Cisco ASR 9901 Manual page 10

Preparing for Installation
Chassis Air Flow Guidelines
Figure 7: Air Flow Path through the Cisco ASR 9901 Router
Cisco ASR 9001 Router
Cool air is circulated through the Cisco ASR 9001 Router by one fan tray located along the right side of the
router (see the following figure).
The fan tray maintains acceptable operating temperatures for the internal components by drawing in cool air
through the vents, and circulating the air through the chassis. Each power supply is also equipped with fans
that draw cool air into the front of the power supply and force warm air out of the air exhaust.
Note See the following section for details on air flow clearance requirements for installation in an enclosed 4-post
rack.
Preparing for Installation
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