Genuine Fujitsu 9319232096 Indoor Diffuser / Lower Vane is the moulded vane across the indoor unit's air outlet that sets how far the air is thrown down into the room. Its angle is driven by the diffuser step motor on the indoor board and moves with the vertical airflow louvre, so a vane that is cracked, warped or off its drive leaves the air coming out at the wrong angle whatever you choose on the remote. A sound vane puts the air where you asked for it.