ASHRAE Standard 113 defines a method of testing air diffusion performance in the occupied zone of spaces such as offices or similar buildings. The method is designed for use in both prototype and field installations.

The revised 2022 edition

• removes directional anemometers from the acceptable test instruments in Section 5
• removed Draft Rating Method from Informative Appendix B
• adds new Section B2, "Air Diffusion Performance Index for Heating" to Informative Appendix B
• revises Informative Appendix C example calculations
• adds new Informative Appendix E, "Rotating Vane Anemometer Flow Measuring System"
• adds new Informative Appendix F, "Equations"
• adds new Informative Appendix G, "Informative References"
• Updates references