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Compressed gas proportioners designed to mix compressed air and oxygen to achieve oxygen concentrations of 21 percent to 100 percent at either high- or low-output flows. Typically, the device receives air and oxygen from the hospital gas pipeline or from other compressed gas sources. Oxygen-air proportioners are usually equipped with a pressure-regulating mechanism and connectors for the primary gas sources and the delivery of the blended gas. The mixed gas output can be passed through a humidifier or nebulizer and delivered to patients at flows ranging from 1 L/min to more than 100 L/min using ventilators, tracheostomy tubes, endotracheal tubes, oxygen tents, oxygen hoods, or masks. They are used in healthcare facilities, medical offices, and at home.
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