4
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 Table1-3.
Table1-3 Harmful gas limits in an equipment room
3
SO
2
0.2
H
2
S 0.006
NH
3
0.05
Cl
2
0.01
NO
2
0.04
Cooling system
For adequate cooling of the firewall, follow these guidelines:
Install the firewall at the installation site with its airflow direction meeting the ventilation
requirements.
Workbench mounting—Ensure a minimum clearance of 100 mm (3.94 in) around the air
inlet and outlet vents of the chassis.
19-inch rack mounting—Ensure a minimum clearance of 80 mm (3.15 in) around the air
inlet and outlet vents of the chassis and a distance of 1U (44.45 mm, or 1.75 in) between the
chassis and other devices.
Make sure the installation site has a good cooling system.
The F1005 and F1010 firewalls use passive cooling for heat dissipation.
The F1020, F1030, F1050, F1060, F1070, F1080, and F1090 firewalls provide left side-intake and
right-side exhaust airflow for heat dissipation.
Figure1-2 Airflow through the F1080 firewall chassis
ESD prevention
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."
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