Juniper EX9214 Hardware Manual page 118

EX9214 Switch Hardware Guide
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If you are mounting the switch on a rack or cabinet along with other equipment, ensure
that the exhaust from other equipment does not blow into the intake vents of the
chassis.
Airflow must always be from front to back with respect to the rack. If the device has
side to rear airflow, then provisions must be made to ensure that fresh air from the
front of the rack is supplied to the inlets, and the exhaust exits at the rear of the rack.
The device must not interfere with the cooling of other systems in the rack. Fillers must
be used as appropriate in the rack to ensure there is no recirculation of heated exhaust
air back to the front of the rack. You must also ensure that hot air does not flow around
the cables.
For service personnel to remove and install hardware components, there must be
adequate space at the front and back of the switch. At least 24 in. (61 cm) is required
both in front of and behind the switch. NEBS GR-63 recommends that you allow at
least 30 in. (72.6 cm) in front of the rack and 24 in. (61.0 cm) behind the rack.
Rack-Mounting and Cabinet-Mounting Warnings on page 310
Rack Requirements on page 90
Cabinet Requirements on page 91
Cooling System and Airflow in an EX9214 Switch on page 43
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