Figure 29: Removing Fan Tray - Juniper MX2020 Hardware Manual

Copyright © 2013, Juniper Networks, Inc.
The cooling system components work together to keep all router components within the
acceptable temperature range. The router has four fan trays, two trays located at the
top, and two trays located at the bottom of the router that install horizontally. Each fan
tray contains six fans. These are labeled
fan trays are interchangeable and are hot-insertable and hot-removable.
Each fan tray has a double safety latch, so the fan tray cannot be removed in one swift
motion, (see Figure 29 on page
LED turns off. The secondary latch will engage during removal. Press secondary latch to
fully remove the fan tray. The double safety latch is described

Figure 29: Removing Fan Tray

WARNING: Before removing a fan tray, make sure the fan blades have stopped
completely.
The host subsystem monitors the temperature of the router components. When the
router is operating normally, the fans function at lower than full speed. If a fan fails or
the ambient temperature rises above a threshold, the speed of the remaining fans is
automatically adjusted to keep the temperature within the acceptable range, (see
30 on page 56 and Figure 32 on page
Chapter 2: MX2020 Hardware Components
through and are 172-mm in diameter. The
1 6
55). To remove the fan tray, press and hold the latch until
57).
inTable 24 on page 57.
Figure
55