| O2 | Flow Rate Delivered | Percent O2 |
|---|---|---|
| Nasal cannula* | 1–6 L/min | 24%–44% |
| Simple mask | 6–10 L/min | 35%–55% |
| Non-rebreather mask | 6–15 L/min | 50%–90% |
| Venti mask (Venturi) | 3–15 L/min | 24%–50% |
| Bag-valve mask (ambu bag) | 15 L/min | 100% with reservoir |
* Nasal cannulas should be humidified when they are used for an extended time.
From Myers, E: RNotes. FA Davis, Philadelphia, 2010.