Siemens SIMATIC S7-400 Installation Manual page 30

Installing the S7-400
Step 4: Mounting Additional Racks
For S7-400 assemblies containing two or more racks, make allowances for
additional clearance between the racks for installing a fan subassembly or cable
duct.
The figure below shows the clearance you must allow between two racks of the
S7-400 during installation.
110 mm
2-14
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Automation System S7-400 Hardware and Installation
A5E00850741-01