... delivery 5,Certificates(CE UL CUL TUV CCC AC SAA CSA EMC) Features: Size:92mm*92mm ... Bearing : "X"=S: One sleeve bearing( Duration :25,000h/25°C,p/vt) "X"=B: One ball bearing( ... Duration :50,000h/25°C,p/vt) "X"=L:Lashy bearing( Duration ... :45,000h/25°C,p/vt)---Patent MODELbearing SystemVoltage VFrrq HzCurrent ... st-motor.com 92*92*25.5mm ac axial flow fan