Simple face masks, Venturi masks, tracheostomy masks, partial re-breathing and non-rebreathing face masks, demand, diluter-demand and continuous flow are types of oxygen masks, according to the American Thoracic Society and Design Aerospace LLC. Oxygen masks cover the nose and mouth to deliver oxygen to the wearer, and the appropriate type of mask depends on its use, the size and age of the wearer and the amount of oxygen required.
Simple oxygen masks allow a patient to breathe in room air in addition to the oxygen that is supplied to the mask, according to ATI Nursing Education. Rebreathing and non-rebreathing masks have valves that regulate the flow of air so that exhaled air can leave the mask but room air coming into the mask is restricted. Re-breathing and non-rebreathing masks are low-flow oxygen delivery systems, according to Des Moines Community College. Some oxygen masks that mix oxygen with room air in various proportions, such as the Venturi, or entrainment, masks, are high-flow oxygen delivery systems, according to ATC.
Oxygen masks used on commercial airlines and in military aircraft include the continuous flow mask, which supplies a continuous flow of oxygen to the wearer, usually passengers in the cabin; diluter-demand, which supplies oxygen when the wearer inhales; and demand, which supplies the amount of oxygen needed based on the air pressure.