AlfaTech HVAC System Strategies for Airborne Diseases

H V A C S Y S T E M S T R A T E G I E S F o r A i r b o r n e D i s e a s e s

AIR FILTRATION – CENTRAL

The fraction of particles removed from air passing through a filter is

termed “filter efficiency” and is provided by the Minimum Efficiency

Reporting Value (MERV) under standard conditions.

• MERV 13 or greater are efficient at capturing airborne viruses.

•

MERV 14 filters are preferred.

• HEPA filter efficiencies are higher than MERV 16 but will have

higher pressure drops.

• Carbon filters are effective with chemical gasses but cannot be

utilized for capturing airborne viruses. Utilization of carbon filters on

outside air can be beneficial in areas with poor outside air quality.

Courtesy of ASHRAE Standard 52.2-2017