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Previous by Date: Subject: [DCHAS-L] Efficacy of Face Shields Against Cough Aerosol Droplets from a Cough Simulator Date: Tuesday, August 4, 2020 at 11:03:00 AM Author: Yaritza Brinker <YBrinker**At_Symbol_Here**FELE.COM>

Next by Date: Subject: Re: [DCHAS-L] Efficacy of Face Shields Against Cough Aerosol Droplets from a Cough Simulator Date: Tue, 4 Aug 2020 17:10:17 +0000 Author: Monona Rossol

865nm is IR, germicidal UV (UV-C) is <280nm. Here are some resources on
UV-C disinfection of Covid-19.

Cheers!
Dave Lane
Principal
Clavis Technology Development

https://www.nature.com/articles/s41598-020-67211-2

https://iuva.org/iuva-covid-19-faq

https://www.americanultraviolet.com/germicidal-healthcare-solutions/uvc-for-coronavirus.html

On 8/3/20 2:48 PM, Bruce Van Scoy wrote:
> Alicia,
>
> Your right on with the problem, but I think we need to consider the
> increased impact of the reduction in outdoor air exchanges to increase
> energy efficiency over the last several decades. I have a location where
> employees are located every 6 ft. Although this meets the "recommended
> requirement" with what I know I would prefer either increased distances or a
> better method of room air disinfection. I wonder if anyone has looked at
> placing a UV light (I've forgotten the preferred wavelength, is it 865nm?)
> as a general room disinfection method? I am aware of the ACGIH TLV for UV,
> but I think this could be manageable.
>
> Thoughts?
>
> BruceV
>
>
>
> From: ACS Division of Chemical Health and Safety On
> Behalf Of Frazier, Alicia S
> Sent: Monday, August 3, 2020 3:11 PM
> To: DCHAS-L**At_Symbol_Here**Princeton.EDU
> Subject: Re: [DCHAS-L] [EXTERNAL] [DCHAS-L] Atlantic Article on Ventilation
>
>
>
> Most people, including the CDC, have been making all their guidance on
> assumptions that primary transmission is from large droplet entrainment of
> particulate which has never made sense to me. And the fact that clusters
> been in cruise ships, meat packing plants and choir rooms where people are
> in close prolonged contact in poorly ventilated areas points to spread by
> aerosolization. While HEPA filters or filters with MERV ratings of 15 or
> greater with an increase of outside air intake is not an absolute cure all
> it certainly would be a good place to begin to reduce the concentration of
> active virus particulate in the air, then address distancing and maximum
> number of people in a room.
>
>
>
> Alicia Frazier | 19100 Ridgewood Parkway | San Antonio, TX 78259
>
> Direct: 210-626-6615 | Mobile: 210-412-3253
>
>
>
> From: ACS Division of Chemical Health and Safety > > On Behalf Of Pam Auburn
> Sent: Friday, July 31, 2020 3:30 PM
> To: DCHAS-L**At_Symbol_Here**Princeton.EDU
> Subject: [EXTERNAL] [DCHAS-L] Atlantic Article on Ventilation
>
>
>
> I am certainly not an expert on this subject and have been thinking about it
> as we plan for a limited return to campus
>
>
>
> https://www.theatlantic.com/health/archive/2020/07/why-arent-we-talking-more
> -about-airborne-transmission/614737/?utm_source=newsletter
> <https://urldefense.com/v3/__https:/www.theatlantic.com/health/archive/2020/
> 07/why-arent-we-talking-more-about-airborne-transmission/614737/?utm_source=
> newsletter&utm_medium=email&utm_campaign=books-briefing-newsletter&utm_conte
> nt 200731&silverid-ref=NjYyNjM4MTUzMzIzS0__;!!KZqq5pzTuXXlyJ9BfQ!LvITImzoM
> u230n-Ui2_UtDWTity798JYH2loXaROrxIEa4Lm2_4xE62o9ZZcFAPmzu16efM$>
> &utm_medium=email&utm_campaign=books-briefing-newsletter&utm_content 20073
> 1&silverid-ref=NjYyNjM4MTUzMzIzS0
>
>
>
> This piece certainly did not "clear it up" but did placed some of the
> arguments in perspective
>
>
>
> Pamela Auburn, PhD
>
> 2041 Branard
>
> Houston TX 77098
>
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