ASHRAE STANDARED 62.1 : 2019

Ventilation for Acceptable Indoor Air Quality

WHAT'S NEW ?

The following are among significant changes made in the 2019 edition of the standard:
• The scope is changed to remove commentary and to more specifically identify occupancies
previously not covered.
• Informative tables of ventilation rates per unit area are included for checking existing buildings
and design of new buildings.
• The Ventilation Rate Procedure is modified with a new simplified version for determining Ev
and a more robust option for determining values of Ez.
• The Natural Ventilation Procedure is significantly modified to provide a more accurate calculation
methodology and also define the process for designing an engineered system.
• Natural ventilation now requires considering the quality of the outdoor air and interaction
of the outdoor air with mechanically cooled spaces.• Air-cleaning devices that generate ozone are prohibited.
• Humidity control requirements are now expressed as dew point and not as relative humidity.
• The standard now defers to ANSI Z9.5 on ventilation for laboratories handling hazardous
materials.
• Patient care spaces in the scope of ASHRAE/ASHE Standard 170 now follow the requirements
of Standard 170; ancillary spaces not previously classified have been added.
For more specific information on these and other changes made to the standard, refer to
Informative Appendix O.
Standard 62.1 is updated on a regular basis using ASHRAE's continuous maintenance
procedures. Addenda are publicly reviewed, approved by ASHRAE and ANSI, and posted on
the ASHRAE website.

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