Cisco 2900 Series Installation Manual page 72

Router Environmental Requirements
Baffles can help to isolate exhaust air from intake air, which also helps to draw cooling air through
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the chassis. The best placement of the baffles depends on the airflow patterns in the rack, which can
be found by experimenting with different configurations.
When equipment installed in a rack (particularly in an enclosed rack) fails, try operating the
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equipment by itself, if possible. Power off other equipment in the rack (and in adjacent racks) to
allow the router under test a maximum of cooling air and clean power.
Cisco 2900 Series and 3900 Series Hardware Installation Guide
2-6
Chapter 2 Preparing for Router Installation