The Coronavirus is projected to overwhelm the capabilities of most hospital systems during the growth and peak of cases requiring mechanical ventilators. Most ventilators are in short supply and it maybe impossible in many countries to get more. As care is rationed many people are projected to die if not given ventilation at an Intensive Care Unit (ICU). The Rex Ventilator is a prototype design to explore low cost - high availability designs to help fill this gap in the system that would support the breathing of a patient who was unable to breath on their own.