International. ASHRAE announced the publication of new updated editions of its standards for ventilation system design and acceptable Indoor Air Quality (IAQ).
The ANSI/ASHRAE Standard 62.1-2019, Ventilation for Acceptable Indoor Air Quality, specifies minimum ventilation rates and other measures for new and existing buildings that are intended to provide IAQ that is acceptable to human occupants and that minimizes adverse health effects.
Significant changes to Standard 62.1 include:
- New informative tables of ventilation rates per unit area to verify ventilation calculations of new and existing buildings
- Simplified version of the ventilation rate procedure, which improves calculations for system ventilation efficiency and zone air distribution effectiveness
- Methodology for calculating the modified natural ventilation procedure
- Revised scope to specifically identify occupations that were not previously covered
- New requirement that natural ventilation consider outdoor air quality and the interaction of outside air with mechanically cooled spaces
- Humidity control requirements are now expressed as dew point rather than relative humidity
ANSI/ASHRAE Standard 62.2-2019, Ventilation and Acceptable Indoor Air Quality in Residential Buildings, defines the functions and minimum requirements for mechanical and natural ventilation systems and building envelope intended to provide acceptable indoor air quality in residential buildings.
The 2019 edition of Standard 62.2 adds a compliance path that gives credence to particle filtration, distinguishing between balanced and unbalanced ventilation system interactions with natural infiltration, requiring compartmentalization limits for new multifamily dwellings and allowing leak test results to be used. single-point wrapping when calculating the infiltration credit.
"These standards have undergone key changes over the years, reflecting the ever-increasing body of knowledge, experience and research related to ventilation and air quality," said Jennifer Isenbeck, president of SSPC 62.1. "The purpose of both standards remains unchanged, however, the means to achieve this goal have evolved. These updated standards will provide greater clarity, with the hope of creating healthier indoor environments for people in buildings."
For more information on Standards 62.1 and 62.2, visit www.ashrae.org/bookstore
