FATEK M Series User Manual page 30

Chapter 3 Installation and Wiring
3-2-2 Ventilation Space for Installation
The heat in M-Series PLC is ventilated via air circulation. There should reserve more than 20mm space,
both below and above PLC, and with vertical installation, for ventilation. as shown in the figure below:
M Series PLC installation direction
M Series PLC ventilation space
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M-Series PLC Expansion Module User Manual