ASHRAE STD 62.1
Ventilation for Acceptable Indoor Air Quality
|Publication Date:||26 June 2019|
Table 6.5, "Minimum Exhaust Rates," lists minimum exhaust rates for certain spaces in which contaminant generation has been deemed high enough that the contaminant cannot be diluted and thus needs to be exhausted. However, the standard does not require these spaces to be at any pressure. This addendum adds a requirement for these spaces to be at a negative pressure with respect to adjacent spaces in order to minimize contaminants leakage to adjacent spaces.
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.