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<p class="MsoNormal">All,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Colorado State has done some extensive studies on the bioaerosol emmissions. They have done a couple of rounds and also have a white paper. It is very informative. Here is the link.<o:p></o:p></p>
<p class="MsoNormal"><a href="https://smtd.colostate.edu/reducing-bioaerosol-emissions-and-exposures-in-the-performing-arts/">https://smtd.colostate.edu/reducing-bioaerosol-emissions-and-exposures-in-the-performing-arts/</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Best Regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Bill<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Garamond",serif">Bill Rowe<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Garamond",serif">Research Engineer<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Garamond",serif">Purdue University<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Garamond",serif">Birck Nanotechnology Center<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Garamond",serif">1205 W. State Street<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Garamond",serif">West Lafayette, Indiana 47907<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Garamond",serif">Office</span><span style="font-size:12.0pt;font-family:"Garamond",serif">: (765)496-8389<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Garamond",serif">Cell: (765)427-3587<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Garamond",serif"><a href="mailto:wrowe@purdue.edu"><span style="color:#0563C1">wrowe@purdue.edu</span></a><o:p></o:p></span></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<div style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0in 0in">
<p class="MsoNormal" style="margin-left:.5in"><b>From:</b> labnetwork-bounces@mtl.mit.edu <labnetwork-bounces@mtl.mit.edu>
<b>On Behalf Of </b>Shimon Eliav<br>
<b>Sent:</b> Thursday, December 17, 2020 3:59 AM<br>
<b>To:</b> Tom Britton <tbritton@criticalsystemsinc.com><br>
<b>Cc:</b> labnetwork@mtl.mit.edu; Robert Vandusen <RobertVandusen@cunet.carleton.ca><br>
<b>Subject:</b> Re: [labnetwork] Question about cleanroom mask policies<o:p></o:p></p>
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</div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Hi Tom,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Answering your questions:<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">      
</span></span></span><![endif]><span style="color:#1F497D">I didn’t make those tests without the face cover, because to wear face cover was the rule for our clean room before the COVID crisis. So, I took this as the starting point.<o:p></o:p></span></p>
<p class="MsoListParagraph" style="margin-left:1.0in;text-indent:-.25in;mso-list:l2 level1 lfo2">
<![if !supportLists]><span style="color:#1F497D"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">      
</span></span></span><![endif]><span style="color:#1F497D">Regarding the virus size, I take into account that the virus is contained on drops that are much bigger than them. So, the particle size range used in the test should be OK.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Shimon<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Arial",sans-serif;color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="AR-SA" dir="RTL" style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b>From:</b> Tom Britton [<a href="mailto:tbritton@criticalsystemsinc.com">mailto:tbritton@criticalsystemsinc.com</a>]
<br>
<b>Sent:</b> Wednesday, 16 December 2020 17:46<br>
<b>To:</b> Shimon Eliav <<a href="mailto:shimonel@savion.huji.ac.il">shimonel@savion.huji.ac.il</a>>; Robert Vandusen <<a href="mailto:RobertVandusen@cunet.carleton.ca">RobertVandusen@cunet.carleton.ca</a>>;
<a href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a><br>
<b>Subject:</b> RE: Question about cleanroom mask policies<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F">Hello Shimon,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F">Thank you for putting this together. It is most helpful in times of mask wearing and social distancing with respect to COVID both in and out of
 the cleanroom. <o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F"><o:p> </o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:.5in">
<span style="font-family:"Century Gothic",sans-serif;color:#323E4F">Two questions, if I can ask:
<o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:0in;margin-right:0in;margin-bottom:6.0pt;margin-left:1.0in;text-indent:-.25in;mso-list:l1 level1 lfo5">
<![if !supportLists]><span style="font-family:"Century Gothic",sans-serif;color:#323E4F"><span style="mso-list:Ignore">1.<span style="font:7.0pt "Times New Roman"">   
</span></span></span><![endif]><span style="font-family:"Century Gothic",sans-serif;color:#323E4F">Did you start with a sample of measurements speaking without a mask from the same distances to see how much the mask helped against the baseline?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:1.0in;text-indent:-.25in;mso-list:l1 level1 lfo5">
