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Subject: Re: [DCHAS-L] Exxtremely Cool Visual (not simulation) of Exhalation Streams
Date: Friday, December 11, 2020 at 3:01:06 PM
Author: "Rupkey, Steve" <00001179dcbb4345-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> 		Next by Date:
Subject: [DCHAS-L] NIOSH Technical Report P/N 2021-107: Filtering Facepiece Respirators with an Exhalation Valve: Measurements of Filtration Efficiency to Evaluate Their Potential for Source Control
Date: Fri, 11 Dec 2020 22:47:36 -0600
Author: John Callen

From: pzavon**At_Symbol_Here**ROCHESTER.RR.COM
Subject: Re: [DCHAS-L] Masks and Social Distancing
Date: Fri, 11 Dec 2020 21:20:23 -0500
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: 003b01d6d02d$59ba0fc0$0d2e2f40$**At_Symbol_Here**rochester.rr.com
In-Reply-To <9DD57B1F-9F54-4FB6-AE2B-D59DC6B90B63**At_Symbol_Here**gmail.com>


This study apparently did not consider the likely impact of room ventilation (air movement) on the travel of virus containing aerosols. That, I think, would reduce their apparent conclusion that a 6 foot distance reduces exposure to near zero.

 

 

Peter Zavon, CIH
Penfield, NY

PZAVON**At_Symbol_Here**Rochester.rr.com

 

 

From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of John Callen
Sent: Friday, December 11, 2020 10:31 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: [DCHAS-L] Masks and Social Distancing

 

ALL,

 

You might be interested in this new study on the subject topic in today's Insider newsletter I just received from the Mayo Clinic.

 

https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-research-confirms-critical-role-of-masks-in-preventing-covid-19-infection/

 

Please watch the discussion and simulation videos.

 

Comments?

 

Be Safe and Stay Healthy!

 

All My Best,

 

John B. Callen, Ph.D.

3M Personal Safety Division - Retired

ACS/DCHAS Founding Member

(312) 632-0195

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