The reason for this is so the psu intake fan will suck cool air into the unit from outside the case.
Case fan to psu.
Some computer cases come with a psu shroud or cover that acts as an extra protection for the power supply and also for the bottom mounted drives.
If your pc case has some sort of grill below where the psu sits then you should install your psu so that its intake fan is facing towards it.
Continue arranging cables and zip tying them to the case until you are happy with your result.
Psu connector is called molex and the fan connector is called 4 pin pwm but the thing is if you connect the fan to the psu directly your fan will run at max speed all the time so you cant change the rpm if you re okay with that then go ahead.
Yup connectors as labeled fan1 fan2 fan3 etc dont need to buy any molex cables and stuff right.
Line the screw holes in the fan up with the venting holes on the back of the case.
Yup just connect the fan controller to the two molex connectors as the fan controller gets power through 2 molex connectors.
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Attach the case fan to the vented rear panel.
Power down the computer and turn the power switch off on the power supply which is typically situated on the back of the computer tower near the ac power cord.
In other words your psu s fan will be facing downwards.
Some psu shroud do come with top vents that may allow you to position your psu fan up but if the bottom vents are given then it is better that you should keep the fan in.
Generally the psu shroud is a solid metal cover with no vents mostly so in such cases the position of the fan should remain down only regardless of anything.
These are 3 pin fans will they connect to this 4 pin speed controller.
Connect all the fan wires to the fan controller right.
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Zip tie them together to the back of the case to create a neat and slim prou001ffile.