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Cisco ASR 9000 Series Aggregation Services Router Overview and Reference Guide
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Chapter 2      Functional Description
Cooling System Functional Description
The Cisco ASR 9922 Router has three air filters on the middle cage (see Figure 2-76). The center air 
filter covers the front of the FC cards. The side air filters cover the RP cards.
Figure 2-76 ASR 9922 Router Chassis Air Filters 
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