IBM NeXtScale System Planning And Implementation Manual page 144

The rack features fully welded construction and is rated for a load of
953 kilograms (2100 pounds). The rack is one standard data center floor tile
(600 mm) wide, and 1100 mm deep. When the optional Rear Door Heat
Exchanger (which is described in 5.5, "Rear Door Heat Exchanger" on page 141)
is added, the rack is two standard data center floor tiles (1200 mm) deep. The
Enterprise V2 in the name signifies that it is IBM's second version of open
systems rack for the enterprise.
The base model of the rack comes complete with side panels. The expansion
model of the rack comes with the hardware that is used to join it to another rack,
and no side panels. A row of racks, sometimes called a suite, can be created with
one base model rack and one or more expansion racks; the side panels from the
base rack go on each end of the row. Figure 5-5 shows joining two racks. Racks
that are connected in this way match up with standard floor tile widths, which
does not happen by putting base model racks beside each other.
Figure 5-5 Joining two racks to make a row
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IBM NeXtScale System Planning and Implementation Guide
Openings for
passing cables
between racks
(updated rack has
four openings)