Cisco ASR 9000 Series Installation Manual page 28

Site Requirement Guidelines
Table 1-1
Router Type
Cisco ASR 9922
Cisco ASR 9912
The fan trays maintain acceptable operating temperatures for the internal components by drawing in cool
air through the air filter, and circulating the air through the card cage. Each power supply is also
equipped with fans that draw cooler air into the front of the power supply and force warmer air out of
the back of the chassis.
Note See the
air-flow clearance requirements for installation in an enclosed 4-post rack.
Figure 1-12
Fan trays
Room air
Cisco ASR 9000 Series Aggregation Services Router Hardware Installation Guide
1-16
Chassis Air Flow Guidelines (continued)
Chassis Air Flow
Air circulated by four fan trays. See
between the line cards in the top cage and the RP and Fabric Cards (FC) in the
middle cage. Another two fan trays are located between the middle cage and the
line cards in the bottom cage.
Air is circulated by two fan trays located above the line cards. See
"Rack-Mounting and Air Flow Clearance Guidelines" section on page 1-20
Air Flow Path through the Cisco ASR 9010 Router—Side View
RSPs and line cards
Power modules
Front air
Power modules
intake
Chapter 1 Preparing for Installation
Figure 1-15. Two fan trays are located
for details on
Air exhaust
Rear air
exhaust plenum
Figure 1-16.