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Calculator for managing case pressure with different sized fans?

AWeakling
By AWeakling
in Cooling
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Hey I am going to be building in an nzxt H710 mid case. I am going for 2 140mm noctua fans on the front, but 120mm fans for the top and rear. I dont want weird case pressure, should I have 3 120mms to offset the two 140s?

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11 minutes ago, AWeakling said:

I dont want weird case pressure

define "weird"

 

just having good airflow with little or no turbulence is far more important than case pressure, if you don't have fans blowing in competing directions chances are you'll have no problems.

I WILL find your ITX build thread, and I WILL recommend the SIlverstone Sugo SG13B

 

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i7 8086k - EVGA Z370 Classified K - G.Skill Trident Z RGB - WD SN750 - Jedi Order Titan Xp - Hyper 212 Black (with RGB Riing flair) - EVGA G3 650W - dual booting Windows 10 and Linux - Black and green theme, Razer brainwashed me.

Draws 400 watts under max load, for reference.

 

How many watts do I need? ATX 3.0 & PCIe 5.0 spec, PSU misconceptions, protections explained, group reg is bad

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25 minutes ago, AWeakling said:

Hey I am going to be building in an nzxt H710 mid case. I am going for 2 140mm noctua fans on the front, but 120mm fans for the top and rear. I dont want weird case pressure, should I have 3 120mms to offset the two 140s?

You could do a simple calculation: For every fan, add its airflow (volume/time) if it's blowing inward and subtract it if it's sucking air out of the case. If you end up with a positive number you should have positive pressure. Probably not overly precise (no accounting for turbulence and whatnot) but good for a rough estimation, I suppose.

Remember to either quote or @mention others, so they are notified of your reply

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1 hour ago, Eigenvektor said:

You could do a simple calculation: For every fan, add its airflow (volume/time) if it's blowing inward and subtract it if it's sucking air out of the case. If you end up with a positive number you should have positive pressure. Probably not overly precise (no accounting for turbulence and whatnot) but good for a rough estimation, I suppose.

Simple dust filters and meshes can reduce airflow by as much as half. Since the type of mesh, filter, and fans heavily vary, it's hard to tell what the actual airflow is going to be without testing. 

 

@AWeakling Cases aren't vacuum sealed so pressure isn't a big issue unless you're trying to optimize for less dust accumulation with positive pressure and filtered intakes. If you're trying to maintain positive pressure for that, just run your intakes at higher rpm than your exhausts. 

If you ever need help with a build, read the following before posting: http://linustechtips.com/main/topic/3061-build-plan-thread-recommendations-please-read-before-posting/
Also, make sure to quote a post or tag a member when replying or else they won't get a notification that you replied to them.

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Thanks for the information! Dust is definitely a concern, so the tip on positive pressure will help.

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