New fan 6 replies

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Dalt

Also known as general_mario

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7th November 2007

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#1 11 years ago

I'm adding a new fan to my pc but i can't decide how to set it up. Should it vent the hot air out or cold air in?

Here is the layout of my pc. Gray boxes are the fans that i have at the moment. yellow one is where the new one is going.

pc_layout.jpg

(that line should be pointing at power, not at the red arrow)




Stark98

I would die without GF

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25th March 2005

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#2 11 years ago

well, the cold air must go in and the cold air must come out. I think you already knew that but still im wondering do you really need one? you have a lot fans i see!




>Omen<

Modern Warfare

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1st January 2005

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#3 11 years ago

Generally you pull cool air in low and exhaust hot air high. The reason for it is cool air decends because it's denser and warm air rises because it's thinner. However, it also helps to have even intake and exhaust pressure, in other words equal CFM coming in and going out. This helps promote consistent and strong directional airflow which replaces the cases ambient warm air buildup frequently with cool air. A common example of things that can disrupt this flow is high RPM side mounted fans that create turbulance to front/back flow. You CAN cool well with side mounted fans, but what you end up with is a louder case that collects dust and needs more exhaust fans due to poor directional airflow. It would be ideal if you could match the combined CFM of the rear fan and PS fan with one large or two small fans in the front. Then if you feel you need a top mounted fan as well, try and make it a 120mm low RPM one so it doesn't disrupt the flow. If you look at well designed cases they have separate comparments front to back for good airflow and separation of warmer components. It's also important to manage cables carefully keeping them out of the airflow as much as possible.




Stark98

I would die without GF

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#4 11 years ago

good post omen and i agree about placing one large fan in the eaft and two small ones in front, but is his casing that good? the casing on its own is important as well.




>Omen<

Modern Warfare

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#5 11 years ago
Sovereign001;4029313...i agree about placing one large fan in the eaft (sp???)

Uh, I never said that, not that I know what "eaft" means. I take it you meant aft (eg rear). I said it would work best to match the total CFM of those in the rear (case fan+PS fan) with two or one large one in front, whichever fits and comes closest to the CFM. Then one large one at the TOP, being low RPM to subtly remove any excess ambient warm air without disturbing the airflow of the others. And yes, to a large degree it matters how well the case is designed. Things like gaps where they are not needed can reduce the efficiency of the air pressure/flow and create dust buildup and most case intakes don't have good filtering. Some crafty custom work can solve that via plugging the cracks and using innovative filtering methods where you want intake air to flow. I have a kingwin KT-424 that is no longer made but is similar (I feel better) than a Lian Li. It's Alu construction, has two 80mm stacked fans front and one rear. The rear fan combined with my PS 80mm fan match the intake flow quite well. The two front fans have their own speed controller and a large screen and filter in front of them. I removed the coarse open cell foam from the filter unit and instead wrapped some black mosquito netting around it's basket which gives me better airflow and filtering.




arcadeplayer987

Revenge was here.

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#6 11 years ago

I think you should place it so it can bring cold air to the memory




Dalt

Also known as general_mario

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7th November 2007

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#7 11 years ago

thanks for help. i'll consider your suggestions when i put in a new fan.