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 µm
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.
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 adequate heat dissipation, make sure the following
requirements are met:
• A minimum clearance of 100 mm (3.94 in) is reserved around the air vents.
• The rack has a good ventilation system.
Figure 1 Airflow through the chassis (WX3508H)
ESD prevention
To prevent electrostatic discharge (ESD), follow these guidelines:
• Ground the device and rack or workbench reliably.
• Take dust-proof measures for the equipment room. For more information, see "Cleanliness."
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