ASHRAE Journal - October 2021 - 38

TECHNICAL FEATURE
occupants, was able to contain the contaminant within
the source premises and remove the contaminant in
a timely manner. Similar dispersion patterns were
observed for the banquet case. However, due to the size
of the banquet table and occupant density in the banquet
setting, air purifiers with proper inlet/outlet locations
and flow rate need be further identified.
Conclusions
This research shows that using portable air purifiers
with HEPA filtration is an effective method to improve
air quality and to help mitigate airborne transmission
of pathogens. HEPA filtration is a proven technology
that is effective in removing 99.97% of harmful particles
from the air. They provide additional equivalent air
exchanges, which can reduce risk of transmission.
Installing portable air purifiers can be as efficient as
more elaborate solutions. They are easy to install and
require no modification of the existing heating and airconditioning
system. They are flexible and can be redeployed
as needs change. The cost of filters, maintenance
and energy should also be considered for any solution
including portable air purifiers.
Modeling studies demonstrated the most effectual
approach is to place the filtration as close to people as
possible. The intake and discharge of the units should
also be considered. Our studies used units with side
intake and top discharge. Units should not discharge
directly toward a person. Optimal location of portable
air purifiers will be in proximity to where people are
seated, congregate or queue, where they spend extended
periods or where adequate social distancing is difficult.
Examples include public space areas such as lobbies,
meetings spaces, restaurants, bars and check-in areas.
They are also ideal for areas like locker rooms, break
rooms, cafeterias and meeting rooms.
An additional benefit is an overall improvement of
air quality by removing dust, dander, pollen, smoke
and other particles that are problematic for those with
allergies or asthma. However, each space is unique and
needs to be assessed and addressed individually.
Acknowledgments
The research was supported by Marriott International.
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ASHRAE Journal - October 2021

Table of Contents for the Digital Edition of ASHRAE Journal - October 2021

Contents
ASHRAE Journal - October 2021 - Intro
ASHRAE Journal - October 2021 - Cover1
ASHRAE Journal - October 2021 - Cover2
ASHRAE Journal - October 2021 - 1
ASHRAE Journal - October 2021 - Contents
ASHRAE Journal - October 2021 - 3
ASHRAE Journal - October 2021 - 4
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ASHRAE Journal - October 2021 - HR1
ASHRAE Journal - October 2021 - HR2
ASHRAE Journal - October 2021 - HR3
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ASHRAE Journal - October 2021 - HR6
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ASHRAE Journal - October 2021 - Cover3
ASHRAE Journal - October 2021 - Cover4
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