Air is pulled into the chassis and pulled through the fan trays and management boards.
Hot air exhausts from the front of the chassis, where the FRUs are installed. See
Figure 16 on page 31.
Figure 16: Port-to-FRU Airflow Through the QFX3500 Chassis
Each airflow type requires specific fan trays, management boards, and power supplies,
that have fan modules oriented in the proper direction. The fan trays and management
boards are designed so that they can only be inserted into the QFX3500 device model
that supports the same airflow type. The power supplies have labels and arrows on the
handles that depict the direction of airflow (see Figure 17 on page 31). The label AFI
denotes FRU-to-port airflow, AFO denotes port-to-FRU airflow.
CAUTION: Verify that the direction of the arrow on the power supply handle
matches the direction of airflow in the chassis. See Table 10 on page 30 to
determine your model’s airflow direction.
Figure 17: Label Identifying Airflow Direction on Power Supply Handle
31Copyright © 2017, Juniper Networks, Inc.
Chapter 3: Cooling System and Airflow
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