What is a key feature of the Continuous Flow Demand oxygen system?

The key feature of the Continuous Flow Demand oxygen system is that it provides a constant flow of oxygen. This means that the system delivers oxygen continuously rather than in response to inhalation effort, which is an important distinction. Continuous Flow Demand systems are designed to supply oxygen to the user at a set flow rate, ensuring that there is a consistent supply available for the pilot or passenger. This is crucial during flight operations, particularly at high altitudes where oxygen levels are diminished.

The other choices relate to other types of oxygen delivery systems or features that are not pertinent to the Continuous Flow Demand system. For instance, while a reservoir bag is associated with certain systems to reserve a supply of oxygen, it does not apply to the continuous flow design, where the focus is on steady oxygen delivery. Similarly, the mention of high pressures is more relevant to systems such as pressure demand oxygen delivery systems, which operate differently from a continuous flow setup.