Simple face mask

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The simple face mask (SFM) is a basic disposable mask, made of clear plastic, to provide

Unlike the non-rebreather and partial rebreather masks, the simple face mask lacks a reservoir bag. It also has holes in the mask instead of the non-rebreather's one-way valves, so ambient air can enter the mask. This feature eliminates the danger of suffocation present if a mask with one-way valves becomes disconnected from oxygen. Therefore, the simple face mask is commonly preferred by basic life support personnel such as firefighters, lifeguards and other non-medical rescue personnel trained in basic first aid.[1]

The final oxygen concentration delivered by a simple face mask is dependent upon the amount of room air that mixes with the oxygen the patient breathes. The air mixing is determined by how much air any individual is breathing at the moment, combined with the fit of the mask. Because of the variability in these factors, the final oxygen concentration is somewhat uncontrolled. A

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