Portable Ventilators are lightweight and can be moved easily from one place to another within the hospital. They are able to function in demanding environments with little maintenance. They provide long-term support for patients who do not require complex critical care ventilators. Typically, these portable ventilators drive air into the breathing circuit with a motor-driven piston or a turbine. In the home setting, O2 is usually delivered directly into the breathing circuit from a separate source, such as an O2 tank.