IBM System Storage DCS3700 Installation, User's, And Maintenance Manual page 174

6. There must be adequate front and rear service clearances (in and around the rack or cabinet).
The rack or cabinet must have sufficient horizontal width clearance in the front and rear to allow the
drawer to be fully slid into the front and, if applicable, the rear service access positions (typically this
requires 914.4 mm (36 in.) clearance in both the front and rear).
If present, front and rear doors must be able to open far enough to provide unrestrained access for
service or be easily removable. If doors must be removed for service, it is the customer's responsibility
to remove them prior to service.
7. The rack or cabinet must provide adequate clearance around the rack drawer.
There must be adequate clearance around the drawer bezel so that it can be opened and closed,
according to the product specifications.
Front or rear doors must also maintain a minimum of 51 mm (2 in.) front, 203 mm (8 in.) rear, door to
mounting flange clearance, and 494 mm (19.4 in.) front, 571 mm (22.5 in.) rear, side-to-side clearance
for drawer bezels and cables (see Figure 91 on page 149).
8. The rack or cabinet must provide adequate front-to-back ventilation.
For optimum ventilation, it is recommended the rack or cabinet not have a front door. If the rack or
cabinet has doors, the doors must be fully perforated so that there is proper front-to-back airflow to
maintain the required drawer ambient inlet temperature as specified in the server specifications. The
perforations should yield at least 34 percent minimum open area per square inch.
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IBM System Storage DCS3700: Installation, User, and Maintenance Guide