Genuine Daikin 7900101 Indoor Fan Bearing Vibration Isolator is the isolator that cushions the indoor fan bearing, damping its vibration so it isn't passed into the unit's casing. When it perishes or is missing, the fan can rattle, run noisy, or transmit vibration. A genuine isolator damps the way your Daikin expects — where a non-genuine part can let vibration through.