ASHRAE Journal - February 2024 - 18
INFECTIOUS AEROSOL CONTROL
Column
Air Cleaning in
ASHRAE Standard 241
BY KATHLEEN OWEN, FELLOW ASHRAE; LINDA D. LEE, DR.PH., MEMBER ASHRAE
Everything helps in Standard 241, because ASHRAE's standard Control of Infectious
Aerosols allows a building owner or facilities manager to choose from multiple options
to meet the air needs required to provide the specific amounts of clean or cleaned
air per person in occupied spaces. Once the air needed by your building or space and
where it is needed are determined, you decide which solutions to use. You can bring
in outdoor air (assumed clean of human pathogens); reduce occupancy; or use air
filters, ultraviolet light (UV), reactive air cleaners (RAC) or other air cleaners to make
your building safer. Or you can use some combination of the above to get clean air.
In some cases, using air cleaners may be the most cost-effective and easiest way to
meet the clean air levels recommended by ASHRAE Standard 241 requirements and to
reduce infectious aerosol exposure in the occupied space.
This standard is intended to be implemented
when there are high levels of community spread of
communicable respiratory pathogens and a reason
to reduce the risk of continued spread of these
airborne pathogens. This status is called infection risk
management mode (IRMM) and is recommended by an
authority having jurisdiction (AHJ) to take measures to
safeguard human health.
The AHJ will vary across locations. The most likely
decision makers include the local, state or federal
health authorities or the Centers for Disease Control
and Prevention (CDC) and World Health Organization
(WHO), but it could be the facility infection
preventionist or industrial hygienist working with the
local health department. The AHJ could be anyone in a
position of authority over building operations or public
health acting on community spread of disease.
It is also possible to use the guidance in Standard
241 when IRMM is not in place, if desired. Building
readiness plans, including the information needed to
put Standard 241 into place, should be prepared well
in advance of the next public health emergency. That
way, you are prepared to implement IRMM. These plans
could be as simple as modifications to your current
emergency management plans, including response to
information on infectious aerosols.
Energy use optimization, air cleaner purchases
and simple instructions for implementation can be
Kathleen Owen is the engineering consultant/owner of Owen Air Filtration Consulting, LLC. Linda D. Lee, Dr.PH., is a consultant at Linda D Lee Healthcare Consulting LLC.
18
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ASHRAE Journal - February 2024
Table of Contents for the Digital Edition of ASHRAE Journal - February 2024
ASHRAE Journal - February 2024 - Intro
ASHRAE Journal - February 2024 - CT1
ASHRAE Journal - February 2024 - CT2
ASHRAE Journal - February 2024 - Cover1
ASHRAE Journal - February 2024 - Cover2
ASHRAE Journal - February 2024 - 1
ASHRAE Journal - February 2024 - 2
ASHRAE Journal - February 2024 - 3
ASHRAE Journal - February 2024 - 4
ASHRAE Journal - February 2024 - 5
ASHRAE Journal - February 2024 - 6
ASHRAE Journal - February 2024 - 7
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ASHRAE Journal - February 2024 - 17
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ASHRAE Journal - February 2024 - Cover3
ASHRAE Journal - February 2024 - Cover4
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