What kind of Airflow do you have in your Case ?

[lazerin]

..:Please reaply again to the real poll now that its up:.

Do you have positive (more air going in thatn out) or negative (more air going out than in) airflow in your case?

Just simply reply with a "Negative" or "Positive".

Lazerin.

p.s I coudn't figure out how to create a real poll. Is it possible to do? if so, please tell me how.

[nikhsub1]

Neither, I have true equalibrium bliss:D

[lazerin]

lol, kewl
I knew I forgot something. You can also just reply with "Equal", if you have equilibrium :D

[Colin]

Slightly positive with filtered intakes to keep the dust out.

[Malpine Walis]

Verly slightly negative pressure. Two big fans in and the same fans out. Plus the PSU out.

[MajinSSJVegetto]

I have 4 out fans, 1 in fan, and several larger open areas for air to enter.

[phantom punisher]

90% of the time im running a negitive setup. when gaming a fan comes on to put me very much positive. not an ideal setup but its quite when it needs to be

[hellrazrblade]

currently i have more air going in than out (POSITIVE), but because of my case design, pressure can easily stabilize via the front panel's vents. thats 2*39cfm in and 1*39cfm+psu out. new setup will be 39cfm+69cfm in and 39+psu+69cfm out which would be NEGATIVE.

[adamtekh]

positive baby !!!

my case runs 3c hotter with the side panel off:beer:

[Friend]

180cfm in...120cfm out...

Dust bunnies invade my case!!!!!

[Prisoner1138]

180 cfm in, about 140 cfm out. cant stand the dust from negative pressure and i get better temps with positive pressure anyways

[Kendan]

I like a little positive pressure.



And I PM'd a mod to make it a poll for you:D

[lazerin]

cheers:)

[-=UR=- Ranger]

Slighty negative!
100 cfm in
125 cfm out

[-=UR=- Ranger]

Slighty negative!
100 cfm in
125 cfm out

Using the same fans for in and out and PSU Fan also blows out

I´m going to add a blowhole in a sidepanel to get positive pressure

[packratbob]

side open so no pressure lol.

[Friend]

Originally posted by packratbob
side open so no pressure lol.

LOL!!!

[FIZZ3]

Haha negative, cuz my old PC has only the PS exhaust fan running. Runs fine too: 800EB@1000Mhz heh. =]

Dust is suxy though...

[Arkaine23]

Negative.

But with vents that have not been sealed, so I think the pressure is balanced.

[safemode]

I would really love to know how you guys are changing the pressure of your cases since it's not possible unless it's air tight and you're using a pump. Does nobody know how a fan works? Fans work by creating pressure differences of either side of the fan, the side with the low pressure is the side the air blows towards. Now we all know moving air is slightly lower in pressure than sitting air so if you have a strong current of air in your case then you have slightly lower pressure than the room it's in. But other than that it's not possible for fans to create low or high pressure. Nor does it matter if it's done via intake or exaust fans. Seriously, just stop and think about what you're saying. A fan cannot keep air out of a system nor can it push air into it, it just changes the pressure over the fins of the fan blades to cause the air to move in the desired direction. It cant change the pressure of the things around it.


Now if you are restricting intake then you will strain your exaust fans. The same is true for restricting exaust. But, you cannot restrict this flow by having a weaker fan or less fans on either side. Assuming the case is pretty much sealed except for the fan holes. If you had massive exaust and less so for the intake, then you'd be killing your intake because the exaust fans would be causing a flow of air in the direction the intake fan is trying to blow already. This means there is less resistance for the intake fan to rotate ( moving air == lower pressure) so it spins faster than it should and aids the breakdown of it's berrings. If you must have intake and exaust fans make sure they're far apart and have other openings in the case in places that do not wreck the flow of air you want to relieve strain on either your intake or exaust fans. Having both intake and exaust is actually bad because it's redundent. Only because you dont use ducts and it's hard to direct the air that is brought into the computer do we use intake fans at all. If you're going to use both though make sure you have another area of the case where air can freely enter and contribute to the flow of air you want or you'll just be killing some fans.

[lazerin]

sheesh safemode, take it easy.
i know its almost impossible to create real pressure inside the case using case fans, but this is just so i can see what sort of setup for airflow people have in their case.
however, it is still possible to create a little underpressure in the case if u have more fans pushing air out than in. when this happens, air will be sucked in through every gap in the case to try and equalise the pressure inside the case. (u probably already know that :) )

keep polling people :D

[ajrettke]

negative pressure

[lazerin]

here's a tally of how things r going

[FunkDaMonkMan]

Mine is a little positive. My processors run 4-5 degress hotter with the side pannel off.

[Friend]

To the ranting guy...MY case has enough positive pressue that air comes out the floppy slot!!! It "leakes" from every hole, seam and out the cd rom bay doors!

This may not be good but my case temps are about 6f above ambient as read from a dead spot.

just my 2c :D

[Bigsexy]

Case fan blowing in
CPU fan blowing out (if you count that as outgoing)
PSU fan blowing out

====>>>>> Negative!

[hellwolf]

neutral

92mm front intake
92mm back exhaust
80mm side intake
80mm top exhaust

[eobard]

Very negative with a cpu duct on the side.

[JSealy00]

slightly positive.

[lazerin]

.:bump:.
now this thread has been made a real poll! let's start again!!

[Mr. $T$]

tad +

[obliv]

slightly positive due to a pretty weak exhaust in a pci blower. 4-4 tho.

[Mike360000]

I love this little debate. It's been going on every since people started tweaking their airflow to their computers.

Early tweakers used to swear by by using a more negative pressure, and that seems to have been the case until the last year or so, when many have come to say they believe a little more positive is better.

I've always tried to use a little more positive myself, even though sometimes I wasn't in a position to. The trick I found out, only as of late, using positive case pressure, is the use of baffles in my case to direct my air flow. I force the airflow down onto the mob and to the v card. I also have a baffle directing some air to the cpu heatsink. You will not be able to as effectively use baffles to direct your air flow if you run negative case air pressure!

I am able to do this using one squirrel cage vent fan, the type used in laundry rooms and bathrooms. I have the air from it ducted into the back of my computer and then baffled to the different areas in my compter. In conjunction to the squirrel cage fan, I have 1 90mm intake fan case fan in the front of my computer.

For exhaust I have a twin 120mm HD bay cooler and two exhaust fans on my Enermax 465P ps. The HD bay cooler is set high in my case.

On both intake fans I use filter material to keep the dust out.

My cooling is DRAMATICALLY improved over regular air cooling, or the normal way my box and components was normally cooled. System temp under load went down from the low 50 c's to 29c. (That is within 3 to 4c of my ambient room temps.) My cpu is a little off though, not being the perfect oc'ing candidate. P4 1.8a @ 2323mhz @ 1.8v under load went down from the upper 60 c's to about 48c. (I'm using the Alpha 8942 heatsink/fan combo with a 48 cfm fan on it.)

