Augie RayMar 31, 2024
One of the health experts I follow is Dr. Sean Mullen. He is an Associate Professor within the Kinesiology & Community Health Department at the University of Illinois-Urbana-Champaign. He has a frightening but thoughtful #COVID19 message worth reading today on Twitter:
Show threadSFborn1940Mar 31, 2024
@augieray Portable air purification is compromised if the room it is used in is a part of the building HVAC system.
With this system air is circulated throughout the building with minimal filtrations. This negates the effect of portable purification devices. Hospitals use large, effective HEPA filters in their HVAC systems.
This is the only way to effectively clean the air used throughout a facility.
Show threadDavid ElfstromApr 1, 2024
@trainman @augieray No. In-room air cleaners add to overall effectiveness. See ASHRAE Standard 241, Control of Infectious Aerosols. Read-only version available at https://www.ashrae.org/technical-resources/standards-and-guidelines/read-only-versions-of-ashrae-standards
Read-Only Versions of ASHRAE Standards

Learn more about Read-Only Versions of ASHRAE Standards at ashrae.org

Show threadSFborn1940
@DavidElfstrom @augieray Yes, if the filter is tested to meet applicable ASHRAE standards.
Apr 1, 2024 at 3:51pmWeb