Cooling System - Juniper J4350 Getting Started Manual

J4350 and J6350 Services Router Getting Started Guide
router or disrupting the routing functions. To avoid electrical injury, carefully follow
the instructions in "Replacing Power System Components" on page 158.
NOTE: You cannot mix DC and AC power supplies in the same chassis.
WARNING: DC-powered Services Routers are intended for installation only in
a restricted access location.

Cooling System

The cooling system includes three fans at the rear of the chassis. The airflow
produced by these fans keeps router components within the acceptable
temperature range (see Figure 9). The speed of the fans is adjusted
automatically according to current temperature.
An air filter protects the air intake opening at the front of the chassis and must be
replaced periodically. For instructions, see "Replacing an Air Filter" on page 170.
The Routing Engine monitors the temperature of the router components. If the
ambient maximum temperature specification is exceeded and the router cannot be
adequately cooled, the Routing Engine shuts down the hardware components.
An additional fan is part of each power supply. This fan is not
regulated by the operating system.
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J4350 and J6350 Services Router Hardware Features