My squirrel cage fan is hooked to a light rheostat letting me control the noise and airflow. My heatsink fan also has an adjustable rheostat allowing me to do the same thing.

I'll never run negative case pressure if I can avoid it.

Cheers,
Mike

[Handle]

Originally posted by safemode
I would really love to know how you guys are changing the pressure of your cases since it's not possible unless it's air tight and you're using a pump.

I'm not an engineer but I believe the fact there is airflow is proof that there is an air pressure difference between the inside and outside of the case. If they were in equilibrium air would not flow at all.:rolleyes:

I try to be positive about air pressure in my case. Five in, three out.

[lazerin]

wow! that sure is interesting mike:)
would u mind posting a pic of the inside of ur case?

[wildbilly2k]

i have postivtive presure to keep the dog hair out

[Mike360000]

You can go here to look at my pics:
http://forum.oc-forums.com/vb/showthread.php?threadid=95020

Scroll down to look at the early fan setup I used, before I went to the squirrel cage vent fan. I also have a pic of the air handling box I made for the back of my computer included.

Also read the 11th post up from the bottom on that page to see what I had to say about the baffles. I haven't any pics of that or my squirrel cage fan, but may try to do that shortly. Actually the baffle is quiet simple, a plastic gallon milk jug cut in such a way as to direct the air from the back of my computer, down onto the mob, with the plastic attaching to the h/f. There is a small overhang of the plastic, below the h/f, that forces some air to the v card and the rest shooting across the gap between my v card and h/f, straight towards the northbridge. My 90mm fan being at the bottom of my case, shoots air straight across the bottom, catching 2 HDs in the process. (They are mounted in the bottom of the case.)

One last note, my case is not all that big, which makes it a little harder to cool conventionally. It is an AOpen 602H, a super mid-tower. My air cooling setup has been more than adequate in handling my temps so far. My case is cramped from all that is in it. Which is all the more noteable on how well my fans are working!

Here is what is in this case:
P4 1.8a Northwood oc'ed to 2323 mhz
Abit BD7 Raid mobo Raid enabled
Aopen 602H case
Enermax 465P ps
2X120mm bay cooler
1X90mm front case fan
Squirrel cage fan ducted into back of computer
512 meg Powermem 2700 DDR CAS 2.5 1 stick
3 Maxtor ata 133 40 gig hd's.
1 Maxtor ata 100 40 gig hd
12/10/32A Plexy
Promise TX2000 Raid Controller
Kenwood 72X
LS-120
ZIP 250 USB
Dazzle 6 n 1 card reader
Creative Audigy sound card
PNY GF4 Ti 4400
Viewsonic PS 790
HP 5400 CSE scanner
Canon 6000 printer
Creative ES Go cam
Logitec iTouch cordless keyboard
Cirque Cruise Cat touchpad
Microsoft Optical USB mouse
Speedstream DSL
Logitec FF Wheel
MS Precision Pro joystick
All on WinXP


Cheers,
Mike

[pby5cat]

negitive :eek:

edit about equal now that i have my side case fan:D

[wildfrogman]

slightly negative, 304cfm in 310 cfm out, 2 172mm 235 cfm commair rotron fans one intake side panel above cpu area and one exhaust lower front. 1 69 cfm 80mm delta on video card over pci area blowing in. 1 92mm blow hole 50ish cfm blowing out and the PS fan around 25 cfm i think blowing out. A bit loud but nothing some good headphones cant handle as long as its not on my desk my my head.....heheh. Oh and one thing on fans not able to produce pressure.......you never have dealt with 172mm comair rotron fans before eh? Beleive be the produce ALOT and the airflow~pressure drop tables will show you how much so. Hear is for one for majorDC fan http://www.comairrotron.com/dcfans/MajorDC.htm and this is for my patroit fan http://www.comairrotron.com/dcfans/PatriotDC.htm and DELTA has specs on all their fans also on their website. Its worth it to check the static pressure on fans....as the higher pressure fans do work work per cfm than other fans that have alot less static pressure.

[crucial]

quite positive :D.. doing some base mods at the moment.. but at last moment i had 1x120, 3x80 going in, 1x80 and PSU fans out.

also have a duct on the side for fresh air to my delta.. so thats another 80mm in :D (just realize i prolly need a few exhaust fans)

[Mr_Scrub]

Positive

[wildfrogman]

I have found out also if fans are operating as close to balanced airflow they are not as loud since they arnt working as hard. Also yeah if the air cant get out fast enough to high positive pressure wont help you out. I have found a slightly negative air pressure with all vents~sides of case~holes tapes,plugged etc sealed except for where i want air to come in helps focus the cool air coming in. Possitive airflow isnt bad performer either as long as you have enough of it for your system and a decent amount of exhaust and possibly baffles like a few posts ago mentioned.

[Mike360000]

"I have found out also if fans are operating as close to balanced airflow they are not as loud since they arnt working as hard."

There would have to be an awefully close balance between the positive and negative flows for this to be realistic. Then you have to consider on how you want each fan to direct its' airflow. Kind'of putting you at the mercy of the eddies and currents.


"Also yeah if the air cant get out fast enough to high positive pressure wont help you out."

That depends on how much air is moving out in the first place. With an open system or shall we say a box with many holes, it is advantageous for the positive pressure.

"I have found a slightly negative air pressure with all vents~sides of case~holes tapes,plugged etc sealed except for where i want air to come in helps focus the cool air coming in."

Right that would be how I understand negative air pressures to work best in a computer box. Again however, you have to pay attention as to how best to direct the air-- What you can do concerning fan positions.

Cheers,
Mike

[sillyunclemark]

I think this counts as slightly positive. :D
1 80 cfm blower in with filter.
2X6 exaust port below psu

[wildfrogman]

"That depends on how much air is moving out in the first place. With an open system or shall we say a box with many holes, it is advantageous for the positive pressure." Yep, you could just make vents above the agp~pci~anywhere you need airflow out to help equalize your case pressure and would be cooler also. I emagine you will have fun adding vents or already have? enjoy:cool: all i was meaning was if a case had hardly any exhaust holes~vents etc enough so to drop the fans cfm that are blowing in it will not be as good as it could be effeciency wise. Sure if you get 200cfm hundred cfm in and only 100~ out you could gain an extra 100cfm if it was balanced thats all.

[TheGhengisKhan]

Positive!!
2 80mm 39cfm fans out + weak PSU fan (all top-back)
2 80mm 42cfm fans in (window over vid + cpu), and 1 120mm 240cfm 115V monster intake (bottom-front)
went through my case and sealed up the extra holes, to allow me to chose how the air flows through my case
All this in my Antec full-server tower case.

