Juniper EX4300 Series Hardware Manual page 34

Table 7: Airflow Direction in Power Supplies for EX4300 Switches
Power Supply Label on Power Supply
Rating
1400 W AC AIR OUT (AFO)
NOTE: Only
EX4300-48MP and
EX4300-48MP-S
switches support
1400 W AC power
supply.
For more information, see
CAUTION: Do not mix:
• AC and DC power supplies in the same chassis.
• Power supplies with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
• Fan modules with different airflow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
• Power supplies and fan modules with different airflow labels (AIR IN (AFI) and AIR
OUT (AFO)) in the same chassis.
Fan Modules
In the EX4300 switches the fan modules are hot-insertable and hot-removable field-replaceable units
(FRUs).
All the EX4300 switch models, except EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-48T-S,
EX4300-48P-S, and EX4300-48MP-S switches are shipped with two fan modules preinstalled in the rear
panel of the switch. EX4300-24T-S, EX4300-24P-S, EX4300-32F-S, EX4300-48T-S, EX4300-48P-S, and
EX4300-48MP-S switches are not shipped with preinstalled fan modules; you must order the fan
modules separately.
The fan modules are available in two models that have different airflow directions—back-to-front
airflow, indicated by the label AIR IN (AFI) and front-to-back airflow, indicated by the label AIR OUT
(AFO). See "Cooling System and Airflow in an EX4300 Switch" on page
"Cooling System and Airflow in an EX4300 Switch" on page
(Continued)
Direction of Airflow
Front-to-back—that is, air intake to cool the
chassis is through the vents on the front
panel of the chassis and hot air exhausts
through the vents on the rear panel of the
chassis.
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