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Help me with fans

post #1 of 6
Thread Starter 
I need some info on fans.

1. Higher/Lower rpm/cfm, which is best for intake and for exahust?

2. For maximum air cooling, negative pressure is the best right?

Thanks.
    
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post #2 of 6
Quote:
Originally Posted by SKULLTRA1L View Post
I need some info on fans.

1. Higher/Lower rpm/cfm, which is best for intake and for exahust?

2. For maximum air cooling, negative pressure is the best right?

Thanks.
1. Intake, get something like the Air penetrator, or Gentle Typhoon if you can afford it. Exhaust, doesn't really matter, just make sure it has a decent CFM.

2. Positive pressure is always ideal, but unless you have air filters on your fans it doesn't matter.
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post #3 of 6
Quote:
Originally Posted by SKULLTRA1L View Post
I need some info on fans.

1. Higher/Lower rpm/cfm, which is best for intake and for exahust?
the higher the CFM, the more air you can move through your system, but obviously the more CFM you move the louder your system gets, on a proportional basis. So a 120mm fan that moves 45 CFM will TYPICALLY be quieter than a 120mm fan that moves 90CFM, because the same size fan has to spin much faster to move that much air, so it will create more noise. However, the larger fan sizes can move more air at a lower RPM, so they make significantly less noise while usually moving a more significant amount of air. The point still remains however, that faster fans tend to move more air and will make more noise. So you choose, either quiet system that moves a decent amount of air, or choose a louder system that moves a large quantity of air. Personally, I like to use large fans because they can move a large quantity of air at a slower speed, making them quieter but very effective (i use 230mm fans on my case).

Quote:

2. For maximum air cooling, negative pressure is the best right?

Thanks.
for maximum air cooling, negative pressure is the best, that is correct. positive pressure is great for keeping out dust and dirt particles, but raises the temperatures inside the case. I've heard people claim the rise in temperature is minimal/inconsequential to people claiming it's a HUGE deal and you should never do it. I think the middle ground wins here, and you generate enough heat to warrant using negative air pressure, but only if you're willing to make a conscious effort to clean your system out
Edited by b3machi7ke - 7/27/11 at 9:00am
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post #4 of 6
Thread Starter 
Quote:
Originally Posted by b3machi7ke View Post
the higher the CFM, the more air you can move through your system, but obviously the more CFM you move the louder your system gets, on a proportional basis. So a 120mm fan that moves 45 CFM will TYPICALLY be quieter than a 120mm fan that moves 90CFM, because the same size fan has to spin much faster to move that much air, so it will create more noise. However, the larger fan sizes can move more air at a lower RPM, so they make significantly less noise while usually moving a more significant amount of air. The point still remains however, that faster fans tend to move more air and will make more noise. So you choose, either quiet system that moves a decent amount of air, or choose a louder system that moves a large quantity of air. Personally, I like to use large fans because they can move a large quantity of air at a slower speed, making them quieter but very effective (i use 230mm fans on my case).



for maximum air cooling, negative pressure is the best, that is correct. positive pressure is great for keeping out dust and dirt particles, but raises the temperatures inside the case. I've heard people claim the rise in temperature is minimal/inconsequential to people claiming it's a HUGE deal and you should never do it. I think the middle ground wins here, and you generate enough heat to warrant using negative air pressure, but only if you're willing to make a conscious effort to clean your system out
Thanks. What should I use for intake and exhaust, a fan with higher rpm and higher cfm or vice versa? Please don't give examples of air penetrators cause this aren't available here.
    
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post #5 of 6
Quote:
Originally Posted by SKULLTRA1L View Post
Thanks. What should I use for intake and exhaust, a fan with higher rpm and higher cfm or vice versa? Please don't give examples of air penetrators cause this aren't available here.
i don't really know what type of case you have, so i can't tell you exactly what i would do in your situation...but for me, personally, I use 230mm fans in my cases, because they can move an exceptional amount of air at a fairly low RPM...however, not many cases iirc can have multiple 230mm fans, you're lucky if you can fit one in there...

honestly, your best bet is to take in what equipment you have, and go through the next couple links, and try to figure out what YOU want for your build...everyone has different visions of what they think a great build is, you have to make it yours...if you want to try to use bigger fans great, if you want smaller fans that are slower/quieter that's fine as well...go through these couple guides and they should give you some excellent insight...

http://www.overclock.net/air-cooling...ls-thread.html

http://www.overclock.net/air-cooling...ered-here.html
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post #6 of 6
Thread Starter 
Quote:
Originally Posted by b3machi7ke View Post
i don't really know what type of case you have, so i can't tell you exactly what i would do in your situation...but for me, personally, I use 230mm fans in my cases, because they can move an exceptional amount of air at a fairly low RPM...however, not many cases iirc can have multiple 230mm fans, you're lucky if you can fit one in there...

honestly, your best bet is to take in what equipment you have, and go through the next couple links, and try to figure out what YOU want for your build...everyone has different visions of what they think a great build is, you have to make it yours...if you want to try to use bigger fans great, if you want smaller fans that are slower/quieter that's fine as well...go through these couple guides and they should give you some excellent insight...

http://www.overclock.net/air-cooling...ls-thread.html

http://www.overclock.net/air-cooling...ered-here.html
Thanks for the help mate.
    
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