IBM x3100 M5 Type 5457 Installation And Service Manual page 108

2. After installing the system in a rack cabinet, the distance between the EIA
bracket and lower bezel will be roughly 67 mm. In light of this distance, please
make sure your rack cabinet door can fully close before you begin to install the
system in the rack cabinet.
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System x3100 M5 Type 5457: Installation and Service Guide