Preventing the recirculation of hot air
Prevent hot air circulation outside the cabinet by leading the outgoing hot air away from the
area where the inlet air to the cabinet is taken. Possible solutions are listed below:
• gratings that guide air flow at the air inlet and outlet
• air inlet and outlet at different sides of the cabinet
• cool air inlet in the lower part of the front door, and an extra exhaust fan on the roof of
the cabinet.
Prevent hot air circulation inside the cabinet with, for example, leak-proof air baffles. No
gaskets are usually required.
The drawing below shows the air flow inside and outside the cabinet.
Air flow in1
Power module2
Hot air circulation to be prevented3
Air flow out4
Generic cabinet planning instructions 45
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