M320 Cabinet Airflow Requirements - Juniper M320 Hardware Manual

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M320 Cabinet Airflow Requirements

Copyright © 2010, Juniper Networks, Inc.
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Table 15: Cabinet Clearance Requirements (continued)
Mounting
Bracket
Position Front Clearance
11 16.88 in. (429 mm)
M320 Site Preparation Checklist Requirements on page 41
M320 Chassis Lifting Guidelines on page 216
When you mount the router in a cabinet, you must ensure that ventilation through the
cabinet is sufficient to prevent overheating. Following is a list of requirements to consider
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."M320 Environmental Specifications" on page 247 lists
the router's environmental specifications, including its operating temperature and
thermal output.
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 "M320
Cooling System Description" on page 37.
Install the router as close as possible to the front of the cabinet so that the cable
management system just clears the inside of the front door. This maximizes the
clearance in the rear of the cabinet for critical airflow.
If you operate the router in an enclosed 800-mm cabinet, you must install a baffle on
the inside of the rear door of the cabinet to prevent the router from overheating at
elevated ambient temperatures. The baffle separates the cool air intake from the hot
air exhaust in the rear of the cabinet (for baffle dimensions and location, see Figure 24
on page 48). We recommend that the baffle be made of soft foam with a depth of
2.25 in. (57 mm) so that it slightly touches the rear of the router when the rear cabinet
door is closed.
Route and dress all cables to minimize the blockage of airflow to and from the chassis.
Chapter 3: Preparing the Site for M320 Router Installation
Rear Clearance
13.82 in. (351 mm)
47