The Panaflos I use are marked:
NMB-MAT
5L20A73 -1A
Model FBA08A12M
12V 0.17A
3-pin only, but they do a great job and definitely keep things cooler than Noctua NF-A8-PWM
I have lots of extras since the only way I was able to find that model when I was originally looking was to get a case of them. I have them listed at $7 each including a Y adapter in my second FS/FT post, but if you need a lot, and don't need the Y cables, I can do a bit better!
In my SC847 chassis' I have moved to FAN-0125L4 in a modded FAN-0126L4 / FAN-0099L4 carrier, which retain hotswap capability, and are 4-pin PWM
Part Number - (A) (RPM) (CFM) Pressure (dBA)
FAN-0125L4 - 0.35 6,700 59.6 0.68 47.0
FAN-0126L4 - 0.60 7,000 72.5 1.09 53.5 (new SC847 stock fans)
FAN-0099L4 - 0.80 6,300 90.3 0.85 51.0 (old SC847 stock fans, which sound louder than the new ones to me despite specs)
Those ratings are at full tilt of course, I find that in a JBOD the 0.35A in a SC847 JBOD PWM down to a lot quieter than the stock ones - the fan drone is a lower pitch and intensity, although still quite noticeable in the same room. In contrast, the stock fans are noticeable 2 rooms away around corners, and a higher pitch as well.
PWM controlled by the motherboard though, even the stock fans can be quiet depending on which motherboard and fan profile you use, especially with X10/X11 fine grained IPMI fan speed control.
That said, I don't have as much time as I would like to mess with this stuff, so after finding how quiet I could safely get my chassis' I decided to take a better safe than sorry approach. Most of my stuff is X8 and X9, so I don't have the fine grained IPMI fan speed control, so in chassis' with motherboards, I use the workstation / quiet fan profile, and use Panaflo, 0.35A or 0.60A fans depending on the chassis. For JBODs, I am going to all 0.35A FAN-0125L4 fans in modded carriers because I know that in my situation they can move enough air even on the hottest days, are quiet enough, and don't draw a ton of power.
Backplane firmware:
A few months ago, I updated the firmware on most of my chassis' SAS2 expander backplanes which were running old versions. You have to flash the firmware into 2 regions, and the "MFG" file for the model specific features such as drive id lights and fan control. The MFG file MUST match / be compatible with the firmware version or drive identification lights do not work. Anyway, there are 2 variants of the MFG file for each backplane - does anyone know what the difference is between the regular and "nofan" versions is? Are you supposed to use nofan with a motherboard when it is controlling the fans, or in a JBOD, or is it related to fan speed control or buzzers / alarms or something else? If we could somehow get better PWM control of fans in a JBOD, even if it requires sending SAS enclosure commands through the HBA, I'm sure lots of folks would be happy