H3C SecPathT5030, Installation Manual, Page: 11 / 64

4
Table 4 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
IMPORTANT:
For good heat dissipation, make sure the following requirements are met:
•
The installation site has a good cooling system.
•
There is a minimum clearance of 100 mm (3.94 in) around the inlet and outlet air vents of the
chassis.
The device uses front-rear air aisles. By using different fan trays, it provides front-to-rear or
rear-to-front airflow to adapt to different installation environments.
The following fan trays are available for the device:
•
FAN-20F-2-A fan tray —It provides power supply-side intake and port-side exhaust airflows, as
shown in Figure 1 . The fan tray has a blue fan tray handle.
•
FAN-20B-2-A fan tray —It provides port-side intake and power supply-side exhaust airflows, as
shown in Figure 2 . The fan tray has a red fan tray handle.
Figure 1 Airflow when the FAN-20F-2-A fan trays are installed
Figure 2 Airflow when the FAN-20B-2-A fan trays are installed