I went down that path a couple of days ago when I installed the HDD & noticed the fan.singlefished wrote: ↑Wed Jan 17, 2018 19:34... If you can get the make and model then pump it into Google there's a good chance you'll stumble upon manufacturer specs that will give you expected life span
The fan we have in our U4 is marked:
“FXDS. DC brushless fan model: DC 12V. +red –black. SZFUXIDESHUO Co. Ltd. Made in China.”
I measured this as 50 x 50 x 12 with 7 blades & mounting holes at 40 centres & 56.5 diagonals.
See image at the bottom.
The FXDS website shows two types of 50 x 50 DC fans.
One here which isn’t the one we have (no enclosed sides).
And the other one is here which looks like ours but the height is different (unless I measured the height wrong – I’ll check that later).
(edit) Measured again & confirmed height as 12mm. (/edit)
For each of those models there are four 12V models that cover four different speeds & air flow, & each one has a voltage range of 7 – 14V.
I don’t know which one of those we have. And so far I haven’t been able to find an expected life span.
(edit 2:) See here onwards for more info about the fan in the U4. (/edit 2)
In my experience with fans, they can last a fair while but due to the type of bearings some use, they get noisier with time. One I had to regularly re-lube before eventually scrapping it.