Originally Posted by PP Mguire
Obvious answer. Down to suck in cooler air and blow the hot air out the rear. Why would you want to suck warm air in from your PC? It's the reason they made bottom mount PSU cases to begin with.
Not only that, but your cable bundle is in the correct position with the fan facing down.
Thank you for supporting my thinking that the fan should be oriented downward.
Here are the specific reasons why I chose to install the PSU with the fan oriented downward:
1. I desire cool air coming in from the bottom of the computer case rather than hotter air from within the computer case to keep my PSU at cooler temps.
2. Several bench-markers discovered an increase in the CPU temps after mounting the PSU with the fan oriented upward. Many people have posted complaints that a PSU installed with the fan oriented upward causes a disruption to the air flow within their computer case...
3. I do not have carpet in my computer room, so have need to worry about carpet fiber getting sucked into my PSU [and if I did have carpet, I would place my computer raised off the carpet with the fan filter at the bottom of the computer case in place].
4. Some computer cases come with a very, very nice PSU cover [HAF X]. The PSU cover that comes with the HAF X would completely cover the PSU fan vent hole if I were to orient the PSU with the fan oriented upward. This would lead to no air flow at all, and probably burn up my PSU very quickly!
5. If a screw or other tiny piece of metal ever came loose within the computer case, it could place my entire system at great risk if it fell into the PSU via the fan hole oriented upward rather than downward.
6. Several of the main PSU manufacturer's recommend the PSU to be installed with the fan facing downward.
Thank you for confirming I did it right.
I was a little confused because I read a number of posts at other forums where people were recommending the PSU be installed with the fan oriented upward. They even gave reasons why...