ASHRAE 241-2023 Control of Infectious Aerosols

On June 24, 2023, ASHRAE approved the publication of Standard 241-2023 Control of Infectious Aerosols. The purpose of Standard 241 is “to establish minimum requirements for control of infectious aerosols to reduce risk of disease transmission in the occupiable space” of buildings by defining “the amount of equivalent clean airflow necessary to substantially reduce the risk of disease transmission during infection risk management mode”. We provide a high-level overview of key aspects of the new standard as well as a discussion of its historical context and its potential impact on design and operation of buildings to achieve improved indoor air quality (IAQ)...