IBM NeXtScale System Planning And Implementation Manual page 155

The IBM 1U Pass Through Bracket is shown in Figure 5-13. The front for the
component has brushes to block the airflow around any cables that are passed
through it. It can also serve to block air flow around a switch that is recessed in
the rack (for cable routing reasons), that pass around a blank filler panel.
Pass through
bracket
M6 screws
Figure 5-13 1U filler with brushes, allows cables through but blocks air flow
(x4)
M6 Cage nut M6 Clip nut
(x4) (x4)
Chapter 5. Rack planning
137