[Mike360000]

OK I posted my pics of my squirrel cage fan and baffle.
Go here on the 2nd page of the thread to view.
http://forum.oc-forums.com/vb/showthread.php?postid=892245&t=4449#post892245

Cheers,
Mike

[lazerin]

kewl :)

[Rotary-Motion]

4 x 80mm sucking out none putting in, just a 110 mm square hole cut out the front, its like a dam vacuum cleaner!!! put the mouse next to it and its gone up to the psu black hole :D :D :D

[Mike360000]

Originally posted by Rotary-Motion
4 x 80mm sucking out none putting in, just a 110 mm square hole cut out the front, its like a dam vacuum cleaner!!! put the mouse next to it and its gone up to the psu black hole :D :D :D

phew... ain't no telling what kind of creatures you got roaming around inside your box, that's been sucked inside! :D

lint balls, dog or cat hair, maybe even the animals themselves, fuzzies, mice, dust...... P-U!

Cheers,
Mike

[ozzlo]

When i was running my p4 without a cpu fan

geez don't mob on me yet let me finish

i had bolth side pannels off and a huge 2 1/2 foot box fan cooling my computer

funny thing is is that it was only running about 3c cooler with the boxfan cooling it than without and a cpu fan

now im dooin 3 fans in 1 fan out and soon to have a 4 inch blow hole in the top

[Mike360000]

Regardless whether it is positive, negative or neutral air pressure inside your box, the thing to remember is to use what always works for you!

Cheers,
Mike

[Rotary-Motion]

Originally posted by Mike360000


phew... ain't no telling what kind of creatures you got roaming around inside your box, that's been sucked inside! :D

lint balls, dog or cat hair, maybe even the animals themselves, fuzzies, mice, dust...... P-U!

Cheers,
Mike

Hi

thats right! but what i didnt say is the 110 hole is for the rad on my new water cooling rig i'm waiting for to turn up! which will have a 120mm fan blowing in! and i'm going to rheo the fans to reduce air suck... to get to a stable equilibrium! in case which will hope fully make a equal air flow no neg pressure or pos pressure?

well thats the idea?

thx..........

[Rotary-Motion]

my GOD Mike360000

i have just looked at those pics of yours!

WOW and double WOW its like invasion of the body snatchers!!

its ALIEN 4 revisited,

quatermass and the pit!

The day of the triffids!

:D :D :D

[Mike360000]

Sounds good!
I have a rheostat on my squirrel cage fan, but I always run it with positive pressure. Good luck with the rest of your project!

Cheers,
Mike

Originally posted by Rotary-Motion


Hi

thats right! but what i didnt say is the 110 hole is for the rad on my new water cooling rig i'm waiting for to turn up! which will have a 120mm fan blowing in! and i'm going to rheo the fans to reduce air suck... to get to a stable equilibrium! in case which will hope fully make a equal air flow no neg pressure or pos pressure?

well thats the idea?

thx..........

[Rotary-Motion]

Originally posted by Mike360000
Sounds good!
I have a rheostat on my squirrel cage fan, but I always run it with positive pressure. Good luck with the rest of your project!

Cheers,
Mike



hi mike

yeh cheers for that nice one, i hope it all works somewhere near, its my first step to overclock! just need the cooler then i can wind up the amps on this rig and have some fun...

all the best

Paul...:burn:

[jaideep]

hey im kinda new in here and my systems kinda new,too...i have negative air flow...and the weather where i am here is very hot and its dusty too...most of my friends keep their casings open,but im terrified of dust...whats the best way for me to keep my cpu cool AND withstand dust? please help!

:(

Athlon XP1800+
512 DDR RAM
GeForce 4 MX440
ASUS A7v333 MB

[Mike360000]

Rotary-Motion and you inparticular need to go to the link I listed above. Here it is again:
http://forum.oc-forums.com/vb/showthread.php?threadid=95020

Also look at my last pic in that thread, at how I have a filter over my squirrel cage fan. If you read the full thread, I'm sure you can get some ideas on how to keep the inside of your box clean. My box has stayed consistently clean running positive pressure.

Cheers,
Mike Lamb

Originally posted by jaideep
hey im kinda new in here and my systems kinda new,too...i have negative air flow...and the weather where i am here is very hot and its dusty too...most of my friends keep their casings open,but im terrified of dust...whats the best way for me to keep my cpu cool AND withstand dust? please help!

:(

Athlon XP1800+
512 DDR RAM
GeForce 4 MX440
ASUS A7v333 MB

[---X---]

I would run at neutral, but the front intake of this Gateway is a bit tricky so I could only expand it to 92mm, and then I have a 120mm exhaust right behind the HSF...I wonder why Gateway put in these fan mounting spots but no fans :confused:

[wildfrogman]

The front lower fan in some computers with very very restricted airflow in the front bezel maybe to just stir up the air a bit? It has to do atleast a little good as an oem wouldnt spend money on a fan unless they HAD TO. Just a thought, but it makes sense as they dont want to replace stuff the first year for heat related problems.......after the warreny runs out they hope you just buy a new one.

[wilhelm310]

positive air flow for me 4 80mm in 1 80mm out

[lazerin]

Negative airflow seems to be the way to go according to the poll.....dont' shoot the messenger:D

[Mike360000]

Originally posted by lazerin
Negative airflow seems to be the way to go according to the poll.....dont' shoot the messenger:D

Well, like I said, what ever works best for each individual.
However you gotta remember, negative case air pressure has been recommended and pushed from the earliest days of PCs. I remember a time when positive case air presssure was frowned upon. So I would say it is normal to see more negative pressures listed than positive. Old habits die hard! However times and beliefs do change, and we are actually seeing quiet a few positive listings. People mostly run what ever is the favored methods of the day, according to the science of the day. At least now some studies and claims are stating that positive is better. What tomorrow brings I haven't a clue, except it will be something different.

Cheers,
Mike

[SkiFletch]

pretty heftily negative

[Rotary-Motion]

hi all

just a thought you know but i was waying up this case pressure yet agian and some thing struck me (scary) ok picture this i got 4 fans sucking out and a dirty big hole in the front, is the hole enough?

cos the PSU fan is queit and slow yes, so if you got all that suck from the other fans it might over power the little fan rpms and start sucking in through the psu 4 against one is bad odds in my book!!!

ok but this all depends on how big a hole i got in the front but if i didnt have much of a big hole then it would suck the psu air into the case yeah ??? so i think you need more going in thean out or a stable equilibrium???

just the thought of the day guys

(wish this dam water kit would turn up 5 weeks now DOH:mad:

thx.............

[SniperXX]

POSITIVE -- Till I fully WC my WHOLE system Except for my PSU! :cool:

Later :burn:

[HGREENIII]

my airflow is as even as posible two 80mm in two 80mm out (not including psu) all same cfm

[lazerin]

Only negative airflow works for me now. If I have my case open, my CPU temps rise by 3°C

[grim]

equal

[paulie]

WAY positive for me:
~130cfm intake
~90cfm exhaust

Is my much lower exhaust limiting the potential of my intake?

[EgeWorks]

equal, with dust filters over all intakes.

[CPFitz14]

hmmm..... barely any airflow doesn't seem to be a choice.:beer: I guess I'll go with negative.(1 in, 1 out, plus PSU out.)

