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Installing a Fan Tray in a QFX3500 Device

Before you install a fan tray in a QFX3500 device, ensure that you have taken the necessary precautions to prevent electrostatic discharge (ESD) damage (see Prevention of Electrostatic Discharge Damage).

Ensure that you have the following parts and tools available to install a fan tray in a QFX3500 device:

  • ESD grounding strap

The fan trays in a QFX3500 device are hot-removable and hot-insertable field-replaceable units (FRUs): you can remove and replace them without powering off the device or disrupting device functions.


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


The fan tray provides FRU-to-port or port-to-FRU airflow depending on the device model you purchase.

To install a fan tray in a QFX3500 device (see Figure 1):

  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 tray from its bag.
  3. Using both hands, align the tray with the fan tray slot on the front panel of the chassis and slide it in until it is fully seated and the locking lever slides into place.

    Damage can occur if you attempt to install a fan tray into a chassis with a different airflow direction. Check the device model to ensure that you are installing a fan tray with the same airflow direction as the chassis. The fan trays are designed so that they can only be inserted into the QFX3500 device model that supports the same airflow type. See Cooling System and Airflow for a QFX3500 Device for more information.

Figure 1: Installing a Fan Tray in a QFX3500 DeviceInstalling a Fan Tray in a QFX3500 Device