ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 21
PHOTO A. Air curtains installed at U.S. Bank
Stadium in Minneapolis. Photo courtesy of Mars Air Systems
Air Disinfection
Through a process known as ultraviolet germicidal
irradiation (UVGI), light in the UV-C spectrum has been
used to neutralize pathogens for more than 100 years.4,5
Traditionally, UV-C has been deployed away from hightraffi
c areas to minimize the risk of accidental human
exposure. When paired with an air curtain, however,
UV-C can be deployed safely in busy environments.
A typical UV package for an air curtain (Photo B) is
Pedestrians wear face masks as the sky over New
York City turns an eerie orange from smoke from
wildfi res burning in Canada the afternoon of June 7,
2023. New York State Gov. Kathy Hochul called the
worsening air quality " an emergency crisis. "
Credit: Michael Nagle/Xinhua/Alamy Live News
air-conditioning costs, and to provide environmental
separation by repelling dust and dirt, fumes, odors, and
fl ying insects.3 Now, evidence suggesting air curtains also
can play a role in maintaining IAQ is emerging.
This article will discuss results of two experiments:
one of an ultraviolet- (UV) lamp-equipped air curtain's
ability to disinfect air and one of an air curtain's effectiveness
in preventing airborne particulates from entering
a building.
www.amca.org
designed so that no light from the bulb directly escapes
the air curtain. Like all light, UV-C loses energy when
refl ected from most surfaces, so UV light refl ected from
the interior of an air curtain (often seen as a " blue glow " )
is not a safety concern.
For added safety, UV-resistant control equipment and
kill switches that automatically de-energize a light source
if an air curtain is opened can be installed. Further peace
of mind can be had by ensuring an entire UV-equipped
unit is certifi ed to conform to national and/or local safety
codes and standards, as some air curtains are certifi ed
for only standalone use.
Experiment. In a test of the effectiveness of a UV-Cequipped
air curtain under fi eld conditions, a unit with
two low-pressure lamps that generated light at a wavelength
of 253.7 nm was installed above the door inside
the walk-in cooler of a pizzeria in Los Angeles. The lamps
were powered around the clock, while the fan operated
at high speed when the cooler door was open and low
speed when the cooler door was closed. The theory was
2023 AMCA inmot ion
21
http://www.amca.org
ASHRAE Journal Supplement - AMCA InMotion - November 2023
Table of Contents for the Digital Edition of ASHRAE Journal Supplement - AMCA InMotion - November 2023
Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - BB1
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - BB2
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover1
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover2
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Contents
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 2
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 3
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 4
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 5
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 6
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 7
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 8
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 9
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 10
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 11
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 12
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 13
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 14
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 15
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 16
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 17
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 18
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 19
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 20
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 21
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 22
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 23
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 24
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 25
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 26
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 27
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 28
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 29
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 30
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 31
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 32
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 33
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 34
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 35
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - 36
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover3
ASHRAE Journal Supplement - AMCA InMotion - November 2023 - Cover4
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