By code, medical air is defined by the characteristics related to the quality of the air being delivered. It needs to meet the United States Pharmacopeia (USP) requirements for medical air, as it is considered a manufactured drug that is directly administered to patients for internal use. The USP criteria for medical air specify the allowable range of the percentage of oxygen and also limits the amount of other compounds the medical air can contain. NFPA 99 further limits the amount of liquid and gaseous hydrocarbons in medical air, as well as the number of particulates sized 1 micron or greater.

While both medical air and instrument air have stringent quality criteria, they are two separate and distinct gases that are permitted for their own unique purposes. It might seem practical to simply use the pressurized air that is already available in a space for other purposes, but NFPA 99 is quite clear as to the limitations of their use.

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A question that is frequently asked within health care facilities across the country, and even the world, is whether medical air and instrument air can be used interchangeably. More specifically, the question usually surrounds if medical air can be used to power equipment, dry tools or a similar task, rather than if instrument air can be administered to patients.

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The annex of the code states that as a compressed air supply source, a medical air compressor should not be used to supply air for other purposes because such use could increase service interruptions, reduce service life and introduce additional opportunities for contamination.

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Like medical air, instrument air also has a required quality. This includes filtering to 0.01 micron, being free of liquids and hydrocarbon vapors, and dry to a dew point of -40 C (-40 F). These stringent criteria are in place so that it can safely power the sensitive equipment for which it is used. Instrument air is also utilized at a pressure of 160-185 psi, whereas medical air has a standard gauge pressure of 50-55 psi.

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Instrument air is permitted to be piped into areas intended for any medical support purpose and, if appropriate to the procedures, to be piped into laboratories. Additionally, it is permitted to be used for many general utility tasks such as to remove excess moisture from instruments before further processing, or to operate gas-driven booms, boom brakes, pendants or similar applications.

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The short and direct answer to both these questions is no. Medical air cannot be used in place of instrument air, and instrument air cannot be used in place of medical air. In fact, I would argue that within NFPA 99, Health Care Facilities Code,  this is the single concept most frequently repeated in different ways. Here, we will look at some of the specifics of each gas and the reasoning behind their limited applications.

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Instrument air is defined by the code as a medical support gas that, along with nitrogen, is intended for the powering of medical devices unrelated to human respiration. The definition even goes as far as to state that medical air and instrument air are distinct systems for mutually exclusive applications.

NFPA 99 clearly states that medical air be used only for air in the application of human respiration and calibration of medical devices for respiratory application.