While observing L10 life expectancy fan test data, I notice that there is approximately a 5% increase in the rotational speed of the unit from the time the test start and ends. This is for a ball bearing unit with a max flowrate of 23 CFM and runs at about 13,000 rpm @12v. It would seem to me that the bearing somehow get "broken in" to allow faster operation? Is there any truth to this? or is there some other reason for this change. It would seem to me that the bearings would run slower, not faster as more and more dirt, etc. gets in the bearing.
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