Mitsubishi Electric 800 Series Instruction Manual page 33

 Arrangement of the ventilation fan and inverter
Heat generated in the inverter is blown up from the bottom of the unit as warm air by the cooling fan. When installing a
ventilation fan for that heat, determine the place of ventilation fan installation after fully considering an air flow. (Air passes
through areas of low resistance. Make an airway and airflow plates to expose the inverter to cool air.)
Inverter
<Good example>
Arrangement of the ventilation fan and inverter
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2. Installation and Wiring
2.3 Installation of the inverter and enclosure design
Inverter
<Bad example>