4
Substance Concentration limit (particles/m
3
)
NOTE:
Dust particle diameter ≥ 5 µm
The equipment room must also meet strict limits on salts, acids, and sulfides to eliminate corrosion
and premature aging of components, 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 system
The F1005 and F1010 firewalls cool naturally on their own.
The F1020, F1030, F1050, F1060, F1070, F1080, and F1090 firewalls provide left side-intake and
right-side exhaust airflow for heat dissipation.
For adequate cooling of the firewall, follow these guidelines:
• Install the firewall at the installation site with its airflow direction meeting the ventilation
requirements.
• Reserve a minimum clearance of 100 mm (3.94 in) around the inlet and outlet air vents.
• Make sure the installation site has a good cooling system.
Figure 1 Airflow through the firewall chassis
ESD prevention
ESD prevention guidelines
To prevent electrostatic discharge (ESD), follow these guidelines:
• Make sure the firewall, the workbench, and the rack are reliably grounded.
• Take dust-proof measures for the equipment room. For more information, see "Cleanliness."
• Maintain the
humidity and temperature at an acceptable level. For more information, see
"Temperature and humidity."
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