Know Your Oxygen-Delivery Masks 2

By Patty Seery
Nonrebreather Masks

Nonrebreather mask
Nonrebreather masks are a first-aid option for distressed injured divers who are unable to activate demand valves. These single-use, disposable masks feature an attached reservoir bag that captures the flow of oxygen to the mask to ensure a ready supply. These masks do not conform to faces as effectively as oronasal masks, however, so some oxygen escapes, and some ambient air enters the mask via perimeter gaps. As a result, injured divers using nonrebreather masks receive a lower fraction of oxygen compared with oronasal masks.



When using a nonrebreather mask, it is important to tighten the mask's elastic strap and adjust the nosepiece, but there is not much more rescuers can do to improve the mask's efficiency. Nonrebreather masks use a continuous flow of oxygen, which exhausts the oxygen supply more quickly than with other means of oxygen delivery.

Find the full article here: http://www.alertdiver.com/Oxygen-Delivery_Masks

© Alert Diver — Q1 Winter 2018

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