Juniper EX4300 Series Hardware Manual page 95

Table 28: Airflow Direction in EX4300 Switch Models
Model Number
EX4300-48T-DC-AFI
CAUTION: Do not mix:
• AC and DC power supplies 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 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.
(Continued)
Fan Modules and Power Supply
The switch ships with two fan
modules and a DC power supply,
each with a label AIR IN (AFI).
Direction of Airflow
Back-to-front—that is, air intake to
cool the chassis is through the vents
on the rear panel of the chassis and
hot air exhausts through the vents
on the front panel of the chassis.
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