From: John Callen <jbcallen**At_Symbol_Here**GMAIL.COM>
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
Reply-To: ACS Division of Chemical Health and Safety <DCHAS-L**At_Symbol_Here**Princeton.EDU>
Message-ID: F0EA81F7-97D4-4374-BBF9-35C54725525E**At_Symbol_Here**


The subject study is "hot-off-the-press" and is worthy of your consideration.


This summary has PDF Link so you can read the entire report (attached below).


The Bottom Line : "These finds have important implications for guidance on source control and mitigation."

It maybe possible that this will open up a blocked avenue of RPE.

After review, I certainly welcome your comments.

Be Safe and Stay Healthy!

All My Best and Happy Holidays,

John B. Callen, Ph.D.
3M Personal Safety Division - Retired
ACS/DCHAS Founding Member
(312) 632-0195

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