The following figure shows the ventilation when air is drawn in from the bottom.
Wall
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01
www.gkbpx.com
Exhaust air
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Modules
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Modules
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Supply air
Installing the S7-400
Cable duct or fan
subassembly
2-17