-CPFitz-

[masitti]

I have 1 86 CFM in, and 3x 34 CFM out.

Which is that?:confused: :eh?: ;)

[DarkJediSleikas]

One intake and one exhaust (both 80mm), but my exhuast fan in the back is ducted to my heatsink, so it loses some airflow by having to suck around a heatsink. Result: slightly positive.

[CrystalMethod]

I'm ever so slightly onthe positive side.

[TheSanch]

I just have the whole side off my case, don't know what to call that. hehe.

[Fedorenko]

Negative

1 in, 10 out

[Malakai]

equal here.

i have 2 48cfm intakes, 2 30 something cfm outtakees, plus a 20 something cfm outtake.

i try to keep it reasonably balanced

[lazerin]

msmasitti, i believe u have negative airflow :)

[DarkArctic]

Neutral.

I have no case fans as of now. I don't need them yet, the case is too small and I have water cooling so case temperature doesn't effect it much.

-DarkArcitc

[maxima88]

Very positive airflow. Keep my study room temp at 18c so there's a lot of cold air going in. Looks like it works.

[dansonang]

Positive

[lazerin]

nice avatar dansonang:)

[DAGO]

Definately POSITIVE...:D

[Spec_Ops2087]

I got 100cfms going in and 118cfms going out...so negative for me



Spec

[lazerin]

c'mon people! more negative!! negative all the way baby!

[MoonWolf]

I found my system temps dropped by 4 degrees if I had the two fans in the back of my case blowing out, one on top of my case blowing out, and the one on the left side of my case blowing in right onto my HSF.

[Maxvla]

i guess having a huge house fan blowing in my side panel counts as positive :o

[DreamingWolf]

I'm not sure about the CFM but I think slightly negative.
2X80s in, 2X80s out, 2X bay fronts in (the ones with the triple baby fans), PSU out (Antec 430 True power has 1 sucking in from the case and 1 blowing out the back) and PCI slot blower just below my vid card to void that heat.:cool:

[Cowboy X]

Positive Balance overall

Out

1/ PSU fan

2/ 80 mm case fan

In

1/ 80 mm case fan

2/ 120 mm 110 cfm Sunon :D


Neither

1/ 50 mm fan on Northbridge

2/ 60 mm noisy Delta on CAK 38 heatsink

[PigGuy]

I like to open my case and find that it is not dusty. If you have positive airflow, almost all the air that gets in goes through the air filters (if you are smart enough to have them).

[Nico3k]

ummm.... no case right now :D

[RideGuy]

Originally posted by safemode
I would really love to know how you guys are changing the pressure of your cases since it's not possible unless it's air tight and you're using a pump. Does nobody know how a fan works? Fans work by creating pressure differences of either side of the fan, the side with the low pressure is the side the air blows towards. Now we all know moving air is slightly lower in pressure than sitting air so if you have a strong current of air in your case then you have slightly lower pressure than the room it's in. But other than that it's not possible for fans to create low or high pressure. Nor does it matter if it's done via intake or exaust fans. Seriously, just stop and think about what you're saying. A fan cannot keep air out of a system nor can it push air into it, it just changes the pressure over the fins of the fan blades to cause the air to move in the desired direction. It cant change the pressure of the things around it.


Now if you are restricting intake then you will strain your exaust fans. The same is true for restricting exaust. But, you cannot restrict this flow by having a weaker fan or less fans on either side. Assuming the case is pretty much sealed except for the fan holes. If you had massive exaust and less so for the intake, then you'd be killing your intake because the exaust fans would be causing a flow of air in the direction the intake fan is trying to blow already. This means there is less resistance for the intake fan to rotate ( moving air == lower pressure) so it spins faster than it should and aids the breakdown of it's berrings. If you must have intake and exaust fans make sure they're far apart and have other openings in the case in places that do not wreck the flow of air you want to relieve strain on either your intake or exaust fans. Having both intake and exaust is actually bad because it's redundent. Only because you dont use ducts and it's hard to direct the air that is brought into the computer do we use intake fans at all. If you're going to use both though make sure you have another area of the case where air can freely enter and contribute to the flow of air you want or you'll just be killing some fans.

You need to relax dude. I don't think everything you have written here is entirely accurate. All I know is that my comp has never run cooler and cleaner. 2 intake fans on the front, 1 exhaust on the back. POSITIVE PRESSURE! In some spots on my case I can feel the air coming out.

I used to have only 1 intake fan on the front and clean out the dust bunnies every couple months. No more.

Safemode, I think your biggest problem is that everyone else who has poled in this thread understands what Lazerin meant by positive/negative pressure except for you.


Paul

[lazerin]

Originally posted by RideGuy


You need to relax dude. I don't think everything you have written here is entirely accurate. All I know is that my comp has never run cooler and cleaner. 2 intake fans on the front, 1 exhaust on the back. POSITIVE PRESSURE! In some spots on my case I can feel the air coming out.

I used to have only 1 intake fan on the front and clean out the dust bunnies every couple months. No more.

Safemode, I think your biggest problem is that everyone else who has poled in this thread understands what Laserin meant by positive/negative pressure except for you.


Paul

Thats Lazerin thx ;)

[RideGuy]

Sorry LaZerin, I fixed it.

[lazerin]

cheers :D

[lazerin]

.:bump:.
lets see some more negative

[Deadphishy]

i have very negative 3 outs and no ins but i do have holes with filtters to let air in. case temp rises about 3-5 deg C when the side is removed.

[Rbreb13]

On system 2: Close to Neutral, about 150cfm in and 152 cfm out. Not counting the PSU.

[RideGuy]

I brought this thread back to life.

[SemiCycle]

Negative here. About :

150CFM out
90CFM in

[chrismacan]

Originally posted by Colin
Slightly positive with filtered intakes to keep the dust out.

Exactly the same here. 2 x 120mm in, 2 x 92mm out, PSU fans and slot cooler for RADEON 8500.

I have dust filters on the 120mm. Nice clean case inside even after six months of use without ANY cleaning. Every two or three weeks I use the vacuum cleaner to remove the dust on the 120mm. I have the filters installed between 2 grills on the outside of my case.

I have about 300 CFM in and about 240 CFM out.

[Loyalty]

Barely negative. 4 80mm as intake. 2 120mm and the PSU as exaust.

[Wommalong]

very little...lol;)

[Gravity Man]

Positive. 2 medium airflow 120mm fans and whatever is in my powersupply out, 2 YS-Yech 131 CFM 120mm fans and a Sanyo Denki 55 CFM 92mm fan in.

[rustymaitland]

4 y.s. tech case fans---2 front, 2 rear = 56cfm each.

smart fan II off of a V9 installed on an ax-7.

looking to upgrade all case fans to tornados. even the cpu.

me no care about noise.:D

does the dual p.s. fan count? if so, count it.

[KfistoRok]

Negative.

