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Installing and Upgrading Fans in the Cisco 2821 and Cisco 2851 Series Routers
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Upgrading the Cisco 2821 and Cisco 2851 Fan Unit
Step 2 Remove the three screws that hold the fan unit to the side of the chassis. (See number 1 in Figure 6.)
Figure 6 Removing Fan Mounting Screws from the Chassis
Step 3 Remove the one screw that holds the fan unit to the front of the chassis. (See number 2 in Figure 6.)
Step 4 Lift the fan unit out of the chassis.
1 Fan mounting screws on the side of the
chassis
2 Fan mounting screw on the front of the chassis
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