Which oxygen delivery device is appropriate for an unresponsive person who is not breathing normally?

The most suitable oxygen delivery device for an unresponsive person who is not breathing normally is the CPR mask with oxygen inlet. This device allows trained responders to provide effective rescue breaths while also delivering supplemental oxygen. The CPR mask fits securely over the victim's mouth and nose, creating a seal that minimizes the risk of air escaping.

Additionally, it typically has a port where supplemental oxygen can be connected, enhancing the effectiveness of the breaths being administered. This is particularly important in an emergency situation where the individual is unresponsive and not breathing adequately, as higher concentrations of oxygen are crucial for resuscitation efforts.

Using a CPR mask with an oxygen inlet ensures that the rescuer can deliver life-saving breaths more effectively compared to other devices that may not provide the same level of assistance or oxygen concentration.