Intake: 1 80mm smart fan 2
Exhaust: (2) 80mm vantec stealths, 80mm psu out, 3 fan hdd cooler in top bay

I'm fixing to try a duct from my intake fan to my cpu fan. Excited to see how that will work, although i'm not going to be happy to see a huge duct in my window, but if my temp drops enough I'll keep it. I've read ducting to the heatsink/cpu fan can drop chip temps up to 10C.

[JimboZ88]

i have no airflow at all. I have my case open, and my junky fan on the PSU blowing out air that is the same temp as the room it's in... I am proud...:rolleyes:(cough)...

Ps. I HAD a 39cfm 80mm sunon for an intake, but realized that no holes in front of fan=no air being moved!!!... MUST DRILL HOLES!

[Mike3597]

Dual 120mm. Vanteck Stealths' In
Dual 80mm. Cheap O's Out

[Ugmore Baggage]

Almost no pressure at all due to almost no fans due to being too lazy to actually overclock. Also, the rather big (3"x5") front opening/vent doesn't cause much resistance.

[Nebulous]

Positive here:
2-92mm's front @ 52cfm ea
1-80mm side@ 51cfm
2-80mm smartfans rear @ 53cfm ea.


155cfm's intake
106cfm's exhaust

Also my case temps are about 5-10c cooler than ambient

:D

[Lord Moreira]

if u have 2 fans in the back of the case would it make sense to make 1 as intake and the other as exaust?
I get the best temps with all as exaust except for the front fan.
My case has a lot of holes on both side panels (built in)
i also have 1 on the side panel and 1 on the top , again all blowing out

[The Spyder]

none~ not ONE fan in one of my PC's~ all watercooled~ the fans/rad are outside- the harddrive/CPU/GPU and soon powersupply are watercooled and the rest is passivly :)

[The Spyder]

Originally posted by Thundr7
Positive here:
2-92mm's front @ 52cfm ea
1-80mm side@ 51cfm
2-80mm smartfans rear @ 53cfm ea.


155cfm's intake
106cfm's exhaust

Also my case temps are about 5-10c cooler than ambient

:D
you forgot you powersupply out.....

[specific]

3 in, 3 out
slight positive pressure

in:
1)5.5 front bay (consists of 3 little fans)
2)side 80mm
3)rear 80mm

out:
1)top 80mm
2)rear 80mm (exhaust duct goes to hs)
3)psu (regulated with speedfan)

[GHOST_Viper]

http://www.procooling.com/articles/html/5_myths_about_cooling__-_phaes.shtml

Check out Myth 5

-Jason

[HighLife]

1-80mm fan in front of case sucking in.
1-80mm Rear of case blowing out.
1-80mm On top Blowhole blowing out
1-92mm Side panel blowhole blowing air on my CPU
1-92mm in a duct (www.2coolpc.com)

[specific]

GHOST_viper

Positive case pressure has led to a two degree drop in temperature for my case and cpu. The reason is that more air is forced through the cpu fan. Since that is the most powerful fan inside the case, it benefits from positive pressure by the fact that it doesn't have to fight for air. Negative pressure is a situation where air is pulled into the case through any passive holes. I'm sure you know this, but bear with me. Positive pressure feeds more air to the inside of the case than it can use, and that extra psi is released through passive radiation, but also flows through the hs fan.
pp is like blowing air through your fan
np is like sucking air away from your fan
my temps were measured through much trial and error.

ps my system is not loud at all. my cpu fan speed is only 3400rpm. my case fans are <2000rpm (except for the psu which is 2100rpm). pretty cool, too.
presently 32sys/38cpu idle, +2/+5 load.

i'm a believer in positive case pressure. it's not a myth. it also only helps keep dust out of your system if you use intake filters.

--specific

[bknight]

1 80mm out
1 80mm in
1 80mm side

[Lithan]

Positive. Air flows out the vent holes in my case just above my cards... which i image is pretty nice for cooling

[ziah]

well i have a 60mm on my cpu and a 90mm case fan screwed to me vid heatsink. needless to say hardly any airflow at all. so i keep the side open 24/7

~z

[chrismacan]

Originally posted by specific
GHOST_viper
i'm a believer in positive case pressure. it's not a myth. it also only helps keep dust out of your system if you use intake filters.

--specific

You are quite right about that. One year running with 2 x 120mm intakes and 2 x 90mm exhaust and filters on the 120mm's and I have a clean case. I can barely pickup any dust anywhere inside my case. Of course my converted furnace air filters are almost black with use. Gotta wash them every 2-3 weeks. I also smoke in my office right in front of my tower. The office doesn't smell as bad as it used to.:p

[Lithan]

WOOT for furnace air filters! WOOT! Halleluia Brother!

[markst1]

Originally posted by wildbilly2k
i have postivtive presure to keep the dog hair out

Excellent reason! Although I'm running mine with the sidepanel off, I can see where a positive internal pressure would keep the blasted dog's hair out. But you'd definitely have to use a filter for EVERY intake fan. Strong case for using only one single intake fan, and for making a filter bracket for that fan that makes filter changing easy.

[Mike360000]

Originally posted by GHOST_Viper
http://www.procooling.com/articles/html/5_myths_about_cooling__-_phaes.shtml

Check out Myth 5

-Jason

The real myth is the one of negative case pressure being better.
The only real problem of positive case pressure, and why major companies don't employ it, is it takes more precise directing of the air through the case. Most all times baffles are needed to get the most from the positive pressures. But I would think that some people would actually do better with negative pressures, as nothing is written in stone.

I was caught up with the negative case pressure ploy for years, and it used to be a BIG no no for anyone to even claim its' use. Finally out of necessity I tried it. At least peeps don't down others now for running positive pressures! I'll never run negative case pressures again, unless for a specific reason.

Cheers,
Mike Lamb

[Needitcooler]

My rig is about to take off into orbit. There is so much air blowing out it is incredible. My cat walked by an exhaust vent, and she went sliding across the hardwood floor.

[King Zielke]

positive 1 case fan pulling air in

[Voodoo Rufus]

120mm and 80mm intakes, 92mm exhaust and 80mm PS exhaust. Someday to have a 120mm exhaust instead of the 92. Me no like dust.

[flixotide]

56,5 cfm's inwards, 48,7 cfm's going out...

1 120 mm Pabst bottom mounted intake
1 80 mm pabst rear mounted venting out
2 60 mm pabst on the cooler venting inwards towards the heatsink and pressing air outwards through a duct.

Works neatly, all packed in a microatx cabinet..

Cheers, Flixotide

[seeker]

POSITIVE... dust sux :)
2 120's @6v w/filter on left side panel
ps exhaust
right side panel off

[effekt]

slightly positive, 2x 80mm antec smart fans exhaust, 2x 80mm smart fan intake, antec 80mm side pannel intake, and psu out,
slightly positive, i try to keep it really balanced, with side panel off i get about 1 c hotter in there.

[Axle]

none? I have no case fans...

[crotale]

2 blow out @ back
1 in @ HDD's
1 in @ side
PSU out.
All 80mm...

