Need help setting up fans

[thepowerofdonuts]

Hi. I have a crappy old computer that I'm fixing up for my mom. I just have no idea how to set up the fans. I have room for 4 fans, all 80mm. There is one front fan at the bottom, 2 side fans, also pretty low, and a rear fan right below the power supply (the psu goes at the top in this case). Which fans should be intake and which should be exhaust?

 

[mrplow99]

i think it should be all intake apart from the back one which should be more powerful. im not 100% on that but.

 

[Onus]

Front and sides (if any) intake, rear exhaust. The PSU is also an exhaust.
If this "crappy, old" computer doesn't create a lot of heat, you may not need to bother with the side fans, which may add more noise than they are worth.

 

[drumr1829]

Right, if there are settings I'd start by putting the front and side intakes to low and rear exhast to medium.... A 'balanced' air system is quietest....the intake fans' CFM's should equal the exhaust CFMs. Depending on your CPU you might be able to take out 1 or 2 of those fans....my old Dimension 4100 w/ Pentium 3 only had the CPU exhaust and the PSU fan. Didnt hear it at all...