My PSU makes a rattling sound when the fan is facing down?

Luke Bottomley

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Jan 24, 2014
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I have tested my PSU with both the fan facing down and facing up and after testing over time it seems to make quite a loud rattling noise when the PSU is fitted fan facing down.

My case does have a filter at the bottom of the case for facing PSU's down, so I was wondering as to why it only makes this quite ferocious rattling noise when its facing down this way.