Clearance Requirements For Airflow And Hardware Maintenance For An Ex9253 Switch - Juniper EX9253 Hardware Manual

Clearance Requirements for Airflow and Hardware Maintenance for an
EX9253 Switch
When planning the site for installing an EX9253 switch, you must allow sufficient clearance around the
switch.
• For the cooling system to function properly, the airflow around the chassis must be unrestricted.
Allow at least 6 in. (15.2 cm) of clearance between side-cooled switches. Allow 2.8 in. (7.1 cm)
between the side of the chassis and any non-heat-producing surface such as a wall. See
page 54.
• 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. The switch 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. Care must also be
taken around cables to ensure that no leakage of air in situations where recirculation may result.
• To accommodate power cable bend radius at the rear of the chassis and the interface cable bend
radius at the front of the chassis, provide at least 2.75 in. (7 cm) at the rear and 3.5 in. (8.9 cm) at
the front.
• 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. (76.2 cm) in front of the rack and
24 in. (61.0 cm) behind the rack.
53
Figure 20 on