IBM NeXtScale System Planning And Implementation Manual page 158

Figure 5-16 shows the components of the IBM Rack and Switch Seal Kit.
Kit contains 12 pieces, enough for
six switches (two per switch)
Figure 5-16 IBM Rack and Switch Seal Kit contents
Figure 5-17 shows where these pieces are used.
Switch
seal
Figure 5-17 Placement of the components of the Rack and Switch Seal Kit
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IBM NeXtScale System Planning and Implementation Guide
Switch seals
Front-mounted
switch
Seal kit foam blocks
Switch seal
Seal kit foam blocks
Kit contains two pieces, enough
for one rack (two per rack)