Maintaining The T4000 Fan Trays - Juniper T4000 Hardware Manual

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Maintaining the T4000 Fan Trays

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Copyright © 2013, Juniper Networks, Inc.
environment. The filter elements degrade over time, and replacement intervals will vary
by operating environment.
For procedures to replace the air filters, see the following topics:
Replacing a T4000 Rear Air Filter on page 220
Replacing a T4000 Front Air Filter on page 218
Replacing a T4000 Six-Input DC Power Supply Front Air Filter on page 264
Replacing a T4000 Six-Input DC Power Supply Side Air Filter on page 265
We recommend that you use spare filter elements within 1 year of manufacture. Check
the date of manufacture printed on the filter. Store spare filter elements in a dark, cool,
and dry place. Storing the filter elements at higher temperatures, or where they can be
exposed to ultraviolet (UV) radiation, hydrocarbon emissions, or vapors from solvents,
can significantly reduce their life.
CAUTION: Always keep the air filters in place while the router is operating.
Because the fans are very powerful, they could pull small bits of wire or other
materials into the router through the unfiltered air intake. This could damage
the router components.
T4000 Cooling System Description on page 21
Maintaining the T4000 Fan Trays on page 181
Troubleshooting the T4000 Cooling System on page 193
For optimum cooling, verify the condition of the fans.
On a regular basis, monitor the status of the fans. The fan trays each contain multiple
fans that work in unison to cool the router components. During normal operation, the
status of each fan is , and the fans in each fan tray function at normal speed. Use the
OK
show chassis environment
fans.
T4000 Cooling System Description on page 21
Maintaining the T4000 Air Filters on page 180
Troubleshooting the T4000 Cooling System on page 193
Chassis Operational Mode Commands
Chapter 17: Maintaining T4000 Router Hardware Components
and show chassis fan commands to verify the status of the
181