Juniper EX4300 Series

Back-to-Front Airow
In the EX4300 switch models that have back-to-front airow, the air intake to cool the chassis is
through the vents on the rear panel and hot air exhausts through the vents on the front panel of the
switch. See Figure 41 on page 88.
Figure 41: Back-to-Front Airow Through the 24-Port and 48-Port EX4300 Switch Chassis
You must install only power supplies that have AIR IN (AFI) labels in switches in which the fan modules
have AIR IN (AFI) labels.
Do Not Mix AIR IN (AFI) and AIR OUT (AFO) Components in the Switch
Do not mix power supplies and fan modules with dierent airow labels (AIR IN (AFI) and AIR OUT
(AFO)) in the same chassis. If the fan modules have AIR IN (AFI) labels, the power supplies must also
have AIR IN (AFI) labels; if the fan modules have AIR OUT (AFO) labels, the power supplies must also
have AIR OUT (AFO) labels.
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