On Jul 7, 2020, at 4:39 PM, Rupkey, Steve <00001179dcbb4345-dmarc-request**At_Symbol_Here**LISTS.PRINCETON.EDU> wrote:--- For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.org Follow us on Twitter **At_Symbol_Here**acsdchasYes, I'd like to see that study on MERV-15.Thanks,Steve
Monona-can you pls cite the study on MERV-15? I'm having trouble finding it-Many thanks,Margaret
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On Jul 7, 2020, at 10:10 AM, Monona Rossol <0000030664c37427-dmarc-request**At_Symbol_Here**lists.princeton.edu> wrote:All good advice except the MERV 13 filter recommendation. A study now shows the bug goes through a properly installed MERV15. So we are up to the full HEPA MERV 17 in our plans. And that makes for a system upgrade in most facilities. In a few cases, a shop with industrial dilution ventilation can be used -- which is even better..
We also, FYI, are finding that employers, if they really want to reopen, can find a way to test employees up to 3 times a week for COVID-19 (not antibodies, etc.) And we now require level A personnel (those who can't distance or wear a mask due to the nature of their work) be tested three times a week.
Others get tested once a week. And we are making it stick, Oh ye of little faith.
From: Stuart, Ralph <Ralph.Stuart**At_Symbol_Here**KEENE.EDU>
Sent: Tue, Jul 7, 2020 8:28 am
Subject: [DCHAS-L] ASHRAE guidance on Reopening Schools and UniversitiesCHAS readers many be interested in the link to the ASHRAE guidance on reopening schools and universities atIt's a good review of basic concepts and best practices related to institutional ventilation systems, which many people are suddenly interested in.
The challenge I see in using this document is that the design basis for this document is to dilution of (chemical) pollutants to negligible levels. I'm not sure that dilution is a good approach for biohazards such as virus which can survive on surfaces for hours after it is introduced into a space. In the BSL-3 labs I have helped evaluate, direction of air flow was more important than number of air changes per hour.
Ralph Stuart, CIH, CCHOEnvironmental Safety ManagerKeene State College603 358-2859
---For more information about the DCHAS-L e-mail list, contact the Divisional membership chair at membership**At_Symbol_Here**dchas.orgFollow us on Twitter **At_Symbol_Here**acsdchas
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