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Double ball bearings and hydraulic bearings with good closure Double ball bearings and hydraulic bearings are better closed, radial clearance especially for double ball bearings. Double ball bearings are embedded in the fan, the rotating part is not directly contact with the outside world. In the sealed environment, the working environment of the bearing is relatively stable.So the 5000 turn level large caliber fan almost double ball bearings. And the hydraulic bearing due to have a unique return type oil, so the possibility of lubricating oil leakage is small.