Air Plenum - Cisco ASR 903 Installation Manual

Overview
Figure 7: Cisco ASR 903 Fan Tray with Dust Filter and Dummy Cover (A903-FAN-E)
1 LEDs
2 Alarm
3 Dust filter
Dust Filter (A903-FAN-F)
The dust filter on the fan tray is a quadrafoam 45PPI filter which is 85 percent dust resistant. A dummy cover
(A903-FAN-F-B) secures the dust filter in the chassis.
Note Use the pull tab provided to easily access the filter.

Air Plenum

Air Plenum or air baffle assembly is used change the air flow pattern of the unit. When the router is installed
with the plenum, the air flow pattern is changed from side-side to front-back. The air flow front-back pattern
provides a rack installation bay with a cool front zone and hot rear zone. For installing the plenum, see
the Chassis in the Air
Note
When the air plenum and the fan filter are installed in the chassis, the system operating temperature is limited
to 55 degrees Celsius.
4 Dummy cover
5 Pull tab
—
Plenum.
Cisco ASR 903 and ASR 903U Aggregation Services Router Hardware Installation Guide
Dust Filter (A903-FAN-F)
Installing
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