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  1. In general, it is better to have the fan facing down (out of the PC case) so that you're drawing cooler air in - as long as the intake is filtered. If there's a lot of dust of other particles in the air (such as in a home with shedding pets), it's still ok to face it up if you have solid airflow inside the case.
    www.corsair.com/us/en/s/psu-family-builders-guide
    The answer is an easy one, should you have enough room between the intake and the floor (and your case has a grill on the bottom for a PSU fan to draw air) you'll want to have your PSU facing downwards. This will aid in the unit drawing in much-needed cool air when under load.
    www.windowscentral.com/does-it-matter-if-you-inst…
    According to Seasonic documentation, they actually recommend fan FACE UP if running in hybrid (semi-passive fan off mode) Natural heat convection will allow the air to drift upward when the fan isn't running. But the built in fan is strong enough to suck down any air and push it out the back when it runs in active (fan on) mode
    forums.tomshardware.com/threads/psu-fan-up-or-d…
    I have a 4000D and know for a fact that there are holes in the bottom and the PSU is intended to be mounted fan down. The 5000D is just a larger version, so it should be the same.
    linustechtips.com/topic/1398547-corsair-rmx-serie…
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  8. BUILDERS GUIDE - CORSAIR

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     · You can turn your PSU to have the intake fan pointing up or down. In general, it is better to have the fan facing down (out of the PC case) so that you're drawing cooler air in - as long as the intake is filtered.

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  10. Corsair 4000D Airflow Review - PCMag

    Nov 30, 2020 · Featuring a front panel covered in triangle perforations, Corsair's 4000D Airflow PC case has a distinctive-looking face and delivers what it promises: ample, well, airflow to keep your PC...

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