[svenrune]

Positive 4*80mm Enermax in, 2*80mm Enermax + psu 80mm out.
Have 2 dog's

[lazerin]

.:bump:.

[centered effect]

kinda nuetral air flow
3 intakes
1 exhaust
2 psu fan exhausting

[The VTech]

3 in 3 out all the same size. Pretty close to neutral I'd say eh?

[flapperhead]

a boxed cold air ducted system, lian li case, 2x130 cfm in 2x130cfm out. works great.

[/\\/3|2o]

i thiunk its good to have a positive airflow because some of the hot air can come out of the holes in the case. It doesnt have to go through the fans.

Edit: hey if i have a positive airflow would it keep out dust?

[lazerin]

Yes, positive pressure will lower the amount of dust that enters your case in comparison to negative and neutral.

[The VTech]

Good point. Also filters help out a lot and if you get the good ones for a few bucks, you don't loose that much flow.

[litghost]

actually when i take my filter off, i lose 5 degrees case temp and 2 in cpu, but the dust isnt worth it

[Mike360000]

It is heartening to see old habits and thoughts change, in this case. As I said way back in this thread, I ran positive case pressure when it was the *out*, er odd thing to do. And I caught flak for it! I'm glad people are seeing the benefits of positive case pressures in spite of what some *authorative* websites claim!

As for filter material, all you need is some cheese clothe or dress backing material to make a real good filter. I use the dress filler material and it only costs me 98 cents a yard at Wally World. You can really tell what you've kept out of your computer case after running it for a month or two. Phew.............

Cheers,
Mike
PS Look back at my pics and you can see the material.
Actually here:
http://forum.oc-forums.com/vb/attachment.php?postid=892245
and
http://forum.oc-forums.com/vb/attachment.php?postid=776630
and
http://forum.oc-forums.com/vb/attachment.php?postid=892235

Actually with my new mobo and a P4 2.53 cpu oc'ed to 3.02 ghz my cpu idle temp is 31c load is no more than 43c
system temp idle is 27c and under load is 33c
This is with the same case and cooling equipment I listed above, earlier.

[lazerin]

Personally, I find that filters all tend to limit airflow enough that it impacts on my temperatures. So I'd rather just get a can of compressed air for $1 and clean out the case once a month or more, never less.

[Mike360000]

Originally posted by lazerin
Personally, I find that filters all tend to limit airflow enough that it impacts on my temperatures. So I'd rather just get a can of compressed air for $1 and clean out the case once a month or more, never less.

Depends on what you have blowing the air in to begin with!
I find all the computer case fans will reduce their airflow if anything is restricting them, if anything is directly in their airflow path, anything at all. Not so with my setup!
Also one only needs a really fine piece of webbing material to begin with, like the dress backing I mentioned above.

Cheers,
Mike

[minoukat]

One fan (power supply exaust fan lol) that exausts the air. that's it. my airflow's pathetic. it's negative.

[Vertical_Zer0]

Lol... I just cut out my fan grill for my exhaust fan under my PSU (not the psu fan, a different one). My case AND core temps lowered by 4c!!!!! I was shocked!

[Mike360000]

Originally posted by Vertical_Zer0
Lol... I just cut out my fan grill for my exhaust fan under my PSU (not the psu fan, a different one). My case AND core temps lowered by 4c!!!!! I was shocked!

Entirely possible!
Just look at how much metal you removed by cutting out that fan grill. The problem is those case fans just don't have the power to force air through any restriction. If the fan motor had power it would not have made as much difference.

Cheers,
Mike

[bterry13]

Yeah, most cases have fan grills in the back that seem to be 80% metal, 20% holes. They are extremely restricting. I wonder how much air gets through one of those, compared to a fan filter.

[Insyder]

A slight amount of negative pressure. Same 2 intake as rear fans, but rear has a slot and PSU fan.

[captain_amd]

negative

intake, rear exhaust, and top exhaust

[MorganB]

I have both :)

I have a VapoChill and I keep positive pressure in the Main Case area but i keep negative pressure in the compressor compartment. I keep it negative there because almost no cooling is done IN the compartment, its done in the radiator grill at the front of the compartment. I keep negative pressure in the compartment simply to aid the front fan which is dragging (not pushing) air through the radiator.

The hardest thing is to keep the air from the main case escaping into the compressor case :)

[Rickster]

A neutral pressure me have.
1 120mm blowhole exhuast
1 120mm side blowhole intake
2 80mm front intake
2 80mm back exhaust
BTW they are all the same fans. I mean 80mm fans are same brands and the 120mm fans same too

[cptkook]

equal

4 intake
4 exhaust including psu

[Scratchy]

i have slightly positive, by about 10-15cf/f

[powergyoza]

I go for negative pressure.

2 exhaust & 1 intake (for hard drive) - all Panaflo L's 80mm @ 6V

[Speed_Freak]

3 exhaust, 2 intake

[Realgun]

Originally posted by Malpine Walis
Verly slightly negative pressure. Two big fans in and the same fans out. Plus the PSU out.
Ditto and this should be the same fore everone with an Antc chief tec case AND 4 equal fans.

[linlibj]

2 intake 80mm fan
1 exhaust 80mm
On psu: 2 intake and 1 exhaust

[The Doors]

Just a little Positive:

140Cfm In & 132Cfm Out.

Adriano

[Insyder]

I'm up to just a little positive now...3x 80cm in and 2x80 + PSU out

[RangerJoe]

negative...alot of it. two intake 80mm's 4 exhaust 80mm's, and a 100+cfm exhaust as a blowhole..and barely any dust

[tio]

Positive...

intake: 1 x 120mm (90 cfm) + 2 x 80mm (45 cfm each)
exhaust: 3 x 80mm (35 cfm each) + PSU fan (probably like 3 or 4 cfm:D )

[Ben Cole]

Lets face it, the same amount of air goes in as goes out in everybodies system. Otherwise we'd all be creating vacuums...LOL

Just being pedantic......anyway seriously I have a bigger exhaust fan than intake fan.

[340Duster]

2 80mm intakes 1 front 1 rear. 2 80mm exhausts on the side panel. I would say it's slightly negative since the intake can only pull air through the small holes in the case stamping. And I plan to add filters since blowing off the HS every 3 weeks isn't fun. But now the case temp is about 2 deg above the room temp.

[v8vega350]

i still wonder why people dont just pull the side of there case off and blow a desk fan into there case :) otherwise you gotta love water cooling with the rad. outside and 2 case fans@5 volts and the noise killer on these sparkle psu's silince is great

[fmah]

Yeah, I did that, but it uses up too much space. I had a 12" industrial Patton floor fan blowing into it. I had it with a duct too, that was nice, very low hum noise. I even disconnected the power supply fan, really quiet.

Now I'm trying to be more practical, replaced it with 4 120mm fans on the side. Lower airflow, but I'll fool around with it and maybe start turning off fans inside the computer for quiet.

So positive.

[JusDenny]

This one's fer safemode.

