Rebreather Vs. Non-Rebreather Mask

ioxygen in hospital room image by buckwheat from

Oxygen is vital to human life. It makes up about 21 percent of the air (the rest is nitrogen and other gases). In emergency situations, medical professionals use special types of oxygen masks to help patients breathe more easily. The two types of masks you will see are rebreather and non-rebreather masks.

Rebreather Mask

A rebreather mask has a soft plastic reservoir bag attached at the end that saves one-third of a person’s exhaled air, while the rest of the air gets out via side ports covered with a one-way valve. This allows the person to “rebreathe” some of the carbon dioxide, which acts as a way to stimulate breathing.

Non-Rebreather Mask

A non-rebreather has several one-way valves in the side ports. This type of mask also has a reservoir bag attached, but the bag has a one-way valve that prevents the exhaled carbon dioxide from getting into the reservoir. This type of mask does not allow for the rebreathing of exhaled air because it escapes through the side ports.


The purpose of such masks is to deliver high amounts of oxygen to people during emergency situations, such as hypoxia (lack of oxygen), respiratory disease, cardiac disease, shock, trauma, severe blood loss and seizures.

Other Types of Masks

There are several other types of masks, including bag valve mask (a manual respirator that delivers pure oxygen to the patient), pet oxygen masks, aviator masks, masks used by those in an airplane in emergency situations, a self-contained breathing apparatus used by firefighters and masks used by mountain climbers.


Since oxygen is a flammable substance, there should always be a “No Smoking” sign posted when a person is receiving oxygen. Additionally, all electrical equipment should have grounding adaptors on the plugs to avoid sparks. Furthermore, people who use oxygen at home should be aware of all dangers involved, such as using the oxygen close to stoves or portable heating units. Oxygen tanks should also be held in a special cart to avoid bumping or dropping, as this could cause the tank to explode or become punctured.