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Figure 20: Typical Open-Frame Rack
Spacing of Mounting Bracket Holes
The router can be mounted in any rack that provides holes or hole patterns spaced
at 1 U (1.75 in.) increments. The mounting brackets used to attach the chassis to a
rack are designed to fasten to holes spaced at those distances.
Connection to Building Structure
Always secure the rack to the structure of the building. If your geographical area is
subject to earthquakes, bolt the rack to the floor. For maximum stability, also secure
the rack to ceiling brackets. For more information, see “Rack-Mounting Requirements
and Warnings” on page 133.
Clearance Requirements for Airflow and Hardware Maintenance
When planning the installation site, allow sufficient clearance around the rack (see
Figure 21 on page 33):
■ 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
32 ■ Clearance Requirements for Airflow and Hardware Maintenance
MX240 Ethernet Services Router Hardware Guide