where to place second exhaust fan?

warlocke · 04-19-2007, 11:40 PM

ok i have an exhaust fan sitting here that i bought and have not used yet, been thinking of where to mount it and stuff,

heres all pics of my case
http://s93.photobucket.com/albums/l7...234/Misc/case/

these 2 are ones ive added but there not the same fans now,
http://i93.photobucket.com/albums/l7...e/DSCF0959.jpg
http://i93.photobucket.com/albums/l7...e/DSCF0957.jpg

this is the back of my exhaust fan now as of tonight

but im debating on where to mount this fan either way i will have to fab a mount

but should i put it on top of my case about where the piece of paper is in this pic

or put it sucking air out above the cpu here?

this will prolly be a mod for this weekend so id like to figure something out lol thanks

Duckster · 04-19-2007, 11:55 PM

Well I'd say top. Flowing air from the top has the availability to disperse throughout the whole inside of the case. plus it would be cool.

Nutritious · 04-20-2007, 11:40 AM

That fan in the lower-front is pulling air in, right?

Normally, for side fans, you'd want them brining air in. In this case, since it's right above the CPU, which (I'm assuming) is blowing air down on the heatsink, I'm thinking you'd want to bring air in so that fan and the CPU fan wouldn't be working in opposite directions. Either that, or put it in the top, blowing the hot air out of the case.

**TheMatt** · 04-21-2007, 09:32 PM

I agree with what has been said. The best place would be a fan at the top of the case. The fan on the side of the case over the CPU should always be an intake fan, as should any front fans.

Sgt_Grim_Reaper · 04-21-2007, 10:21 PM

I had a fan on the side once, blowing cool air on the CPU but the temp didn't change at all. I switched it to blow out and it didn't do anything either. I noticed the most change when I put one in the back blowing out and one in the front blowing in, and ensured both were pushing the same CFM. That's what I would suggest.

minster9 · 04-23-2007, 01:19 AM

I concur w/TheMatt.

**1 g0t 0wn3d** · 04-23-2007, 05:50 PM

You should try having more cfm coming out as it creats a vacum the same way the xbox 360 is cooled

warlocke · 04-23-2007, 06:07 PM

its in and the case now has a hole on top =) ill take pics tonight when i get home, im at school right now.

**TheMatt** · 04-24-2007, 09:21 PM

Quote:

Originally Posted by 1 g0t 0wn3d

You should try having more cfm coming out as it creats a vacum the same way the xbox 360 is cooled

That is correct. This way, cool air is drawn in by hard disk bays to keep hard disks cool.

minster9 · 04-25-2007, 03:04 AM

Couldn't help but notice in warlockes 1st pic. that intake fan area of case below PS has been chopped out. Do that to all your fan openings in your case. All you need is wire-type guard. Count the holes covering a fan opening in a factory case that are within the fan inlet/outlet shroud. Measure dia. of each w/calipers or drill bit. Multiply dia. of each hole by pi X no. of holes. Measure inside of fan shroud X pi. You'll probably see about 50% difference in area. Perhaps you have already opened up the other case fan openings? And sgt.grim reaper is also correct airflow;from front to rear. Even if some is exhausted by the power supply,by & large the heated air tends to rise. I would place the top exhaust fan towards the rear on the top of the case.

04-19-2007, 11:40 PM	#1 (permalink)
warlocke Registered User Join Date: Apr 2006 Location: lees summit, missouri Posts: 146 OS: xp pro sp2	where to place second exhaust fan? ok i have an exhaust fan sitting here that i bought and have not used yet, been thinking of where to mount it and stuff, heres all pics of my case http://s93.photobucket.com/albums/l7...234/Misc/case/ these 2 are ones ive added but there not the same fans now, http://i93.photobucket.com/albums/l7...e/DSCF0959.jpg http://i93.photobucket.com/albums/l7...e/DSCF0957.jpg this is the back of my exhaust fan now as of tonight but im debating on where to mount this fan either way i will have to fab a mount but should i put it on top of my case about where the piece of paper is in this pic or put it sucking air out above the cpu here? this will prolly be a mod for this weekend so id like to figure something out lol thanks

04-19-2007, 11:55 PM	#2 (permalink)
Duckster Registered User Join Date: Mar 2007 Location: Manitoba, Canada Posts: 257 OS: Windows Vista 32-bit My System	Re: where to place second exhaust fan? Well I'd say top. Flowing air from the top has the availability to disperse throughout the whole inside of the case. plus it would be cool. __________________ Our scientific power has outrun our spiritual power. We have guided missiles and misguided men. - Martin Luther King Jr.

