Corsair stock filters aren't that good though. Since my Skylake build is in Corsair 760T case, i went on and bought Demciflex dust filter kit for my Skylake build,
link:
http://www.demcifilter.com/p0513/Corsair-760T-Dust-Filter-Kit.aspx
I love the Demciflex'es high precision medical grade mesh filters that keep even the finest dust reaching inside of my case.
As far as the max noise of 37 dB(A) goes, you can get that only when you run ML120 at full speed of 2400 RPM. At it's lowest RPM of 400, the ML120 produces only 16 dB(A).
I have 2x ML120 on my heatsink and 1x ML120 as bottom intake. Since i set my fans into SMART mode (from BIOS), i can't even hear the bottom intake fan. RPM on ML120's is about 700 RPM.
Got my 2x ML140 front intakes connected to the case fan controller (running at about 1000 RPM) and since i got 760T filter + Demciflex filter on it, i can only hear air passing through filters. If i were to remove my front intake filters, the audible sound level drops dramatically.
Here's nice video review about AF120 vs SP120 vs ML120,
youtube: https://www.youtube.com/watch?v=JYmCh6AD-zQ