Discover and read the best of Twitter Threads about #ICFUST2023
Most recents (13)
[1]Looking to the future of Far-UVC
Catherine Noakes, University of Leeds
@CathNoakes
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Catherine Noakes, University of Leeds
@CathNoakes
#ICFUST
#ICFUST2023
[2]written in direct response to the conference (and during the conference) reminder: COVID has caused enormous caseload and death and pre COVID lower respiratory infection was already #4 cause of worldwide death.
[3] This is a huge health challenge worldwide
three vectors for air and infection: communicable diseases( TB measles, flu), opportunistic pathogens (aspergillusm, NTMs, etc), airborne role in other infections (mrsa, c diff, norovirus)
three vectors for air and infection: communicable diseases( TB measles, flu), opportunistic pathogens (aspergillusm, NTMs, etc), airborne role in other infections (mrsa, c diff, norovirus)
[1]How it goes forward: A blueprint for communication
with the public about GUV
Kathleen McPhaul, University of Maryland
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with the public about GUV
Kathleen McPhaul, University of Maryland
#ICFUST
#ICFUST2023
[2] (First shout to Balvi for the support on this one! (
Going to address health literacy. The context is the extreme importance of getting the messaging right and letting this space make the change it can
Going to address health literacy. The context is the extreme importance of getting the messaging right and letting this space make the change it can
[3] Examples of health messaging that went off track from a public health messaging perspective:
mask effectiveness: they work, they worked, that message was missed. Vaccinations work, but the term "break through" diminished (as opposed to "saving lives, decreasing illness, etc"
mask effectiveness: they work, they worked, that message was missed. Vaccinations work, but the term "break through" diminished (as opposed to "saving lives, decreasing illness, etc"
[1] Roundtable discussion with participants from both governmental and non-governmental agencies on future regulatory pathways for Far-UVC
#ICFUST
#ICFUST2023
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[2] Moderator: Lew Radonovich (CDC, NIST)
Participants: Belal Abboushi (Pacific Northwest National Laboratory), Aline Heffernan (EPA Office of Pesticide Programs), Cameron Miller (NIST), David Sliney (perspectives from ACGIH), Richard Vincent (perspectives from ASHRAE)
Participants: Belal Abboushi (Pacific Northwest National Laboratory), Aline Heffernan (EPA Office of Pesticide Programs), Cameron Miller (NIST), David Sliney (perspectives from ACGIH), Richard Vincent (perspectives from ASHRAE)
[3] Lew Radonovich (CDC) opens that we will discuss the regulatory space(or really lack of)
NIOSH in US is focused on occupational safety and health, seek knowledge and apply it to the workplace. Will move through the panel now.
NIOSH in US is focused on occupational safety and health, seek knowledge and apply it to the workplace. Will move through the panel now.
[1] Accurate germicidal efficacy and photobiological hazard measurement of far-UVC sources.
Mike Clark, Gigahertz Optik GmbH
#ICFUST2023
#ICFUST
Mike Clark, Gigahertz Optik GmbH
#ICFUST2023
#ICFUST
[2] Need better meters especially between fluence and irradiance. UV radiomerters - widely used, convenient
UVspectroradiometers - much more comprehensive
UVspectroradiometers - much more comprehensive
[3] Radiometers often calibrated for near radiation. Most commercial radiometers don't cover the range of Far UV-C. Also need to match spectral response to wavelength of interest or big errors. Knowledge of light source used in calibration is very important!
[1] Impact of test methods on Far-UVC performance against bioaerosols
Katherine Ratliff, U.S. Environmental Protection Agency
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Katherine Ratliff, U.S. Environmental Protection Agency
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#ICFUST2023
[2] How effect? how to compare tech types? How can lab results be used to inform predictions?
How do extrapolate lab tests to real world applications?
How do extrapolate lab tests to real world applications?
[3] Use large bioaerosol test chamber(10x12x25 feet) with mock HVAC system.
Use MS2 as surrogate, and most importantly also did replicates.
Quantify log reduction and CADR of 222nm lamps and portable HEPA air cleaners.
Use MS2 as surrogate, and most importantly also did replicates.
Quantify log reduction and CADR of 222nm lamps and portable HEPA air cleaners.
[1]Far-UV Air disinfection performance testing standards
Wladyslaw Kowalski, Sanuvox
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Wladyslaw Kowalski, Sanuvox
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#ICFUST2023
[2] Opening with ASHREA 241P, target for 4-6 ACH, also opens door to eACH considerations which is good.
How do compare tech?
Watts/eACH?
$/eACH?
Risk/eACH?
Note uses EAC(but I am going to use eACH since I feel we see that more).
How do compare tech?
Watts/eACH?
$/eACH?
Risk/eACH?
Note uses EAC(but I am going to use eACH since I feel we see that more).
