Simple Face Mask
The simple face mask sits over mouth and nose and often has a metal clip to fit the mask closer to the nosebridge and rubber bands to keep it in position.
It has openings in the side that allow expired air to exit.
A minimum of 5L/min is required to prevent re-breathing of CO2.
Flow rate: 5 - 10L/min.
FiO2: ~40 - 60%.
(FiO2 is variable since respiratory rate influences how much room air mixes with oxygen)
Advantages
- Allows higher flow rates
- Can be more comfortable for some patients
- Cam be used with nebulisers
Disadvantages
- Obstructs mouth and vision and needs to be removed to eat / drink
- Can be claustrophobic
- Variable FiO2 due to influence of the respiratory rate
