IBM NeXtScale System Planning And Implementation Manual page 146

Figure 5-7 Attaching the recirculation prevention plate
Note: In addition to the recirculation plate or stabilizer bracket, if a
recessed switch is in the U space 1, another seal kit (part number
00Y3001) is required to prevent air recirculation through the opening at the
front, bottom of the rack. For more information, see 5.4.3, "Rack options"
on page 135.
One-piece perforated front and rear doors with reversible hinges, so the doors
can be made to open to the right or the left.
Lockable front and rear doors, and side panels.
Height of less than 80 inches, which enables it to fit through the doors of most
elevators and doorways.
Reusable, ship-loadable packaging. For more information about the
transportation system, see this website:
http://ibm.com/support/entry/portal/docdisplay?lndocid=migr-5091922
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IBM NeXtScale System Planning and Implementation Guide
Recirculation
prevention plate