5-45
Cisco 2900 Series and 3900 Series Hardware Installation Guide
OL-18712-03
Chapter 5 Installing and Upgrading Internal Modules and FRUs
Replacing a Fan Tray or Air Filter
Replacing a Fan Tray or Air Filter
The Cisco 2900 series and 3900 series routers have hot-swappable fan trays and air filters that are field
replaceable units (FRUs). The fan tray includes all of the router fans in one assembly. If a fan fails,
replace the tray using a flat-blade or Phillips screwdriver.
Note We recommended replacing fan filters every six months, or when dirty, whichever comes first.
Before Hot-Swapping a Fan Tray
Before hot-swapping a fan tray, read the safety precautions below.
• Read the entire procedure and have the required tools available.
• Do not attempt the hot-swap in ambient air temperature above 90°F (32°C).
• Do not attempt the hot-swap at an altitude above 6000 feet (1829 meters).
• When the router is being operated, it is recommended to change the fans within the following times
to ensure the router does not overheat:
–
Cisco 2911 within 2 minutes
–
Cisco 2921 or 2951 within 2 minutes
–
Cisco 3900 series within 1.5 minutes
Cisco 2911
• Replacing the Cisco 2911 Fan Tray, page 5-45
• Replacing the Cisco 2911 Air Filter, page 5-46
Cisco 2921 and Cisco 2951
• Replacing the Cisco 2921 or 2951 Fan Tray, page 5-47
Cisco 2900 and Cisco 3900 Series
• Replacing the Cisco 3900 Series Fan Tray, page 5-48
• Replacing the Cisco 3900 Series Air Filter, page 5-49
Replacing the Cisco 2911 Fan Tray
To hot-swap a fan tray, complete the following steps:
Note If hot-swapping the fan tray, it is recommended to complete the operation within 2 minutes to ensure the
router remains within operating temperature.
Step 1 Read the “Safety Warnings” section on page 5-2 section and disconnect the power supply before you
perform any module replacement.
Step 2 Unsnap the bezel by pulling it straight out from the chassis. See Figure 5-33.
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