4
Gas
Max. (mg/m
3
)
Cl
2
0.01
NO
2
0.04
Cooling system
The firewall provides front side-intake and rear 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.
Ensure a minimum clearance of 100 mm (3.94 in) around the air inlet and outlet vents of the
chassis.
If you install the firewall in a standard 19-inch rack, ensure 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.
Figure1-2 Airflow through the 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 "
•
Maintain the humidity and temperature at an acceptable level. For more information, see
"
•
Put the removed power supplies away on an ESD workbench, with the PCB upward, or put
them in ESD bags for future use.
•
Always wear ESD clothing, ESD gloves, and an ESD wrist strap.
EMI
All electromagnetic interference (EMI) sources, from outside or inside of the firewall and application
system, adversely affect the firewall in the following ways:
•
A conduction pattern of capacitance coupling.
•
Inductance coupling.
•
Electromagnetic wave radiation.
•
Common impedance (including the grounding system) coupling.
To prevent EMI, use the following guidelines:
