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This standard defines a method of measuring air-change effectiveness in mechanically ventilated buildings or spaces. The method involves an age-of-air approach to air-change effectiveness and employs tracer gas procedures to measure the age of air. The age of the air at a given location is the average amount of time that has elapsed since the air molecules at that location entered the building. The definition of air-change effectiveness is based on a comparison of the age of air in the occupied portions of the building to the age of air that would exist under conditions of perfect mixing of the ventilation air.


Document History

  1. ASHRAE 129-1997 (RA 2002)

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    Standard 129-1997 (RA 2002) -- Measuring Air Change Effectiveness

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  2. ASHRAE 129-1997

    Standard 129-1997 -- Measuring-Air Change Effectiveness (ANSI approved)

    • Historical Version