Power supplies can normally only be fitted one way, as the holes are not symmetrical. The fan should be facing upward if it conforms to normal standards.

Cases with bottom mounted PSUs like that are meant to have the PSU fan pull in cool air from below the case.

This way, the PSUI stays as cool as possible which also has the added benefit of making it last longer than if it were pulling warm air from outside the case.

To top it off, a newer case like that will have enough airflow through the case to keep everything else a lot cooler than an older style case. No reason whatsoever to have the PSU cool itself with warm air from inside the case.

Always insure the PSU fan blows out of the case, you don't want heat blown at the CPU. Silly.

Cheers,

debs3759 wrote on 2020-12-05, 23:17:

Power supplies can normally only be fitted one way, as the holes are not symmetrical. The fan should be facing upward if it conforms to normal standards.

Modern cases typically have two sets of mounting holes so you can mount your power supply in either orientation.

cyclone3d wrote on 2020-12-05, 23:25:

Cases with bottom mounted PSUs like that are meant to have the PSU fan pull in cool air from below the case.
This way, the PSUI stays as cool as possible which also has the added benefit of making it last longer than if it were pulling warm air from outside the case.

100% agree.

pete8475 wrote on 2020-12-06, 02:14:

Modern cases typically have two sets of mounting holes so you can mount your power supply in either orientation. […]
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debs3759 wrote on 2020-12-05, 23:17:

Power supplies can normally only be fitted one way, as the holes are not symmetrical. The fan should be facing upward if it conforms to normal standards.

Modern cases typically have two sets of mounting holes so you can mount your power supply in either orientation.

cyclone3d wrote on 2020-12-05, 23:25:

Cases with bottom mounted PSUs like that are meant to have the PSU fan pull in cool air from below the case.
This way, the PSUI stays as cool as possible which also has the added benefit of making it last longer than if it were pulling warm air from outside the case.

100% agree.

Agree that the particular case in the pictures is designed to have the fan aimed at the bottom,
but not all cases with bottom mounted PSU are designed to have the fan pull air from below the case, have one or two that have no vents below the PSU so the fan has to mounted pointing up or toward the front, depending on the PSU design...

debs3759 wrote on 2020-12-05, 23:17:

Modern cases typically have two sets of mounting holes so you can mount your power supply in either orientation.

Indeed, this is what threw me off, as this Rosswill case has two sets. ( https://www.amazon.com/gp/product/B01IT0TDY6/ ). I've since mounted it with fans facing downwards out of the case.