If you have a flat grille in the side that's up against the side fan, you can get noise from the fanblade turbulence interfering with the grille. This is why the better ones have round wire grilles.
@Emyr started
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If you have a flat grille in the side that's up against the side fan, you can get noise from the fanblade turbulence interfering with the grille. This is why the better ones have round wire grilles.