Juniper MX480, Hardware Manual

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Allow 5.5 in. (14 cm) between the side of the chassis and any non-heat-producing
surface such as a wall.
• For service personnel to remove and install hardware components, there must be
adequate space at the front and back of the router. At least 24 in. (61 cm) is required
both in front of and behind the router. 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.
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 exhaust exits 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. Care must also be taken around cables to ensure that
no leakage of air in situations where recirculation may result.
Figure 43: Clearance Requirements for Airflow and Hardware Maintenance for an MX480
Router Chassis
See Also Installation Safety Warnings for Juniper Networks Devices
•
MX480 Router Cabinet Size and Clearance Requirements
The minimum size cabinet that can accommodate the router is 482 mm wide and 800 mm
deep. A cabinet larger than the minimum requirement provides better airflow and reduces
the chance of overheating. To accommodate a single router, the cabinet must be at least
13 U high. If you provide adequate cooling air and airflow clearance, you can stack five
routers in a cabinet that has at least 48 U (84 in. or 2.13 m) of usable vertical space.
The minimum front and rear clearance requirements depend on the mounting
configuration you choose. The minimum total clearance inside the cabinet is 30.7 in.
between the inside of the front door and the inside of the rear door.
Copyright © 2019, Juniper Networks, Inc. 148
MX480 Universal Routing Platform Hardware Guide