Yeah I just bought the Duo and I was trying to find noise info before I bought it. Of course NetGear would choose a lowest-bidder fan manufacturer, regardless of noise output, and nobody really discusses noise on review pages for NAS hardware.
It seems like the Duo fan part number may have changed from the "H" ending?
This Duo I purchased has a fan that says on the label:
CROWN AGE 60x25
DC 12v 0.21 A
The Crown company website is really weird.
Their spec sheet for the 6025 series doesn't any model ending with "U"....http://www.crownelectronics.com.tw/Serpro/AGE06025.pdf
But if you browse their main product list and look at the 6020 series, you can see that "U" is a higher speed fan than the "H":http://www.crownelectronics.com.tw/Serpro/AGE06020.pdf
The 6025 list is more fun when you see that the max airflow for the H series is 25.62 CFM, but if you look at their list of all fan sizes, that page lists the max airflow for their 60mm fans as 34.84 CFM:http://www.crownelectronics.com.tw/Page ... o.asp?id=1
So I would have to presume that the unlisted "U" series is the 34.84 CFM fan.
(Why are they making this so hard to figure out?)
The french fan thread mentioned in the earlier pages of this one is interesting to pick over for URLs, though I don't speak french. It has a link to a quiet fan that looks like a close match...
Noctua NF-R8 80mm - 53 m³/h at max speed, or 31.19 CFM ... a bit low vs the Crownhttp://www.noctua.at/main.php?show=prod ... d=9&lng=en
The 120mm NF-P12 of course has way more airflow, but also at much lower amperage.
Noctua NF-P12 120mm - 92.3 m³/h at max speed, or 54.32 CFM
Amps at full speed 0.09 A --- less than half the Crown at 60mm, but you get more leverage to move air with the big slow blades
19.2 dBA at full speedhttp://www.noctua.at/main.php?show=prod ... g=en&set=1
I'm probably going to buy both of these to see how they compare. More money to blow trying to make this quiet, but that's the way it goes.
(Also, you can use Google to do airflow conversions. Put this in the Google search box and it'll give you the answer...)
convert 92.3 cubic meters per hour to cubic feet per minute