403.2 Zone Calculations. Ventilation zone parameters

shall be determined in accordance with Section 403.2.1 through Section 403.2.3 for each ventilation zone served by the ventilation system. [ASHRAE 62.1:6.2.2]

403.2.1 Breathing Zone Outdoor Airflow. The outdoor airflow required in the breathing zone of the occupiable space or spaces in a ventilation zone, i.e., the breathing zone outdoor airflow ( Vbz ), shall be not less than the value determined in accordance with Equation 403.2.1.

Vbz = Rp•Pz + Ra•Az (Equation 403.2.1)

Where:

Az = zone floor area: the net occupiable floor area of

the ventilation zone, square feet (m ² ).

Az = zone floor area: the net occupiable floor area of

the ventilation zone, square feet (m ² ). Pz = zone population: The number of people in the ven tilation zone during typical usage.

Pz = zone population: The number of people in the ven tilation zone during typical usage. Rp= outdoor airflow rate required per person as deter mined from Table 402.1.

Rp= outdoor airflow rate required per person as deter mined from Table 402.1. Ra= outdoor airflow rate required per unit area as

determined from Table 402.1. [ASHRAE

Ra= outdoor airflow rate required per unit area as

determined from Table 402.1. [ASHRAE 62.1:6.2.2.1] 403.2.2 Zone Air Distribution Effectiveness. The zone air distribution effectiveness ( Ez ) shall be not greater than the default value determined in accordance with Table 403.2.2. [ASHRAE 62.1:6.2.2.2] 403.2.3 Zone Outdoor Airflow. The zone outdoor airflow ( Voz ), i.e., the outdoor airflow rate that shall be provided to the ventilation zone by the supply air distribution system, shall be determined in accordance with Equation 403.2.3. [ASHRAE 62.1:6.2.2.3]

Voz = Vbz/Ez (Equation 403.2.3)

Voz = Vbz/Ez (Equation 403.2.3)