<![if !supportLists]><span style="font-family:"Century Gothic",sans-serif;color:#323E4F"><span style="mso-list:Ignore">2.<span style="font:7.0pt "Times New Roman"">   
</span></span></span><![endif]><span style="font-family:"Century Gothic",sans-serif;color:#323E4F">Since the virus ranges in size from 50 to 200 nanometers (0.05 to 0.2 micron), how do you think the numbers would fare under your test with particles of this
 size?<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F">I wish all my UGIM friends and acquaintances a lovely and safe holiday season!<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F">Tom
<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F">Tom Britton<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F">Direct: 208.890.1417<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="font-family:"Century Gothic",sans-serif;color:#323E4F"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b>From:</b> <a href="mailto:labnetwork-bounces@mtl.mit.edu">
labnetwork-bounces@mtl.mit.edu</a> <<a href="mailto:labnetwork-bounces@mtl.mit.edu">labnetwork-bounces@mtl.mit.edu</a>>
<b>On Behalf Of </b>Shimon Eliav<br>
<b>Sent:</b> Wednesday, December 16, 2020 1:07 AM<br>
<b>To:</b> Robert Vandusen <<a href="mailto:RobertVandusen@cunet.carleton.ca">RobertVandusen@cunet.carleton.ca</a>>;
<a href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a><br>
<b>Subject:</b> Re: [labnetwork] Question about cleanroom mask policies<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Hi Robert,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">When we returned to work after the first lock-down, we asked ourselves what to do regarding masks/face covers.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Then I did a very simple experiment to check by myself how effective is a face-cover to contain the particles we generate during normal respiration or talking. See attached summary.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Today our policy is: every user comes with his/her own mask and must put the face cover over it. This “two layers” solution is more than enough inside the clean room (plus as much distancing
 is possible).<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Regards,<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D">Shimon<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;color:#1F497D">The Hebrew University of Jerusalem<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;color:#1F497D">The Unit for Nano Fabrication<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="font-size:8.0pt;color:#1F497D">Jerusalem - Israel<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal" style="margin-left:.5in"><b>From:</b> <a href="mailto:labnetwork-bounces@mtl.mit.edu">
labnetwork-bounces@mtl.mit.edu</a> [<a href="mailto:labnetwork-bounces@mtl.mit.edu">mailto:labnetwork-bounces@mtl.mit.edu</a>]
<b>On Behalf Of </b>Robert Vandusen<br>
<b>Sent:</b> Tuesday, 15 December 2020 19:29<br>
<b>To:</b> <a href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a><br>
<b>Subject:</b> [labnetwork] Question about cleanroom mask policies<o:p></o:p></p>
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<p class="MsoNormal" style="margin-left:.5in"><o:p> </o:p></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-CA">Hi all.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-CA">Hope this finds everyone safe.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-CA">Now that N95s are starting to become a bit more accessible, there has been some recent discussion within our labs about whether to adopt an N95 mask policy for new users and when distancing is
 a challenge.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-CA">So far we have just been wearing the standard cleanroom style masks.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-CA">Just wondering what other labs have been using.<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-CA"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-CA">Thanks<o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in;background:white"><span lang="EN-CA" style="font-size:10.0pt;font-family:"Helvetica",sans-serif;color:black;mso-fareast-language:EN-CA">Robert Vandusen<br>
Technical Officer, Microfabrication Lab<br>
Electronics Department<br>
Carleton University<br>
room: 4184 Mackenzie Building<br>
<a href="tel:613-520-2600"><span style="color:blue">613-520-2600</span></a> ext 5761<br>
<a href="mailto:Robert_vandusen@cunet.carleton.ca" target="_blank"><span style="color:blue">Robert_vandusen@cunet.carleton.ca</span></a></span><span lang="EN-CA" style="font-size:9.0pt;font-family:"Helvetica",sans-serif;mso-fareast-language:EN-CA"><o:p></o:p></span></p>
<p class="MsoNormal" style="margin-left:.5in"><span lang="EN-CA"><o:p> </o:p></span></p>
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