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Previous by Date: Subject: Re: [DCHAS-L] Sars-CoV2 infectivity Date: Tuesday, June 30, 2020 at 1:50:55 PM Author: Yaritza Brinker <YBrinker**At_Symbol_Here**FELE.COM> |
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I think we need to look at what these face coverings are made of. There is a great deal if variability in them, as far as I can tell. They are being offered with multiple layers and with pockets for filter inserts, which are sometimes advertised as carbon filters - rather inappropriate for particulates. As a result, I suspect that many of these coverings create excessive resistance to air flow, especially if pulled tight to the face, which is not the intent of public health authorities recommending them for source control.
Remember that N95s (without exhalation valves) and surgical masks have been used for years by people who wear them for extended periods without significant distress.
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 Yaritza Brinker
Sent: Tuesday, June 30, 2020 1:10 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Innovative face shields
COVID patients experience oxygen depravation well before they go to the hospital even though they appear lucid (see link). Thus, a device that further restricts a patient's available oxygen is just a bad idea.
https://www.health.state.mn.us/diseases/coronavirus/hcp/pulseoximetry.pdf
Thank you,
Yaritza Brinker
260.827.5402
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Wright, Mike
Sent: Saturday, June 27, 2020 9:33 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Innovative face shields
** External Email **
Based on personal experience I have to go with Monona on this one. Of course, I've never worn one of these particular enclosed face shields. But I have worn PAPRs with a neck shroud. If the pump fails, or you experiment with turning it off, after a few breaths breathing becomes pretty uncomfortable due to exhaled CO2. That's because of all the dead space in the helmet. With a cloth face mask, there's almost none.
Mike
Michael J. Wright
Director of Health, Safety and Environment
United Steelworkers
412-562-2580 office
412-370-0105 cell
"My friends, love is better than anger. Hope is better than fear. Optimism is better than despair. So let us be loving, hopeful and optimistic. And we'll change the world."
Jack Layton
From: ACS Division of Chemical Health and Safety [mailto:DCHAS-L**At_Symbol_Here**Princeton.EDU] On Behalf Of Kristi Ohr
Sent: Friday, June 26, 2020 4:14 PM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Innovative face shields
The fabric around the edges is cloth, so I really don't think it would be any harder than breathing through a cloth face covering. I think it's an interesting hybrid between face coverings and face shields that might be used to address a variety of situations that have been discussed here recently.
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU> On Behalf Of Monona Rossol
Sent: Friday, June 26, 2020 10:38 AM
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Subject: Re: [DCHAS-L] Innovative face shields
Gee that would be perfect if we didn't need oxygen. Each time you exhale in that thing your breath fills the space and some leaks out round the edges. When you inhale, you breathe in mostly what you just exhaled plus a little that leaks in from the sides. The CO2 level is going to rise and I give that patient about 4 minutes before there is some heavy breathing and a complaint made familiar by activists.
Note the video says it is just for moving patients from one place to another. Wouldn't work in a NYC hospital where you typically are grown over by moss while you wait in the hall on gurney.
Monona
-----Original Message-----
From: Kristi Ohr <kohr**At_Symbol_Here**UMASS.EDU>
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Sent: Fri, Jun 26, 2020 8:10 am
Subject: [DCHAS-L] Innovative face shields
This was posted on the ABSA listserv, and I thought there might be some interest in this community as well given recent discussions.
All the best,
Kristi
Sent from my iPad
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