ASHRAE STD 62.1
Ventilation for Acceptable Indoor Air Quality
|Publication Date:||22 June 2019|
Many manufacturing occupancies do not use hazardous materials. This addendum changes the air class for those spaces to Air Class 2, which allows the air to be recirculated to other similar manufacturing areas. Manufacturing spaces using hazardous materials will remain Air Class 3.
Note: In this addendum, changes to the current standard are indicated in the text by underlining (for additions) and (for deletions) unless the instructions specifically mention some other means of indicating the changes.