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Topic Title: 220mm or 140mm side case fan advice please
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Created On: 06/01/2008 07:08 PM
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 06/01/2008 07:08 PM
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saiello
Junior Member

Posts: 4
Joined: 05/30/2008

Hello all,

I got a heat issue figured out but I only have one 80mm exhaust fan for my box. I have 2 x 80mm fans in the front for intake but the hard drive bay is disrupting the air flow a bit. I want to move the hard drive up and remove the hard drive bays to improve the air flow.

I would like to add a really huge exhaust / intake fan on the side. I'm not sure if I should add an exhaust fan or get more air into the case. I'm new to air flow and case modding to be a bit patient with me if this is a simple question.

I was debating between these 2 fans from new egg:

http://www.newegg.com/Product/...?Item=N82E16835129248

or

http://www.newegg.com/Product/...?Item=N82E16835234003

The cool think about the 220mm fan is that it would cover almost my whole case side. I'm not sure which would be better for actually cooling my system though more intake or exhaust.

Any tips or advice?

Thanks

-------------------------
AMD Phenom 9850 BLACK EDITION 2.5GHz
ASUS M3A32-MVP Deluxe AM2+/AM2 AMD 790FX
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066
Western Digital Raptor WD740ADFD 74GB 10000 RPM SATA
ZALMAN ZM850-HP Continuous 850W ATX12V V2.2
ZALMAN 9500A
 06/01/2008 07:24 PM
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magdary
Case Modder

Posts: 1228
Joined: 09/20/2007

Id would go for the 220mm blowing in and maybe replace the exhaust with the largest that will fit.

Going for the larger 220 will give you more airflow with less noise and even if proves to be more powerful than necessary you can always connect it to a fan controller and slow it down or maybe connect it to a mobo fan header and use software or qfan to slow it down.

What size will fit in your case as an exhaust in the rear?
 06/01/2008 07:40 PM
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saiello
Junior Member

Posts: 4
Joined: 05/30/2008

Well in the back there is physically room for a 120mm fan, but there is only vent room for an 80mm so I would have to cut out more vent space and drill screw holes. Do you think that more intake would be more beneficial then exhaust?

Thanks

-------------------------
AMD Phenom 9850 BLACK EDITION 2.5GHz
ASUS M3A32-MVP Deluxe AM2+/AM2 AMD 790FX
G.SKILL 4GB (2 x 2GB) 240-Pin DDR2 SDRAM DDR2 1066
Western Digital Raptor WD740ADFD 74GB 10000 RPM SATA
ZALMAN ZM850-HP Continuous 850W ATX12V V2.2
ZALMAN 9500A
 06/01/2008 07:49 PM
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magdary
Case Modder

Posts: 1228
Joined: 09/20/2007

Its a bit of a balancing act to be honest but i would be worried using a side vent as an exhaust as it could upset the airflow accross the cpu fan. I feel any air being blown in from your front fans would be sucked out through the side exhaust before going through your cpu fan.

Its a bit unorthodox but you could try using the 220 blowing in and have the front fans exhausting, that way air would be blown directly onto your mobo and cpu cooler from the 220mm and then be sucked out by the rear exhaust and also air would be drawn from the 220mm across your HDD's by the front exhaust cooling them as well.

Your best bet is to get the 220mm, a decent high CFM rear fan and try the different configurations and see what works best.

Aparently if you have too much input and not enough exhaust you can get static pressure casuing warm pockets of air. A fan controller is also a good idea as you can fine tune things to work at their best, i managed to knock about 4 degrees off my case temp by tweaking my controllers.
 06/02/2008 11:49 AM
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Heffy
Case Modder

Posts: 625
Joined: 03/06/2008

As a general rule, remember that hot air rises. Which means that intake fans should be as low as possible and outtake as high as possible.
If you have a flat top case, you could install an extractor fan there, blowing upwards. Besides, if you have a PSU with a 120mm fan beneath it, it plays a role too, in extracting the hot air.
Basically, there should be an equal input/output. Because of the reasons madgary mentioned.
And, if you don't feel like cutting your case to bits and drilling it like swiss cheese, you could invest in a better ventilated case. Like CoolerMaster's RC-690, for example. It doesn't cost an arm and a leg and has very good airflow. It comes with 3 120mm fans and you can stuff in 4 more. The only inconvenient is it still costs money.
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