Juniper EX4300 Series

Table 7: Airow Direcon in Power Supplies for EX4300 Switches (Connued)
Power Supply
Rang
Label on Power Supply Direcon of Airow
1400 W AC
NOTE: Only
EX4300-48MP and
EX4300-48MP-S
switches support
1400 W AC power
supply.
AIR OUT (AFO) 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.
For more
informaon, see "Cooling System and Airow in an EX4300 Switch" on page 82.
CAUTION: Do not mix:
• AC and DC power supplies in the same chassis.
• Power supplies with dierent airow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
• Fan modules with dierent airow labels (AIR IN (AFI) and AIR OUT (AFO)) in the
same chassis.
• Power supplies and fan modules with dierent airow 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 eld-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 dierent airow direcons—back-to-front
airow, indicated by the label AIR IN (AFI) and front-to-back airow, indicated by the label AIR OUT
(AFO). See "Cooling System and Airow in an EX4300 Switch" on page 82.
24