Maintaining The Ex9214 Power System - Juniper EX9214 Hardware Manual

Purpose
For optimum cooling, verify the condition of the air filters.
Action
• Regularly inspect the air filter. A dirty air filter restricts airflow in the unit, producing a negative effect
on the ventilation of the chassis. The filter degrades over time. You must replace the filter every six
months.
CAUTION: Always keep the air filter in place while the switch is operating. Because
the fans are very powerful, they could pull small bits of wire or other materials into the
switch through the unfiltered air intake. This could damage the switch components.
• EX9200 switches ship with one air filter preinstalled. Spare air filters are separately orderable. The
shelf life of the air filters vary from two to five years depending on the storage conditions. Store
spare air filters in a dark, cool, and dry place. Wrap the air filters separately using plastic wraps and
store them in an environment with RH between 40% to 80% and temperature between 40° F to
90° F. Storing air filters at higher temperatures or where they can be exposed to ultraviolet (UV)
radiation, hydrocarbon emissions, or vapors from solvents can significantly reduce their life. If an air
filter develops flakes or becomes brittle when rubbed or deformed, you must not use it.

Maintaining the EX9214 Power System

IN THIS SECTION
Removing an AC Power Supply from an EX9214 Switch | 213
Installing an AC Power Supply in an EX9214 Switch | 216
Removing a DC Power Supply from an EX9214 Switch | 218
Installing a DC Power Supply in an EX9214 Switch | 221
Maintaining Power Supplies in EX9200 Switches | 223
212