Cisco 12404 Installation And Configuration Manual page 278

Fan Tray Assembly
Allow sufficient air flow by maintaining 6 inches (15.24 cm) of clearance at both
Warning
the inlet and exhaust openings on the chassis because exhaust from other
equipment vented directly into the router air inlet may cause an over-heat
condition.
The fans draws room air in through an air filter on the opposite side of the chassis.
See
vents on the opposite side of the chassis.
The front, back and sides of the Cisco 12404 router must remain unobstructed to
ensure adequate air flow and prevent overheating inside the RP and line card cage.
We recommend at least 6 inches (15.2 centimeters) of clearance on all sides.
Figure A-9
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Cisco 12404 Internet Router Installation and Configuration Guide
A-26
Figure A-9. The fans draw air through the card cage and out through exhaust
Internal Air Flow—Top View
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6
Appendix A
3 3
Top view
5 5
Technical Specifications
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