How much CFM pressure should I have in my case?

FantasmicalMan · Jul 2, 2013

So I have been reviewing parts for a upcoming build and making sure they are all compatible, but I checked the fans and how much positive pressure there was. and it turned that there was 98 CFM more going in then coming out.

Is this normal or would this be a terrible fan config. and what are some lower CFM fans what have white LED's, and arn't going to sound like a jet engine.

The Fans are:

http://www.newegg.com/Product/Product.aspx?Item=N82E16835200051

And
http://www.newegg.com/Product/Product.aspx?Item=N82E16835181027

(those are for the H100i)

Snipergod87 · Jul 2, 2013

Have you calculated the airflow leaving the case via the graphics card (if you are getting one). Even so I wouldn't worry about it to much, however from what I understand having positive airflow can lead to more dust inside the case.

FantasmicalMan · Jul 2, 2013

Snipergod87 :

No I haven't, but the card would be a Gigabyte Windforce GTX 770, and I also don't know how I would do that.

everlost · Jul 2, 2013

CFM and pressure are related but not the same. if you have more air entering your case than leaving, the extra air will find a way out. probably through your exaust fans. or it just wont enter.

DarkSable · Jul 2, 2013

Snipergod87 :

Wait, what? No.

If you do it right, the reason you want positive airflow is because it means that air is exiting both out the output fans and OUT through the cracks in the case. If you can put a filter on all intake fans and still maintain positive air pressure, that means that every place where dust is going to try to get into the case is filtered. Negative pressure pulls air in through those cracks, meaning they, and the case, get clogged with dust.

Snipergod87 · Jul 2, 2013

DarkSable :

Snipergod87 :

Wait, what? No.

If you do it right, the reason you want positive airflow is because it means that air is exiting both out the output fans and OUT through the cracks in the case. If you can put a filter on all intake fans and still maintain positive air pressure, that means that every place where dust is going to try to get into the case is filtered. Negative pressure pulls air in through those cracks, meaning they, and the case, get clogged with dust.

Which is why I said from what I understand (it didnt really make sense to me though)

DarkSable · Jul 2, 2013

Snipergod87 :

Which is why I tried to explain it, yeah. Did I do a decent job of it, or is it still confusing?

FantasmicalMan · Jul 3, 2013

everlost :

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How much CFM pressure should I have in my case?

FantasmicalMan

Honorable

everlost

Snipergod87

Splendid

FantasmicalMan

Honorable

everlost

Honorable

DarkSable

Judicious

Snipergod87

Splendid

DarkSable

Judicious

FantasmicalMan

Honorable

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