Maintaining The Ex9253 Power System; Powering Off An Ex9253 Switch - Juniper EX9253 Hardware Manual

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• 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.
• EX9253 switches ship with one air filter. 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 EX9253 Power System

IN THIS SECTION

Powering Off an EX9253 Switch | 122

Removing an AC Power Supply from an EX9253 Switch | 124
Installing an AC Power Supply in an EX9253 Switch | 125
Removing a DC Power Supply in an EX9253 Switch | 127
Installing a DC Power Supply in an EX9253 Switch | 129
Maintaining Power Supplies in EX9253 Switches | 131
Powering Off an EX9253 Switch
Before you begin to power off the switch:
122