2x 140mm chassis fans setup

[BusteR]

I bought a CM N500 case pre-installed with 2x120mm sickle fans. I bought additional 2x140mm CM chassis fans.

Should I install
a) 2x 140mm fans on top
b) 1 on top and 1 in front to balance air in/ air out ? (for this option, the top fan should be installed towards the Rear or Front if the chassis is standing??)

Thanks!

 

[thegamer1907]

u may want to list your other components.
suggest you to go for positive pressure, because positive pressure will have less dust in the case than negative pressure.

install both 140mm fans in the front (if possible, since the picture says front only can fit one 140mm?), then install the removed 120mm fan on the bottom as intake.

or if cannot mount 2x 140mm front..
1x 140mm intake
1x 140mm top exhaust
1x bottom 120mm intake
1x rear exhaust
this setup may lean toward negative pressure due to obstruction in the front intake which may lower the airflow from the front.

 

[BusteR]

over at vr zone,
1 guy suggest use both as intake with 140mm filter.
1 guy suggest use them as exhaust as 140mm is slower ~1000 RPM only

Your suggestion is the most 'complicated'

or if cannot mount 2x 140mm front..
1x 140mm intake
1x 140mm top exhaust
1x bottom 120mm intake
1x rear exhaust
this setup may lean toward negative pressure due to obstruction in the front intake which may lower the airflow from the front.

the shop owner at SLS shop suggested i buy 2x 140mm and use them on TOP according to his experience. further told me that fans on side and bottom are not 'essentially' needed.

 

[thegamer1907]

my suggestions are all suggesting you to go positive pressure. what the first guy suggested (2x 140mm front) was my first suggestion.
What the shop owner suggested to you will contribute to a negative air pressure, which will in turn causes dsut to appear at any possible opening in the casing.

yes, my second suggestion may be complicated and "imbalanced" but that is the only alternative config i can think for positive pressure with your fans.
still, the best is 2x 140mm front, and the removed 120mm fan can be installed at bottom intake (increases the positive pressure) or top exhaust (decreases the effect).
you can try to fit the 140mm fan in the 5.25mm bays and hold it in place with some blue tack or cable ties if the mountings would not allow for 2x 140mm

140mm fans may be slower than 120mm fans, but they have higher CFM at a slwoer RPM due to the larger blade size. all my suggestions are assuming that the CFM of your 140mm fans > 120mm fans (which is likely the case)

 

[BusteR]

hmm interesting, thanks for the detailed explanation.

my suggestions are all suggesting you to go positive pressure. what the first guy suggested (2x 140mm front) was my first suggestion.
What the shop owner suggested to you will contribute to a negative air pressure, which will in turn causes dsut to appear at any possible opening in the casing.

yes, my second suggestion may be complicated and "imbalanced" but that is the only alternative config i can think for positive pressure with your fans.
still, the best is 2x 140mm front, and the removed 120mm fan can be installed at bottom intake (increases the positive pressure) or top exhaust (decreases the effect).
you can try to fit the 140mm fan in the 5.25mm bays and hold it in place with some blue tack or cable ties if the mountings would not allow for 2x 140mm

140mm fans may be slower than 120mm fans, but they have higher CFM at a slwoer RPM due to the larger blade size. all my suggestions are assuming that the CFM of your 140mm fans > 120mm fans (which is likely the case)