"220V Cooling Fan" double six nylon clamp, to prevent heat generated by fan operation 9225 led to clamp deformation stuck burn issues (Market fan clip is usually made of recycled materials, not temperature, is easy from the package, to prevent and the normal operation of the rotor blades). Mute super ball bearings, long service life, warranty period of two years. Ball is a ball fan key positions, (the electronic market with the ball ball fan generally poor, will produce different sound after a period of time, a serious ball will get stuck, causing the fan does not turn or burn-in, life is difficult to guarantee).