Previous by Date: Subject: Re: [DCHAS-L] Goggles & Face mask=fogging Date: Thursday, September 3, 2020 at 2:34:12 PM Author: Meg Osterby <megosterby**At_Symbol_Here**GMAIL.COM>
Thanks for posting this. I use quotes in my covid ppt from that Swiss investigation. And now, at long last, the Florida Atlantic University's engineering study from the Journal of Fluid Physics is on line and you can steal their video of a sneeze behind a shield which says it all. And the second part of that video are sneezes behind a mask with an exhalation valve which should also end that ridiculous idea.
The nice thing about this phase of the research is common sense is being supported. That means we get to say "nyah nyah nyah, I told you so" on occasion.
Monona
-----Original Message-----
From: Hunt, Alessandra <alehunt**At_Symbol_Here**MSU.EDU>
To: DCHAS-L**At_Symbol_Here**Princeton.EDU
Sent: Thu, Sep 3, 2020 12:00 pm
Subject: [DCHAS-L] Face shields and masks
A while ago there was a discussion about face shields not being enough and masks being really a key element in protection.
I am not sure this ahs already been shared but I came across this article that shows some evidence.
From: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
On Behalf Of James Keating Sent: Thursday, September 3, 2020 11:01 AM To: DCHAS-L**At_Symbol_Here**Princeton.EDU Subject: Re: [DCHAS-L] Goggles & Face mask=fogging
Barbara,
There are face shields available that include a small, battery powered, fan that keeps the face shield from foggy. This type of face shield also provides far better protection than cheaper options. These shields are typically equipped with
chin covering protecting against splash from all directions.
Goggles typically have vents to mitigate fogging. However, that is another subject. If the task has such a high risk for eye damage that goggles are necessary then why include holes in the sides or top of those goggles?
For high risk eye exposure I require employees to wear both safety glasses and a face.
Over the past 40 years I have personally worn and observed employees wearing all manner of face and eye protection.
Most fogging of safety glasses is a result of dirty glasses and moist exhaled air traveling up and under the glasses fogging the inside. Glasses that fit snuggly against the cheeks help reduce the effects of this moist breath. The outside
of the lenses rarely if ever fog.
PPE is always the last resort for hazard control and when necessary should include only the appropriate devices regardless of the cost.
MOUNTAINEER VALUES: Service
/Curiosity
/Respect
/Accountability
/Appreciation
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