Juniper PTX5000 Hardware Manual page 51

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interchangeable with the horizontal fan trays. The fans in the Fan Tray 0 are set to a default speed of
21% of maximum speed.
Figure 11: Vertical Fan Tray
• Cooling zone 1—The upper Fan Tray 1 and lower Fan Tray 2 horizontal fan trays, each of which
contain six fans, cool the components installed in the front card cage (FPCs and PICs), and the CCGs.
Both horizontal fan trays are interchangeable with each other.
Cooling zone 1 has two sections:
• Cooling zone 1 section 1 cools FPCs 0 through 4.
• Cooling zone 1 section 2 cools FPCs 3 through 7.