4
Substance
Concentration limit (particles/m
3
)
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 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
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 F1000-AI-03 firewall uses passive cooling.
The F1000-AI-10 firewall provides front side-intake and rear side-exhaust airflow for heat dissipation.
The F1000-AI-20, F1000-AI-30, F1000-AI-50, F1000-AI-60, F1000-AI-70, F1000-AI-80, and
F1000-AI-90 firewalls provide left side-intake and right side-exhaust airflow for heat dissipation.
Figure1-2 Airflow through the F1000-AI-10 firewall chassis