The barometer here in this room is showing 29.96 inches and steady. However, if I put it's sensor probe into my case it reads 28.56

Since fans can't do that does that mean that my computer sucks?

Seriously though; Case pressure, positive or negative, doesn't matter. What's important is the volume of air moving through the case, and the flow patern it takes as it's moving. I can seal the thing up so it'll hold 5 pounds of pressure, negative or positive, and it won't cool any better either way.

[Barnstormer]

3 out and 1 in, all 80's

[stan03]

positive= 4 intake 3 exhaust

[RadiationMan]

1 fan going in
1 fan going out
PSU going out
_____________
negative pressure

[XeRoFuN]

Mine is negative due to the PSU fan...if that didn't count it would be neutral. I am thinking of adding another intake fan however.

[modenaf1]

I dont know what to vote so maybe you can help me. both sides open and a box fan on high on the left side.

id assume positive pressure because the mobo blocks some of it right? oh and to increase the airflow i have part of the back taken off too. i was thinking of taking out my cd drive covers and puting an 80mm fan in there exhaust to help equilize the pressure.

[Weltall]

2 intake 80mm 3 exhaust 80mm plus my PSU fans 1 in and 1 out.

[L_P]

Running a positive setup.
Had a Neg setup but I was upset of all the dang dust that was getting stuck in the cdrom and cracks in the case, so switched to positive and now the case temps droped 2C and its much cleaner.
-L_P

[pablopelotas]

negative 2in 3 out

[Kilomph]

Whats better? I have a 120mm 190 CFM fan in front, and dual 80mm 60CFM fans in the back... all Delta of course...

[lazerin]

Originally posted by Kilomph
Whats better? I have a 120mm 190 CFM fan in front, and dual 80mm 60CFM fans in the back... all Delta of course...

Hard to say. The only person who can answer that question is you. At the moment, you are running positive pressure. If you're happy with the temps, stick with the setup, if not, switch it round so that you are running negative pressure and see whether there's an improvement.

[TLhead]

Running a very positive pressure with a 120mm and a 90mm in and the PSU fans and a ducted 90mm exhaust out.

Tried running with negative pressure for a while, but found that I was sucking heat from the PSU into the case.....I turned around my 120mm and dropped 10 C!

[mjmnam]

positive. 3 in 3 out
roughly totals 135 in 110 out

[Zomu]

negative. need to add another intake to even it out.

[Tekime]

100CFM in, 100CFM out.

[dynamodaimyo]

negative. 2 exhaust fans and 1 intake.

[DoomArse]

negative

[Chuck232]

Negative.

70CFM out, 60CFM in.

[newindy4130]

:cool: safemode, i really like what you said about air flow it songs good. i'm new to the pc world and leaning alot reading all the forums. like to say if you can help me to oc my 2700+.thanks.

[Dr. Possum]

0 CFM in, 0 CFM out.

:-x

This setup isn't worth overclocking, so I'd rather just have quiet until I get my water and some nice hardware. Temps are high, but acceptable. Low 40's CPU, high 30's mobo.





~DP

[arabarabian]

It is only very slightly positive, around 10 cfm difference.

Thank You,
Daniel

[threeputt]

two 80 mm in, two 80 mm out...

[Restorer]

My pressure varies with my whims (and my fan controller :) ) but under most circumstance I'm positive. Right now I have my comp in a tight space, so I can't use the side fan. That means right now I'm REALLY negative: a difference of 50 CFM at least; 132 CFM at most. :eek:

[BPM]

Right now its slightly negative.

I have 1 fan going in on the side, and 1 fan going out on the back, and the PSU fan going out.

I just ordered an 80mm 35 CFM fan for the front of the case to equalize the pressure and maybe put me slightly on the positive side since the PSU fan typically has less airflow than the rest.

[Alucard]

positive

[sautegod]

right now I have the side of my case off, so things are pretty neutral

[BPM]

I have to say though... unless you have a truly airtight case, all this pressure stuff is BS :eek: :D

With a non-airtight case, pressure will always be neutral, regardless of the number of fans.

[omaticrail]

Dust bunnies?

I'm curious about those comments concerning dust and negative arrangements. This suggests that a positive arrangements are not susceptable to dust problems, and--believe me--that just ain't so. The only explaination that I can think of is that, in the positive arrangement, you have confined the in-flow to a manageable, pre-selected spot/area that you could slap a filter on. Is that what you guys are referring to?

[BPM]

Originally posted by omaticrail
Dust bunnies?

I'm curious about those comments concerning dust and negative arrangements. This suggests that a positive arrangements are not susceptable to dust problems, and--believe me--that just ain't so. The only explaination that I can think of is that, in the positive arrangement, you have confined the in-flow to a manageable, pre-selected spot/area that you could slap a filter on. Is that what you guys are referring to?

That's what I would guess. See my comment above yours. Dust will ALWAYS get into the PC unless you have both an airtight case, AND a filter on the fan. What the fan doesn't suck in, the imperfections in the case will.

I guess if you had several in-blowing fans though, the dust would be more confined to come in through the fan than the crevices in the case.

[Evil_Eye]

I voted negative.

[PachManP]

posative, but that might change if I ever get around to putting the filters on

[RedArmy]

Negative. IMO regardless of positive/negative airflow, the amount of dust in the case will only depend on the total air being pushed through. Maybe the better the cables are arranged the less surface area for dust to collectr on will be exposed.

[gungeek]

The case pressure is slightly negative. I have the hard drive mounted in a 5 1/4 bay with the bay cover removed for airflow. I can barely feel air flowing into the case to the HD. Airflow to the HD used to be brisk before adding a side duct to the cpu heatsink.

[AFIsoldier]

3 80mm in 2 80mm out with 80mm psu fan out
on paper neutral(what i posted) but more or less negative, 2 intake fans are only 15cfm and the 2 exhaust are 35cfm

soon to be changed to a more, much more positive flow

[spiker]

positive

[Recnelis]

Positive

2 x 80 mm in (lower front and HD
1 x 92mm in (Side vid card)

2 x 80mm out (rear top)
1 x PSU fan out

[Venesectrix]

I think it's neutral, though it could be slightly positive/negative. I've got a smart case fan II intake side window, smart case fan II exhaust rear, PSU exhaust rear, and some stock fan that came with my case intake.

[Korndog]

probably 60cfm going in
about 120cfm going out on a cold day
increase linearly (with some constants) as it gets hotter (gotta love the pyramid II)
maxes out at ..
130cfm in
180cfm out
@ 32c ambient temps

guess thats negitive

//EDIT
just changed..
85cfm blower (high pressure) though radiator
2 panaflos @ 24cfm on the power supply
total of 133cfm, now positive pressure :)
at about ~25dba
less then half the airflow, probably quad. the pressure and even lower temps! damn i love blowers.. don't take that out of content;)

[nodark]

negative

[VictorPhung]

my case has 2 out and 1 in fans

[TheGreySpectre]

neutral... big ps fan blowing out, 120mm blowing in, no case side

but I don't care GWAHAHAHAHA I like my watercooling, silence is so nice:D :D :D :D

[Baz]

Slighty positive

[caddyg1]

2 80's in the front, 1 80 on the side, dual 80 Tornados on the out flow of the radiator and then there is the pws....so neutral @ idle till I turn those dual 80's up then it's much negative

[Blue_Dragon1521]

me positive airflow

[Bugalaman]

who the hell would ever want positive????? HEAT IS YOUR ENEMY! you want it to get out! not stay in! i have neutral, but negitive would seem the best.

