All About the Mean Age of Air

Watch this video to learn more about the mean age of air from Dr. Jeff Franklin, P.E.

The “Mean Age of Air” is a concept that finds its roots in the HVAC industry. In designing a building airflow system, an HVAC professional looks at the exchange rate of a room, a measure of how quickly the room air is evacuated when the supply/return air flow engages. Ideally, multiple “air changes” would take place per hour, with higher rates depending on the type of space, be it warehouse, office, or laboratory. The exchange rate is determined through a basic handbook calculation that takes the flow rate divided by the volume of the room. This value might be useful for general comparisons, but the oversimplification does not account for room geometry, stagnation zones, or short-circuiting flow patterns. The Mean Age of Air helps to shed some light on these issues.

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