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 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 "
."
•
Maintain the humidity and temperature at an acceptable level. For more information, see
"
