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Nathalie Ventilation Profile picture
@VentiloAngel
Dec 6 • 10 tweets • 3 min read • Read on X
1/When it comes to infection prevention, particularly for COVID-19 and other pathogens, it’s important to consider all scientifically-backed options, including air purification systems and UV disinfection.
2/ Organizations like ASHRAE 241 and the Harvard Healthy Building COVID-19 Risk Calculator recognize UV disinfection as a viable technology for infection control in indoor environments.
healthybuildings.hsph.harvard.edu/tools/covid-19…

ashrae.org/about/news/202… Image
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3/ ASHRAE 241 specifically identifies UV disinfection as an "equivalent" to mechanical ventilation for reducing infection risks in indoor spaces. This has been adopted as a standard for improving air quality in buildings ashrae.org/about/news/202…Image
4/ We need an approach based on logic, science, and facts. This includes recognizing the limits of our knowledge but also analyzing the risks of "doing nothing"
5/ 🤔 It's easy to talk about eliminating the risks of long-term UV exposure, but are we overlooking the risks of inaction? A much more virulent pathogen could potentially lead us into another pandemic, and ASHRAE 241 is one of the ways we can prevent future pandemics.
6/ Air purifiers and ventilation systems have their own risks, like the long-term effects of noise on health. That’s why a balanced approach is essential
7/ $$$ Additionally, UV disinfection is often a more affordable solution and can be the best option to meet ASHRAE 241 goals. It’s sometimes the only way to achieve similar results in air quality
8/ 🚫 If we reject UV disinfection solely based on concerns over long-term effects, we risk missing out on a practical and effective solution to real public health issues.
9/🔍 Science teaches us that everything has a cost, and even seemingly risk-free actions, like drinking water, can involve ingesting pollutants. No solution is perfect. Nothing prevents us from implementing a system while continuing to study its benefits and risks
10/ 🧑‍🔬 Instead of focusing only on the risks of UV, let’s use the best available data to make informed choices. Ongoing research will help refine and improve technologies to reduce long-term risks

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More from @VentiloAngel

Nathalie Ventilation Profile picture
Oct 12
Helplessness is one of the most challenging experiences for humans, just as it is for animals. This has been extensively studied, particularly in dogs. 🐶 #Helplessness #Psychology
👇
In the face of helplessness, Stoic philosophy offers a path: focus on what we can control, create an action plan, and accept with serenity what lies beyond our control. 🧘‍♂️ #Stoicism #Philosophy
However, in managing certain crises, like the virus, many people seem to have surrendered to the situation. 😔 #COVID19 #Resilience #CopingStrategies
Read 8 tweets
Nathalie Ventilation Profile picture
Sep 28
There’s a controversy around Nukit, who sells UV lamps to reduce viral transmission risks. What started as a simple customer post sharing their use of these lamps at an airport has spiraled into accusations of privilege, racism, and even doxxing. what’s really going on 👇

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The controversy began when a customer, @Kevski_Bray, shared a photo at an airport cafeteria, using a Nukit UV lamp during a mandatory trip. The post went viral, garnering hundreds of thousands of views, but the reactions were overwhelmingly negative



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Nukit sells highly effective UV lamps that reduce infectious aerosols, lowering the risk of viral transmission. People like me, suffering from long Covid, rely on these lamps to occasionally go out safely, especially when eating at restaurants where wearing a mask isn't possible.
Read 24 tweets
Nathalie Ventilation Profile picture
Sep 18
UV disinfection settings, pictures from study ….

Far-UVC: Technology Update with an Untapped Potential to Mitigate Airborne Infectionshttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC10704226/ Image
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A single, upper-room GUV fixture delivered the equivalent of 18–110 eACH, depending on the susceptibility of the test microbe and relative humidity ,whereas a single far-UVC fixture delivered 33–66 eACH
Read 9 tweets
Nathalie Ventilation Profile picture
Sep 12
Ventilation is a case-by-case situation and it could be very challenging, you give an example. The background noise is in the calculator i propose. You can use it to try a solution or a compromise for a specific situation.

For some challenging situation, UV will be a most 🧵
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I encourage people to use calculation tools to find personalized solutions for their workplace, school, or child’s daycare, etc. I helped my friend find solutions, and it was very challenging.
Traffic noise was an issue, and we had to run tests to figure out what level of window opening was acceptable. Of course, reducing the window opening decreases the airflow (CFM). It’s not that easy, but not too complicated either.
Read 8 tweets
Nathalie Ventilation Profile picture
Sep 11
I recently received a DM about the 45 dB figure I mentioned regarding noise levels in schools. This is a serious topic because noise pollution can significantly impact health and learning. Let me clarify where this figure comes from
🧵
The 45 dB figure is often discussed in the context of minimizing classroom noise to avoid disruptions and support effective learning. It’s a general reference rather than a strict standard.
For authoritative guidelines, the World Health Organization (WHO) and ANSI S12.60-2010 provide recommendations on noise levels. WHO suggests keeping noise below 35-40 dB to ensure a healthy and conducive learning environment.
Read 8 tweets
Nathalie Ventilation Profile picture
Sep 11
Updated Air Purifier Analysis
Refined analysis for classrooms (38 dB background noise, 200 CFM, 28 students).
Focus on dust CADR for ASHRAE 241 and ensure total noise max 45 dB. Compare quieter vs. louder models with new data. Check it ou #ASHRAE241 #45dB
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Thanks to @joeyfox85 and other person, I’ve adjusted the analysis to reflect that #ASHRAE241 considers infectious aerosols as 0.3x smoke + 0.4x dust + 0.3x pollen. Intertek tests show 5% of the dust CADR. This adjustment ensures more accurate evaluation and easier to meet goals
I’ve also added some devices, including a few that are installed in schools across North America and selected by government agencies : Dyson HPO4, Trio plus, IQAir HealthPro Plus, Medify MA-112 and Honeywell HPA300
Read 30 tweets

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