Take dust-proof measures for the equipment room. For more information, see "
•
Maintain the humidity and temperature at acceptable levels. For more information, see
"
