Breathing-zone outdoor air calculator

Combines person-based and floor-area-based outdoor air requirements.

Units

V_{\text{bz}} = R_{p} \times P_{z} + R_{a} \times A_{z}

Calculator

Enter the values you know and leave one box empty. Calculate finds the empty one, the result or any input.

Given

V_{\text{bz}} = 5 \times 25 + 0.06 \times 1000 = 185

Symbol	Meaning	Unit
$V_{\text{bz}}$	breathing-zone outdoor airflow	cfm
$R_{p}$	people outdoor-air rate	cfm/person
$P_{z}$	zone population	person
$R_{a}$	area outdoor-air rate	cfm/ft²
$A_{z}$	zone floor area	ft²

Symbol	Meaning	Unit
$V_{\text{bz}}$	breathing-zone outdoor airflow	L/s
$R_{p}$	people outdoor-air rate	L/(s·person)
$P_{z}$	zone population	person
$R_{a}$	area outdoor-air rate	L/(s·m²)
$A_{z}$	zone floor area	m²

Results are estimates for study and screening. Check the inputs, units and assumptions before you use them for design, billing or contract decisions.