Installation guide

ADC Telecommunications, Inc.
74 C
HAPTER 3: RACK-MOUNTING THE SYSTEM
Rack-Mounting the Exhaust Plenum
You must mount a plenum directly above each chassis to guarantee the
minimum necessary air space of 2 U’s (3.5 inches) and ensure that adequate
air flows out of the system. A plenum functioning in this capacity is referred
to as an exhaust plenum.
For more information on the proper placement of system components in a
rack, see “System Placement in the Rack” on page 64.
CAUTION: If for any reason you are not using plenums, be sure to leave 2
U’s (3.5 inches) of vertical rack space where they would normally be
mounted.
Use this procedure to rack-mount the exhaust plenum:
1. Determine the placement of the plenum in the rack as described in
“System Placement in the Rack” on page 64.
2. Position the plenum so that the front panel is facing towards you and the
side stamped “THIS SIDE UP” is facing up.
3. Insert the plenum into the rack until the front brackets on each side of
the plenum meet the mounting posts, as shown in Figure 3-8.
4. Rest the plenum on top of the chassis to ensure an adequate seal
between the bottom of the plenum and the top of the chassis, as shown
in Figure 3-8.
5. While keeping the plenum flush against the mounting posts, position the
plenum so that the 4 holes in the mounting brackets are aligned with
those in the post.
6. Insert all 4 screws (2 on each side) into the bracket holes as shown in
Figure 3-8. Use the appropriate tool to tighten all the screws so that each
one goes through the bracket and into the rack-mount post.