Question Which fans should I get?

[Tic.Tac.]

Hello!
I am planning to buy some pc fans with an aim of providing airflow, but I can not decide which brand and size to choose?
My Corsair 270r case supports:
-2x front 140mm or 120mm
-2x top 140mm or 120mm
-1x rear 120mm
The main goal is to prevent dust from staying in the case and improve cooling a bit. Currently, I only have one 120mm rear fan, which is not ideal because of negative pressure inside the case.

Can you recommend me some good fans and what size should I use?
I would put two 140mm at the front (intake), one 140mm at the top (exhaust) and leave the 120mm one at the rear (exhaust).
Is that a good idea? Please let me know.

I was looking at Corsair ML 140mm and 120mm fans. Are these any good?

The motherboard I use is MSI B350 pc mate which uses 3x 4pin fan headers.

I will really appreciate all your answers.
Thank you in advance!

 

[Dark Lord of Tech]

BeQuiet Silent Wings 3

 

[Tic.Tac.]

BeQuiet Silent Wings 3

Thank you! I will check them out.

 

[Dark Lord of Tech]

Very quiet and efficient. 👍

 

[ElectrO_90]

Noctua all the way - but expensive
https://noctua.at/en/products/fan

 

[Tic.Tac.]

@Dark Lord of Tech and @ElectrO_90 thank you for your help. Does anybody have an opinion on Corsairs ML or AF series? They are a bit cheaper than Noctua and BeQuiet fans.

 

[Dark Lord of Tech]

AF quiet editions are very good , I own several of them.

 

[KeyMB]

I did the the Corsair LL120 kit in my 280x rgb case and love it. I have 2 front intake and 2 top exhaust. Seems to be good

 

[Karadjgne]

Depends slightly on your cpu cooler. If you have a stock type down draft or broadcast cooler, pthen 2x fans on top work more effectively. If you have a tower or directed flow cooler, then at least 1 fan right behind it (usually rear exhaust) and the other at top-rear is better.

A 120/140 exhaust paired with a 140/140 intake is fine. It's not always so much about the size of the fan, or even the cfm, but the rpm and curves the fans run on. For instance if you have slow spinning 140mm exhaust that puts out only 25cfm at 500rpm and a 120mm intake that puts out 30cfm at 700rpm (both well under maximum outputs), then you'll see a positive system. If at idle where the exhaust didn't change, but temps drop the intake to 500rpm, and the fan now is only 20cfm, that positive system is now flipped to negative.

So while fan size choices can be important, it's entirely possible that setting up curves and speeds will change the airflow dynamics contrary to what your aims are.