There is broad recognition of the importance of both indoor air quality (IAQ) and the need to lower buildings’ carbon emissions, and the signing To improve building energy efficiency and indoor air quality: the complexity of applying the IAQP. The publication of Addendum aa is significant because it directly addresses the largest barrier to using ASHRAE’s IAQ Procedure (IAQP) On February 14 ASHRAE published Addendum aa to Standard 62.1-2019, Ventilation for Acceptable Indoor Air Quality. and originally published on the enVerid blog: To purchase Standards 62.1 and 62.2, visit by Christian Weeks, CEO, enVerid Systems Inc. “These standards have undergone key changes over the years, reflecting the ever-expanding body of knowledge, experience and research related to ventilation and air quality,” said Jennifer Isenbeck, chair of SSPC 62.1. The 2019 edition of Standard 62.2 adds a compliance path that gives credit for particle filtration, distinguishing between balanced and unbalanced ventilation system interactions with natural infiltration, requiring compartmentalization limits for new multifamily dwellings, and allowing for single-point envelope leakage test results to be used when calculating infiltration credit. The standard, ANSI/ASHRAE Standard 62.2-2019, Ventilation and Acceptable Indoor Air Quality in Residential Buildings, defines roles and minimum requirements for mechanical and natural ventilation systems and the building envelope intended to provide acceptable indoor air quality in residential buildings. Humidity control requirements now expressed as dew point instead of relative humidity.A new requirement that natural ventilation consider the quality of the outdoor air and interaction of the outdoor air with mechanically cooled spaces.Revised scope to specifically identify occupancies previously not covered.A modified Natural Ventilation Procedure calculation methodology.A simplified version of the Ventilation Rate Procedure, improving calculations for system ventilation efficiency and zone air distribution effectiveness.New informative tables of ventilation rates per unit area for checking new and existing building ventilation calculations.The key changes to Standard 62.1 include: ASHRAE Releases Updated Ventilation and Indoor Air Quality StandardsĪSHRAE this month released updated editions of its standards for ventilation system design and acceptable indoor air quality (IAQ).ĪNSI/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.

Ashrae standard 62.1