ASHRAE Standard 41.2 provides recommended practices for airflow measurements as well as measurement procedures for use in preparation of other ASHRAE standards.

The 2022 edition of Standard 41.2 includes an update of the steady-state criteria for recording data, an addition that permits the optional use of legacy multiple-nozzle chambers that were specified in the original 1987 version of this standard (reaffirmed in 1992), and changes to make it easier for higher-tier ASHRAE standards to adopt this standard by reference.

Standard 41.2 meets ASHRAE’s mandatory language requirements.