High Quality Bearing MotorUL Certified, Powerful, Quiet, Energy Efficient and Long Lasting. 1 year warranty. 100% Ball Bearing BlowerThe bearing type of this convection blower distribution fan srv7000-659 is 100% sealed ball bearing blowers, which is last longer and outperform cheaper sleeve bearing blowers. Sealed ball bearings require no additional maintenance, are less prone to the effects of heat, and will operate more quietly over their full lifetime.