Cisco 7609-S Installation Manual page 31

Chapter 1 Product Overview
Cisco 7600 Internet Router Components
Power Supply Fan Assembly
The power supplies have a built-in fan; air enters the front of the fan (power-input
end) and exits through the back. An air dam keeps the airflow separate from the
rest of the chassis, which is cooled by the system fan assembly.
To replace a power supply, see the "Removing and Replacing the Power Supply"
section on page 5-2.
Cisco 7609 Internet Router Installation Guide
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