Cisco ASR 9000 Series - Page 31

This figure shows the side and rear chassis air-flow clearance requirements for mounting the Cisco ASR 9904
Router in a 4-post enclosed rack.
Figure 24: Cisco ASR 9904 Router Clearance Requirements in a 4-Post Rack Installation
Cisco ASR 9000 Series Aggregation Services Router Hardware Installation Guide
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Preparing for Installation
Site Requirement Guidelines