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Installing a Fan Module in a QFX5100 Device

Before you install a fan module in a QFX5100 device, ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

The fan modules in a QFX5100 device are hot-removable and hot-insertable field-replaceable units (FRUs): you can remove and replace them without powering off the switch or disrupting switch functions.


Replace a failed fan module with a new fan module within 1 minute of removal to prevent chassis overheating. Before removing the fan module, ensure you have a replacement fan module at hand.


The fan module provides FRU-to-port or port-to-FRU airflow depending on the switch product SKU you purchase. In legacy switches, or switches with an LCD, this airflow is called front to back and back to front.

To install a fan module in a QFX5100 device (see Figure 1 and Figure 2):

  1. Attach the ESD grounding strap to your bare wrist, and connect the strap to the ESD point on the chassis.
  2. Taking care not to touch the connectors, remove the fan module from its bag.
  3. Align the module with the open slot on the management panel of the chassis and slide it in until it is fully seated.

    Damage can occur if you attempt to install a fan module into a chassis with a different airflow direction. Compare the switch product SKU with the airflow marking on the handle to ensure that you are installing a fan module with the same airflow direction as the chassis. The fan modules are designed so that they can only be inserted into the QFX5100 product SKU that supports the same airflow type. See Cooling System and Airflow in a QFX5100 Device for more information.

  4. Using a Phillips screwdriver, turn the locking screw until it is tight.
Figure 1: Installing a Fan Module in a 1 U QFX5100 DeviceInstalling a Fan Module in a 1 U QFX5100 Device
Figure 2: Installing a Fan Module in a 2 U QFX5100-96S DeviceInstalling a Fan Module in a 2 U QFX5100-96S Device