It might have issues with vibration causing a bit of extra noise, probably as the plastic (stand) might not be 'square' (?) or it wasn't quite centred(?), put something softer under it for a bit and it eventually sorted itself out.
One and ones immediate cubicle neighbours will probably notice the sound on the highest speed but it shouldn't be super annoying. Airflow is good at both settings (and having an off switch is nice too).
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