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Estimating real-time infiltration for use in residential ventilation control



Lisa Ng, Stephen M. Zimmerman, Jeremy Good, Brian Tool, Steven Emmerich, Andrew Persily


Minimum outdoor air ventilation rates specified in standards such as ASHRAE Standard 62.2 are generally based on envelope airtightness, building floor area, geographical location, and number of occupants. To meet ventilation requirements in practice, simple on/off controls and operating schedules are most commonly used to maintain the required ventilation rate. Ideally, minimum outdoor ventilation rates should account for unintentional leakage through the building envelope, or "infiltration." ASHRAE Standard 62.2-2016 allows for an infiltration credit, which reduces the required mechanical ventilation. However, infiltration rates vary based on the indoor-outdoor temperature difference, wind, and system operation
Technical Note (NIST TN) - 2046
Report Number


CONTAM, simplified airflow modeling, residential ventilation, real-time infiltration, energy use, exposure factor, ASHRAE Standard 62.2


Ng, L. , Zimmerman, S. , Good, J. , Tool, B. , Emmerich, S. and Persily, A. (2019), Estimating real-time infiltration for use in residential ventilation control, Technical Note (NIST TN), National Institute of Standards and Technology, Gaithersburg, MD, [online], (Accessed May 28, 2024)


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Created June 17, 2019, Updated March 1, 2021