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A motor designed for 60Hz may draw excessive current if operated at 50Hz. So you need a fan rated for 50Hz.
I'm not sure why you say it's purely theoretical. I would think most commercial motors are designed as cheaply as possible with little margin. At a minimum, the motor magnetizing current will increase by the inverse ratio of the two frequencies, and that will certainly increase the power losses and motor temperature. But perhaps that would typically not be enough to cause motor failure.Generally it makes no difference at all - such concerns are purely theoretical, and assume that the motor is badly designed (already under too much stress at even 60Hz).