ASHRAE has released updated editions of its standards for ventilation system design and acceptable indoor air quality (IAQ).
ANSI/ASHRAE Standard 62.1-2019, Ventilation for Acceptable Indoor Air Quality, specifies minimum ventilation rates and other measures for new and existing buildings to foster IAQ that is acceptable to human occupants and that minimizes adverse health effects.
Significant changes include:
· New tables of ventilation rates per unit area for checking new and existing building ventilation calculations
· Simplified version of the Ventilation Rate Procedure
· Modified Natural Ventilation Procedure calculation methodology
· Revised scope to specifically identify occupancies previously not covered
· New requirement that natural ventilation consider the quality of the outdoor air and interaction of the outdoor air with mechanically cooled spaces
· Humidity control requirements now expressed as dew point instead of relative humidity
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. The standard also requires compartmentalization limits for new multifamily dwellings, and allows for single-point envelope leakage test results to be used when calculating infiltration credit.
Related Stories
Codes and Standards | Nov 29, 2016
New OSHA rules to reduce fall and trip hazards
Employers can choose from a variety of fall protection systems.
Codes and Standards | Nov 29, 2016
Seattle imposes new construction regulation to address rat problem
The city ranks first in U.S. in rat population.
Codes and Standards | Nov 28, 2016
Construction groups sue New York City over crane safety regulation
The rule bans cranes from operating when wind exceeds 30 mph.
Codes and Standards | Nov 28, 2016
Marines plan first net zero energy military base
The Albany, Ga., site will have ground source heat pumps and a biomass generator.
Codes and Standards | Nov 18, 2016
Mahesh Ramanujam takes reins as U.S. Green Building Council President and CEO
Ramanujam brings his tech and business consulting background to the post.
Codes and Standards | Nov 18, 2016
Canada GBC launching Zero Carbon Buildings Initiative
First step toward Zero Carbon Building Standard.
Codes and Standards | Nov 17, 2016
Santa Monica, Calif., passes historic net-zero ordinance
Includes more stringent commercial, multifamily building standards.
Codes and Standards | Nov 14, 2016
Six more states approve legal marijuana, creating opportunities for developers
Federal prohibition complicates the picture.
Codes and Standards | Nov 14, 2016
Los Angeles voters approve billions to tackle traffic and homelessness
The approved measures will create new rail lines and permanent housing.
Codes and Standards | Nov 9, 2016
NRMCA updates environmental impacts of concrete
The EPD now includes 88 companies, 72 mixes.