ASHRAE+62.1-2022+(1) - Page 023

Extracted Content

Table 6-3 Airstreams or Sources

Description Air Class

Kitchen grease hoods 4

Kitchen hoods other than grease hoods 3

Diazo printing equipment discharge 4

Hydraulic elevator machine room 2

Laboratory hoods 4

Paint spray booths 4

Refrigerating machinery rooms 3

Rp = outdoor airflow rate required per person as determined from Table 6-1 ( Informative Note: These values are based on adapted occupants.)

Ra = outdoor airflow rate required per unit area as determined from Table 6-1

Informative Notes:

1. Equation 6-1 accounts for people-related sources and area-related sources independently in the determination of the outdoor air rate required at the breathing zone. The use of Equation 6-1 in the context of this standard does not necessarily imply that simple addition of outdoor airflow rates for different sources can be applied to any other aspect of IAQ.
2. The rates in Table 6-1 are based on all other applicable requirements of this standard being met. If other requirements of the standard are not met, then the rates do not apply.

6.2.1.1.1 Unlisted Occupancy. Where the occupancy category for a proposed space or zone is not listed, the requirements for the listed occupancy category that is most similar in terms of occupant density, activities, and building construction shall be used.

6.2.1.1.2 Source Strengths. The VRP minimum rates are based on contaminant sources and source strengths that are typical for the listed occupancy categories. Where unusual sources are expected, the additional ventilation or air cleaning required shall be calculated using Section 6.3 or criteria established by the environmental health and safety (EHS) professional responsible to the owner.

Informative Notes:

1. Zones where emissions are expected from stored hazardous materials are not typical for any listed occupancy category.
2. Dry ice, theatrical smoke, and smoke-producing activities are not typical for any listed occupancy categories.

6.2.1.1.3 Air Density. Volumetric airflow rates are based on dry-air density of 0.075 lbda/ft [3]

(1.2 kgda/m [3] ) at a barometric pressure of 1 atm (101.3 kPa) and an air temperature of 70°F (21°C). Rates shall be permitted to be adjusted for actual density, but such adjustments are not required for compliance with this standard.

6.2.1.1.4 Dwelling and Sleeping Units. Air from one dwelling unit with transient occupancy, or air from one sleeping unit, shall not be recirculated or transferred to any other unit.

6.2.1.1.5 Laboratories. Laboratory spaces that comply with all requirements of ANSI/AIHA Z9.5 are not required to comply with the rates in Table 6-1.

6.2.1.1.6 Animal Facilities. Animal facilities that have completed a risk evaluation performed by the EHS professional responsible to the owner or to the owner’s designee are not required to comply with the rates in Table 6-1.

6.2.1.1.7 Design Zone Population. Design zone population ( Pz ) shall equal the largest (peak) number of people expected to occupy the ventilation zone during typical use.

Exceptions to 6.2.1.1.7:

1. Where the number of people expected to occupy the ventilation zone fluctuates, zone population equal to the average number of people shall be permitted, provided such average is determined in accordance with Section 6.2.5.2.
2. Where the largest or average number of people expected to occupy the ventilation zone cannot be established for a specific design, an estimated value for zone population shall be permitted,

ANSI/ASHRAE Standard 62.1-2022 21