Maintenance; Figure 38: Typical Open-Frame Rack - Juniper mx240 Hardware Manual

MX240 3D Universal Edge Router Hardware Guide
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Documentation
MX240 Router Clearance Requirements for Airflow and Hardware Maintenance
108

Figure 38: Typical Open-Frame Rack

Installing the MX240 Router Mounting Hardware for a Rack or Cabinet on page 165
Installation Safety Warnings for Juniper Networks Devices on page 422
When planning the installation site, allow sufficient clearance around the rack (see
Figure 39 on page 109):
For the cooling system to function properly, the airflow around the chassis must be
unrestricted. Allow at least 8 in. (20.3 cm) of clearance between side-cooled routers.
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
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