Dc motor: size is 3725mm, 3225mm. 2527mm, 5035mm ect, which can be used for air humidifier and other home appliance;reliable qua Dc brushless motor1)Size:3225, 3725,2527,5035,2)Speed:2800rpm ~9000rpm+/_10% without loading (also can design based on customers' requirement)3)Life:20000 hours to 50000 hours4)Any further detailed spec, please kindly contact us.