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Is a 120mm @ 64 cfm a good rear fan for exhaust?

post #1 of 4
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Ok !!! I finished up my final cooling setup all i need to figure is my rear exhaust fan...

Current setup: Coolermaster HAF 932

Corsair H70 on top push-pull-intake
2 x 120 mm next to H70-intake- 1700 rpm, 64 CFM--24 dba
upper front by drive bays, 140 mm-intake- 1200 RPM, 60 CFM,- 16 dba
bottom front- 230 mm-intake- 700 RPM, 110 CFM- 19 dba
bottom- 120mm-intake- 1700 rpm, 64 CFM- 24 dba
upside down psu on bottom 140mm-intake

Should i put a 120mm or 140 mm on the rear to exhaust? Any suggestions?

All the negative air is coming out the rear while positive air are coming from top,front, and bottom.
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post #2 of 4
140mm just because you can, don't see any reason why not unless space is an issue or something. The only downside is it might make more noise but then again larger fans tend to have more efficient blades and also run at slightly slower rpms. All in all it will probably make little difference but as I said at the start, I would go with bigger just because you can and it will probably have more ability to exhaust the heat than a slightly smaller 120mm fan.

Most fans tell you on the packaging what volume of air they can shift in a given unit of time so you could have a look at those figures.
 
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post #3 of 4
Quote:
Originally Posted by GerroffMe View Post
140mm just because you can, don't see any reason why not unless space is an issue or something. The only downside is it might make more noise but then again larger fans tend to have more efficient blades and also run at slightly slower rpms. All in all it will probably make little difference but as I said at the start, I would go with bigger just because you can and it will probably have more ability to exhaust the heat than a slightly smaller 120mm fan.

Most fans tell you on the packaging what volume of air they can shift in a given unit of time so you could have a look at those figures.
Bigger doesn't mean better. I find that there aren't too many good 140mm fans out there. I personally prefer the 120mm Gentle Typhoons over 3/4s fo the 140mm fans out there. Fan specs like to lie too.
post #4 of 4
I use Enermax Magma 1500rpm as my exhaust, only, fans. They are very quiet.
69.15cfm adn 18dBA rating.

Advantage
They are cheaper and easier to find than Gentle Typhoons.
You can remove the blade for ease of cleaning.

Disadvantage
Low static pressure, so reusing them for supply air applications like radiators is not recommended.
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