Great fans do not have to be expensive or come with price-increasing fan controls like PWM or manual/auto speed functions. The new T.B.SILENCE series complement ENERMAX’ current fan line-up by offering affordable silence without unnecessary speed controls while maintaining performance with ENERMAX’ patented Twister Bearing Technology. “Twister is a magnetic bearing type, which does not suffer from abrasion like mechanical bearings such as Sleeve or Ball-Bearings and has a longer lifetime of more than 100K hours.”