04-20-2007, 11:40 AM	#3 (permalink)
Nutritious Registered User Join Date: Apr 2006 Posts: 41 OS: Win XP Professional My System	Re: where to place second exhaust fan? That fan in the lower-front is pulling air in, right? Normally, for side fans, you'd want them brining air in. In this case, since it's right above the CPU, which (I'm assuming) is blowing air down on the heatsink, I'm thinking you'd want to bring air in so that fan and the CPU fan wouldn't be working in opposite directions. Either that, or put it in the top, blowing the hot air out of the case.

04-21-2007, 09:32 PM	#4 (permalink)
TheMatt TSF Enthusiast Join Date: May 2006 Location: Boston Posts: 13,701 OS: Win 3.1, 98, NT 4.0, XP Debian 4.0, Kubuntu 6.06 My System Blog Entries: 3	Re: where to place second exhaust fan? I agree with what has been said. The best place would be a fan at the top of the case. The fan on the side of the case over the CPU should always be an intake fan, as should any front fans. __________________ - Matt M - KB1OSC - Folding@Home 85015 [url="http://www.techsupportforum.com/hardware-support/"] If TSF has helped you, please consider donating. If I have stopped responding to a thread, feel free to send me a PM with a link to the thread. It is advisable to subscribe to threads so you will receive updates when replies are posted. You can subscribe to threads from the "Thread Tools" Menu. »Memtest86 »Prime95 »UBCD »SpeedFan »NHC Personal »Everest »Sandra »PC Wizard »RivaTuner »ATi Tool Click here for Useful Articles and Guides

04-21-2007, 10:21 PM	#5 (permalink)
Sgt_Grim_Reaper Registered User Join Date: Nov 2004 Location: New Mexico Posts: 396 OS: XP Pro SP3 My System	Re: where to place second exhaust fan? I had a fan on the side once, blowing cool air on the CPU but the temp didn't change at all. I switched it to blow out and it didn't do anything either. I noticed the most change when I put one in the back blowing out and one in the front blowing in, and ensured both were pushing the same CFM. That's what I would suggest. __________________ Allow Color BBCode No, Allow Size BBCode No, Allow [IMG] Code No, Can Upload Images for Signature No, Can Upload Animated GIF for Signature No, Allow Smilies No, Can Have Fun No

04-23-2007, 01:19 AM	#6 (permalink)
minster9 Registered User Join Date: Jun 2006 Posts: 176 OS: windows 2000	Re: where to place second exhaust fan? I concur w/TheMatt.

04-23-2007, 05:50 PM	#7 (permalink)
1 g0t 0wn3d TSF Enthusiast Join Date: Jan 2007 Location: Sedona, az Posts: 6,528 OS: Vista basic 32bit My System	Re: where to place second exhaust fan? You should try having more cfm coming out as it creats a vacum the same way the xbox 360 is cooled __________________ Bench Test \| PC Wizard \| System specs \| PSU info \| PSU calculator \| Memtest86+ \| Speedfan

04-23-2007, 06:07 PM	#8 (permalink)
warlocke Registered User Join Date: Apr 2006 Location: lees summit, missouri Posts: 146 OS: xp pro sp2	Re: where to place second exhaust fan? its in and the case now has a hole on top =) ill take pics tonight when i get home, im at school right now.

04-25-2007, 03:04 AM	#10 (permalink)
minster9 Registered User Join Date: Jun 2006 Posts: 176 OS: windows 2000	Re: where to place second exhaust fan? Couldn't help but notice in warlockes 1st pic. that intake fan area of case below PS has been chopped out. Do that to all your fan openings in your case. All you need is wire-type guard. Count the holes covering a fan opening in a factory case that are within the fan inlet/outlet shroud. Measure dia. of each w/calipers or drill bit. Multiply dia. of each hole by pi X no. of holes. Measure inside of fan shroud X pi. You'll probably see about 50% difference in area. Perhaps you have already opened up the other case fan openings? And sgt.grim reaper is also correct airflow;from front to rear. Even if some is exhausted by the power supply,by & large the heated air tends to rise. I would place the top exhaust fan towards the rear on the top of the case. Last edited by minster9; 04-25-2007 at 03:16 AM. Reason: sgt.grim reaper is correct also