From the service manuals posted in the 'sticky' part of this board: Head = 95% head, 5% foot Head/Foot = 60% head, 40% foot Foot = 20% head, 55% foot, 25% defrost Defrost/Foot = 15% head, 50% foot, 35% defrost Defrost = 7% head, 15% foot, 78% defrost and it says "Airflow always present at drive...