# Engineering Strategies for Airborne Diseases

H V A C S Y S T E M S T R A T E G I E S

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INCREASED VENTILATION – A MATHEMATICAL MODEL OF THE AIRFLOW ROLE ON AIRBORNE INFECTIONS

The Wells-Riley Equation

Nc: Number of new infections

S: Number of susceptible individuals

I: Number of infectors

Increased ventilation (Q) will reduce the number of new infections in the building

q: Number of infectious doses

p: Pulmonary ventilation rate per susceptible

t: Exposure time

Q: Flow rate of uncontaminated air

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