Mx240 Router Cabinet Size And Clearance Requirements; Mx240 Router Cabinet Airflow Requirements; Figure 43: Chassis Dimensions And Clearance Requirements - Juniper MX240 Hardware Manual

MX240 Router Cabinet Size and Clearance Requirements

MX240 Router Cabinet Airflow Requirements

Copyright © 2019, Juniper Networks, Inc.
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: Chassis Dimensions and Clearance Requirements

The minimum-sized 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 several routers in a cabinet that has sufficient usable vertical space. Each router
requires 5 U.
The minimum total clearance inside the cabinet is 30.7 in. (780 mm) between the inside
of the front door and the inside of the rear door.
Before you install the router in a cabinet, you must ensure that ventilation through the
cabinet is sufficient to prevent overheating. Consider the following requirements to when
planning for chassis cooling:
Ensure that the cool air supply you provide through the cabinet can adequately dissipate
the thermal output of the router.
Ensure that the cabinet allows the chassis hot exhaust air to exit from the cabinet
without recirculating into the router. An open cabinet (without a top or doors) that
employs hot air exhaust extraction from the top allows the best airflow through the
chassis. If the cabinet contains a top or doors, perforations in these elements assist
with removing the hot air exhaust. For an illustration of chassis airflow, see
Figure 44 on page 148.
Chapter 2: Site Planning, Preparation, and Specifications
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