
Upgrading the Cisco 3825 Fan Unit
Step 2 Remove the two screws that hold the top of the fan unit to the router. (See Figure 4.)
| Figure 4 | Removing Screws Holding the Top of the Fan Unit | 
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Step 3 Remove the four screws that hold the fan unit to the side of the chassis. (See Figure 5.)
| Figure 5 | Removing Fan Mounting Screws from the Side of the Chassis | 
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Fan mounting screws on the side of the chassis
Installing and Upgrading Fans in the Cisco 3825 Series Routers
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