Fan Life expectancy on different bearings question

Pretty much running high speeds = more voltage. You know how more voltage shortens the life right?

Sleeved bearings are the cheapest to make, with an expectancy of 30,000hours. As it ages, the it gets noisier and noisier.

Ball bearings are pretty common. They are good quality and should be expected to last for 50,000hours.

If the fan dies, it's not very expensive to replace it. Besides, are you going to keep that fan for 6 years?

Sleeved could be very quite. The only problem is it's durability, and it's noise as it ages.

Hydro is better, although more costly. I believe it's quieter than sleeve, or at least it can retain it's quietness.

If we assume the worst, and get only 20,000 hours out of it, that would be 4.5years of use if you use it 12 hours a day.

In the best case scenario, if the fan does last for 40,000 hours, that would be 9 years of use if you use it 12 hours a day.

If you're that worried, why don't you go buy a replacement fan right now, saving it until the one in use dies?

Ah I was just wondering if that number was a serious number and what not... Usually on specs there are important stuff and stuff you have to ignore. I guess it kinda makes sense that a fan would last that long eh...? Ok then, I'll run that little sucker on high from the beginning

I oil my fan bearings when I service my box. Usually about once every three to five months. [/no carpet in the flat, so thank God! minimal dust]

Hey, I do that too. I makes the fan run smoother and faster.