ASHRAE 62.1 Ventilation Rate Procedure
Vbz = Rp x Pz + Ra x Az (Breathing Zone Outdoor Air)
Voz = Vbz / Ez (Zone Outdoor Air)
where Rp = per person rate, Ra = per area rate
ASHRAE Standard 62.1 uses a two-component approach: one based on occupancy (people) and one based on floor area (building emissions).