ASHRAE Standard 241-2023 PDF

Scope: Establishes minimum requirements for control of infectious aerosols to reduce risk of disease transmission in the occupiable space in new buildings, existing buildings, and major renovations to existing buildings, including requirements for both outdoor air system and air cleaning system design, installation, commissioning, operation, and maintenance. Defines the amount of equivalent clean airflow necessary to substantially reduce the risk of disease transmission during infection risk management mode. This standard a) Does not address requirements for maintaining acceptable indoor air quality; b) May not substantially reduce transmission risk in all situations due to the diversity of infectious agents and personal susceptibility and c) Addresses only indoor long-range transmission resulting from inhalation of infectious aerosol emitted by an infector who is not in close proximity to a susceptible occupant. Dual units of measurement.

ASHRAE Standard 241-2023 history