Work out ventilation rate instantly with clear inputs, formula shown and shareable results.
The ventilation rate procedure splits outdoor air demand into a people term and a building term: Vbz = Rp x Pz + Ra x Az. The people term dilutes occupant-generated contaminants such as carbon dioxide and odour; the area term handles emissions from furnishings and finishes that continue whether the space is occupied or not.
Breathing zone airflow
Vbz = Rp x Pz + Ra x Az
Preliminary estimate only. Confirm required rates and zone effectiveness against the ventilation standard adopted by your local code.
Vbz = Rp x Pz + Ra x Az. The ventilation rate procedure splits outdoor air demand into a people term and a building term: Vbz = Rp x Pz + Ra x Az.
No. The breathing zone value is divided by zone air distribution effectiveness and then combined across zones to give the outdoor air intake flow at the unit.
This calculator takes 4 inputs: Design occupancy, Zone floor area, Airflow per person (Rp), Airflow per area (Ra). The pre-filled defaults are a realistic worked example — replace them with your own site or project figures.