[3] Performance standards can be use to determine eACH. Going through in-duct performance, and is fairly straight forward to convert to eACH.
In room standards:
AHAM AC-5, ASTM, ASHREA[too fast for me to type all]
In room standards:
AHAM AC-5, ASTM, ASHREA[too fast for me to type all]
[1]Regulatory framework surrounding UV-C and influencers to the regulatory process
Paul Jensen, Final Approach Inc.
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Paul Jensen, Final Approach Inc.
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#ICFUST2023
[2] video: Budlight pilot video
Need to balance risk with benefit, as well as cost and benefit. Risks of secondary adverse health effect, and need to look at the whole picture.
Need to balance risk with benefit, as well as cost and benefit. Risks of secondary adverse health effect, and need to look at the whole picture.
[3]Risk of infection w/ no intervention, risk w/ intervention, risk of transient health effects
risk of secondary health effects (VOC ozone)
Risk of reduction in UV-C dose to lower secondary (ozone and VOC risk)
risk of secondary health effects (VOC ozone)
Risk of reduction in UV-C dose to lower secondary (ozone and VOC risk)
[1]Synergistic efficacy of dual Far-UVC and blue-light LED Light: The Future of Disinfection
Amanda Gardener, AgResearch Ltd
#ICFUST2023
Amanda Gardener, AgResearch Ltd
#ICFUST2023
[2] How well does 222nm, 254nm, 265nm all coupled with 405nm blue LEDs work? Used Feline Infectious Peritonitis Virus as surrogate, along with a saliva solution and put on various surfaces. Based line recovery with control groups and could recapture virus on surfaces deposited
[3] Metal found to have higher disinfection, likely due to reflection. Dried virus harder to inactivates vs wet. With E.Coli surrogate showed some boost with additional exposure to blue LED, notably worked against antibiotic resistant bacteria too. Again all surface focused.
[1] Inactivation of Airborne SARS-CoV-2 by 222 nm far-UVC irraditation
Hiroki Kitagawa, Hiroshima University Hospital
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Hiroki Kitagawa, Hiroshima University Hospital
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[2] Wild Type SARS-COV-2 aerosolized into a large 18 liter chamber, similar to Brenners chamber at Columbia. They arrived at a Log 10 reduction of 1.1 cm^2/mJ
[3] Also 222nm inactivation was used in solution, and K=0.73, but in a more dilute condition k=1.04. On dried surface they got k=1.05
[1]Far-UVC (222nm) efficiently inactivates microorganisms in the air and on surfaces and produces ozone in a single-bed-sized chamber
Waseem Hiwar, University of Leeds
#ICFUST2023
Waseem Hiwar, University of Leeds
#ICFUST2023
[2] This is a pre-recorded presentation. A mock room simulation looking at deactivating S. aurus and another pathogen(missed it) with 222nm. Collected aerosol using a Anderson 6 stage impactor and ozone monitored using 2B Tech(this is the right device to use!)[
[3] Missed irradiance level but think it was 4.0 mJ/cm^2. In this experience ACH in space was ramped from 1.5 to 9 eACH while lights were on. Reduction rates for different ACH was 95+%. Some impact to ACH on disinfection.
[2] UV inactivation kinetics:
282nm & 270nm LED, 254nm Hg lamp and 222 nm KrCl excimer tested in liquid solution in petri dish. Most effective was unfiltered KrCl with k=1.52 cm^2/mJ. LED's at 0.93 and 0.73 respectively
Note correction used for absorption of UV due to apparatus
282nm & 270nm LED, 254nm Hg lamp and 222 nm KrCl excimer tested in liquid solution in petri dish. Most effective was unfiltered KrCl with k=1.52 cm^2/mJ. LED's at 0.93 and 0.73 respectively
Note correction used for absorption of UV due to apparatus
[3] Filtered got 1.42 cm^2/mJ, and likely would be needed for occupied space use. Tested Phi6, HCOV229E, MHV and SARS-COV-2. Good news is COV-2 was easiest to kill and similar to HCOV 229E, meaning can use a surrogate and easier to deal with.
[1] Why Do We Need to (and How Do We) Improve Indoor Air Quality
Dr. Shelly Miller, University of Colorado
#ICFUST2023
Dr. Shelly Miller, University of Colorado
#ICFUST2023
[2] "There is no safe PM2.5 level, even down to 1ug/m3"
“Exposure to Ozone Increase the Risk of Death from Respiratory Causes"
“Exposure to Ozone Increase the Risk of Death from Respiratory Causes"
[3] Outdoor air pollution is dominated by combustion sources, cars and also wildfires too
[2]Historical upper room studies show effectiveness, but variation in how effective as hard to study in practice
[3]Far-UVC promising due to safer for human wavelengths allowing for whole room exposure. Shorter wavelength light absorbed better in proteins(more disinfection). 222nm around 10x more adsorption by proteins than 254nm
