Jza

I've got two set up at the mo - both blowing air out at the back. I've realised this probably isnt the best setup. I've noticed that theres space to put two more fans at the front.... behind the front panel.

Should i set these to suck or blow. I reckon these should suck cold air in from the bottom front - the other two continue to blow out - from the top.

What do you reckon...?

Jza

DJ Dunk

iTrader: (5)

Yeah, IMO, low at the front sucking in and high at the back blowing out. Hot air rises, so cold air would be dragged through the case and expelled out of the top at the back.

Fig

Front fans drawing air in

Rear fans taking air out


4 fans = potential for lots of noise

Jza

I added an Aero 7+ CPU fan - the f*ckers so noisy already im not worried - even on low rpm its loud!!!

Jza

Hanslow

As DJ says, sucking low at the front, blowing high at the back.

As you know from your other post, I fitted 2 80mm fans, and it reduced ambient and CPU temps by 6 degrees both idle and under load. Not too noisy either. I ordered Vantec stealth ones and they aren't too much more noisy than what was already there.

Ordered from here, 1st class post, came next day http://www.overclockers.co.uk/acatalog/Vantec.html

Bumpster

I've got an Aero7+ as well. I have to have mine on full at the mo (need ot fit case fans!!) and it sounds like a plane taking off!

Made me laugh cause if you look at the box it says silent

Fatman

Draw the cold air in the bottom/front of the case and expel the hot air out the back/top. If fan noise is an issue, either replace the fans for better units or slow them down with a Fanmate (or similar).

mr-white

in at the front and out at the back. it will increase your air circulation and should lower your temps slightly

MW

Chris_

This does really depend on the type and layout of your case, however, the previous comments are generally true. Dont forget your other exhaust fan, the PSU

mr-white

you'll also get a quicker build up of dust inside the case with more fans

MW

Jye

Negative pressure is good, i.e. more blowing out than in or a higher volume of air shifted etc.

Jza

Right - ill get ordering more fans.

One thing. I dont have enough "power points" to connect two more fans to the PSU.. just one. Can you get some kind of splitter for the 80mm fan power supplies that lets me "fork" the power from one supply point to two fans?

URL anyone?

Jza

Jye

Good fans will come with a molex splitter.

http://www.kustompcs.co.uk/product.php?subcat=15

Hanslow

Jza, the fans I bought come with the splitter in the box

I imagine most do for the very reason you state

Fatman

Theoretically if you have below-ambient pressure in the case then you'll draw dust into the case. I'd suggest trying to keep the in-flow and out-flow pretty well matched.

Jye

True Fatman neg pressure will draw more dust into the case at the expense of slightly poorer case cooling. It really depends how dusty the environment is though.

Also remember the PSU fan will also be expelling air, so many people who think they are running positive pressure systems are not. To get decent cooling in any overclocked case, or a case with a lot of HD's etc you will need at least 2 80mm case fans exhausting and two on intake. This along with the PSU fan exhausting air means negative pressure anyway.

I live with the dust and clean my dust filters and PC's regualrly with compressed air.

Fatman

If it's anything like the room my PC lives in - very dusty! . I find that cleaning-out the Lian Li front filters on a weekly basis keeps the case clean enough inside.