ASHRAE+62.1-2022+(1) - Page 028

Extracted Content

Table 6-5 Design Compounds, PM2.5, and Their Design Limits

Compound or PM2.5 Cognizant Authority Design Limit

Acetaldehyde Cal EPA CREL (June 2016) 140 µg/m [3]

Acetone AgBB LCI 1,200 µg/m [3]

Benzene Cal EPA CREL (June 2016) 3 µg/m [3]

Dichloromethane Cal EPA CREL (June 2016) 400 µg/m [3]

Formaldehyde Cal EPA 8-hour CREL (2004) 33 µg/m [3]

Naphthalene Cal EPA CREL (June 2016) 9 µg/m [3]

Phenol AgBB LCI 10 µg/m [3]

Tetrachloroethylene Cal EPA CREL (June 2016) 35 µg/m [3]

Toluene Cal EPA CREL (June 2016) 300 µg/m [3]

1,1,1-trichloroethane Cal EPA CREL (June 2016) 1000 µg/m [3]

Xylene, total AgBB LCI 500 µg/m [3]

Carbon monoxide U.S. EPA NAAQS 9 ppm

PM2.5 U.S. EPA NAAQS (annual mean) 12 µg/m [3]

Ozone U.S. EPA NAAQS 70 ppb

Ammonia Cal EPA CREL (June 2016) 200 µg/m [3]

Table 6-6 Mixtures of Compounds

Upper Respiratory Tract Irritation Eye Irritation Central Nervous System

Acetaldehyde Acetaldehyde Acetone

Acetone Acetone Dichloromethane

Xylene, total Formaldehyde Xylene, total

Ozone Xylene,total 1,1,1-trichloroethane

Ozone Toluene

Source: ACGIH (2017) (See Informative Appendix P, “Informative References”).

6.3.3.2 Perceived Indoor Air Quality. Zone outdoor airflow rates shall be sufficient to ensure that 80% or more of the people exposed do not express dissatisfaction with the quality of the air when tested as required in Section 7.3.2.

6.3.4 Combined IAQ Procedure and Ventilation Rate Procedure. The IAQP in conjunction with the VRP shall be permitted to be applied to a zone or system. In this case, the VRP shall be used to determine the required zone minimum outdoor airflow, and the IAQP shall be used to determine the additional outdoor air or air cleaning necessary to achieve the concentration limits of the contaminants and contaminant mixtures of concern.

Informative Note: The improvement of IAQ through the use of air cleaning or provision of additional outdoor air in conjunction with minimum ventilation rates may be quantified using the IAQP.

6.3.5 Documentation. Design documentation shall include the list of PM2.5, DCs, and DLs and mixtures thereof; outdoor source data; emission rates, including citations; cognizant authorities for any additional DCs; mass-balance calculations for each zone; and specifications for verification required by Section 7.3.

6.4 Natural Ventilation Procedure. Natural ventilation systems shall comply with the requirements of either Section 6.4.1 or 6.4.2. Designers shall provide interior air barriers, insulation, or other means that separate naturally ventilated spaces from mechanically cooled spaces to prevent high-dew-point outdoor air from coming into contact with mechanically cooled surfaces.

26 ANSI/ASHRAE Standard 62.1-2022