I was talking to one a certain individual and he said he uses a certain simple formula for identifying once a VFD panel will not be cooled enough by stirring fans (fans simply mounted inside closed enclosure with no air access to exterior) based on the size of the enclosure and the power rating of the VFD and maybe a couple other auxilary components I'm guessing.

Is there a certain formula methods used for this type of calculation?

At what point should forced ventilation be a concern?

Is there a certain formula methods used for this type of calculation?

At what point should forced ventilation be a concern?

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