Originally Posted by Phenomanator53
If their fans aren't great, how do they manage to guarantee a 6 year warranty? shouldn't it fail long before then? anyways i cant hear the fan right now and it at 870RPM
MTBF @ 40*C on a sleeve bearing fan is ~50k hrs. Depending on who you ask.
52 Hours (what AC's fans are rated for) translated into normal people time = ~5.9 years.
That's a mean-time between failures number though. Which doesn't really mean jack.
Noctua's SSO bearing was a sleeve bearing, and they gave it a similar warranty.
Most sleeve bearings do not fail that quickly. Unless they're in very hot conditions for constant use.