![background image](http://html.mh-extra.com/html/cisco/asr-9000-series/asr-9000-series_installation-manual_64864036.webp)
Figure 22: Cisco ASR 9904 Router Clearance Requirements in a 4-Post Rack Installation
Cisco ASR 9906 Router Clearance Requirements
To install the Cisco ASR 9906 Router in a 4-post enclosed cabinet:
• The front and rear doors of the cabinet must be removed or be perforated with a minimum open area of
65 percent (70 percent for 800-mm racks).
Cisco ASR 9000 Series Aggregation Services Router Hardware Installation Guide
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Preparing for Installation
Cisco ASR 9906 Router Clearance Requirements