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Subject: Re: [DCHAS-L] [EXTERNAL] [DCHAS-L] Atlantic Article on Ventilation
Date: Monday, August 3, 2020 at 3:56:12 PM
Author: Bob Weeks <00001333b76e6e14-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> 		Next by Date:
Subject: Re: [DCHAS-L] [EXTERNAL] [DCHAS-L] Atlantic Article on Ventilation
Date: Mon, 3 Aug 2020 21:26:45 +0000
Author: "Stuart, Ralph"

From: Ralph Froehlich <rfroehlich**At_Symbol_Here**HELIXENV.COM>
Subject: Re: [DCHAS-L] [EXTERNAL] [DCHAS-L] Atlantic Article on Ventilation
Date: Mon, 3 Aug 2020 16:06:09 -0400
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: 7D277C6D-0FB9-413F-B96F-7C88B486FECF**At_Symbol_Here**helixenv.com
In-Reply-To


A recent article in the Journal of Occupational and Environmental Hygiene (July 2020) reports that the routes of transmission to healthcare personnel from COVID-19 infected patients is predominated by inhalation (57%) and droplets (35%) compared to contact routes (8.2%). 


To link to this article: https://doi.org/10.1080/15459624.2020.1784427

Increased outdoor air supplies along with improved ventilation can be expected to reduce the dose of infectious viruses, but may not be adequate to prevent all infections.

Ralph A. Froehlich, CIH, CSP, QEP
Helix Environmental, Inc.
(937) 776-8435 cell

On Aug 3, 2020, at 3:11 PM, Frazier, Alicia S <ASFrazier**At_Symbol_Here**MARATHONPETROLEUM.COM> wrote:

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 <DCHAS-L**At_Symbol_Here**Princeton.EDU> 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
 
 
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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