[Chucky Da Pwner]

I've got neutral.

[AFIsoldier]

with my new case i have negative...
2 front intake
1 side intake
2 rear exhaust
1 top exhaust
2 psu exhaust

kinda wanted neutral to positive to keep dust low but temps are fine and dust isn't an issue so far

[Chaser]

i would say taht i am neutral, i have 4 in and 3 out, but the filters on the intake fans even it out

[veyx]

Im neutral, maybe a wee bit negative, but nothing to worry about for me.

[Seven]

My airflow is most definately negative, and it's going to get worse.

I have only two 80mm fans blowing in (Lian Li pc-70), but I have 2 rear exhaust fans, 2 powersupply exhaust fans (count as one because they do the same thing), abit's OTES fan, and that's it so far.

I'm going to add 3 120mm fans blowing air up out of the case (Thermochill 120.3), so that'll mean even more negative pressure. I dont see why positive is good...negative seems like the best, maybe next to neutral.

[mtb856]

I have more Intake in my case, and my case temp is about 4-6C.
I've tried reversing and moving some of my fans around, although when I had more exhaust fans, the case temp went up about 3C. It might be the placement that I have, 2 intake bottom front, 1 intake on the side panel and on the back, and an exhaust on the back and on the top of my case. Is there some other combination that might work better?

[dead_man311]

i have to say Neutral , im trying to think where all my 17 fans are. lol

[intox]

i got negative pressure for now till i can get a filter for my side panel fan. i tried turning it around and i had so much dust after just a few days (better cooling tho, got my radeon 9800np past xt speeds)

[infinity9]

Damn this thread has been goin on for awhile. I bet the original posters dont even have the same computer equipment now.

[jcsurg]

I definitely have positive 100 cfm normally going in and when I want it I can get 256 cfm or 1 inch water pressure

http://www.ocforums.com/showthread.php?s=&threadid=284584

[Xenon74]

I'll say positive
two side fans blow in and PSU fan blows out. There's also openings at back panel.

[OCDevil]

positive 3 in - 1 out all 80mm

[Voodoo Rufus]

Slight to heavily positive depending on intake fan power, with foam intake filters.

[timzak]

No front intakes, only good venting (grills cut out, case raised a few inches and overhanging its base slightly to remove any airflow restrictions).
1 x 80mm (12v) side intake
1 x 92mm (7v) exhaust
plus PSU exhaust

BTW, is this a trick question? I chose "Negative" but now that I think about it, don't any exposed vents compensate for fan pressure and keep the inner case equalized? Otherwise the case would either be collapsing in on itself (too much negative) or bulging like a Ballpark Frank (too much positive).

[fyshawk]

I have two 80mm intake one is in front of hard drives the other is in side window also have two outake fans 80mm in rear of systemkeeps my system cooled pretty good a little loud but tolerable

[mobyj]

I have 3 in and 3 out but i think i want to change it to 4 in and 2 out because my psu has 2 out!!

[Shadowalker191]

netural baby. Watercooled.

[bored-sarcasm]

yay for teh neutral

[Radical]

More negative for me.

[Daydreamer]

A bit Positive for me (i think)

Two intake fans in the front
One Outtake at the top
Two intake in side panel
Two outtake in tha back

[Shoeby]

Small positive for me

[sipherblade]

slightly positive

[neonblingbling]

REALLY positive right now. I have a 120 pushing about 85 CFM, and just one 80 exhaust fan pushing 40 CFM, plus a lame PSU fan. In a bit though, I should be neutral when my replacement 80 exhaust fan comes in.

[PLOBBY]

im neutral, 1 in 1 out :) i need to gfet more fans though....im runnin my case at around 28 C so i want it to be lower :)

[@md0Cer]

I have a box fan on high blowing through my case with both sides open. My only exhaust is the PSU. I would call that positive :)

EDIT:

im neutral, 1 in 1 out :) i need to gfet more fans though....im runnin my case at around 28 C so i want it to be lower :)

28°C is not bad at all.

[Vflux]

92mm tornado infront/92mm tornado exhaust/92mm tornado-SP94/92mm on the side panel(removed it lately coz of dust) It's a drag to clean my rig once a week.............

[wluk]

I only have 2 PSU exhaust fans with no intake.

[litening]

positive, keeps all the dust out.

[mould_jesus]

basically, i've never tried adding up the exact airflow of front/back/etc.

but here's my setup. 2 x 80mm intake blowing right on the hard drive, plus 1 x 120mm intake, 1 x 80mm + 1 x 120mm exhaust, psu modded with 2 x 80mm and 1 x 120mm, all pushing exhaust. plus an 80mm intake on the side panel.

so i'm thinking probably it's a little bit negative, but it's plenty of air either way. keeps me nice and cool.

[ghettocomp]

unfortunately the airflow in my case is nearly ZERO.
keeps things a toasty 60-65c. CPU only at 38C :p

[TheGreySpectre]

^^ that doesnt make sense, how is the inside of your case 60 yet your cpu 38 unless your are using cooling like water, but even with water you still cant get below ambient

[veryhumid]

I go with negative, and i am still getting great temps. plus this will let me end up with less dust, correct?

[ghettocomp]

^^ that doesnt make sense, how is the inside of your case 60 yet your cpu 38 unless your are using cooling like water, but even with water you still cant get below ambient

It never does make sense, wood desk, water cooling. The Rad is outside the case(desk) only one case fan moving air out of the box, been that way for years :shrug: Don't know why it keeps going. Never had real problems.

[Sniph]

My setup:
3 80mm Intake Fans in front. 1 80mm intake in sidep. 2 80mm exhaust in back. 1 pci exaust in back. PSU exhaust. I think im about equal.

Edit: All the fans are extremely bad fans. I think I got most of them on ebay for like 1 buck a piece. That was way back when i wanted pretty LEDS, not air flow.

[Gabbiani]

It is really kind of hard for me to say, but I voted neg. I have 3 out 2 in on the cpu side. The water side pulls in through the front rad and out through the back one. The back is adjusted slightly faster for some reason in my mind I thought it would be better that way.

[lowfat]

I run neutral... 3 exhaust fans, no intake. i removed the intake fan on the front of the case, and just let the fans pull the air in.

[Enablingwolf]

I run one fan in and two out. With the vents in back of the case it gets or gives as much air as it needs.

I voted neutral.

[Blackmage]

im negitive All my Fans ALL blowing air out/ but i do have two infront of my HD which blow to my back case fans which blow out!