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<p class="MsoNormal"><span lang="DA" style="mso-fareast-language:EN-US">Hi<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">At DTU Nanolab we do not allow user provided masks in the cleanroom due to the fear of particle contamination. Users have to wear a provided mask preferably before entering the corridor
leading to gowning. Inside gowning a max of two persons is allowed. The combination of masks, high airflow and efficient HEPA filtering (quasi laminar air velocity is around 0.5 m/s downward) reduces the risk of infection to very unlikely.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">We have also studied the literature and have also found that single viruses do not survive ( i.e. dry out immediately) if not adsorbed to a particle or droplet. Hence HEPA filters are
extremely efficient and I fully agree that the cleanroom is probably one of the safest places to be regarding infection. No regular tests of staff or users are carried out.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">We have been running the cleanroom with a maximum of 50 persons inside (around 1300m2 of cleanroom) since May without infection event.
<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">We have had one staff member, who was subsequently tested positive, working inside the cleanroom (the staff member worked possibly several days in the cleanroom while infected until
he went home with syptoms and got tested). All rules and regulations were followed (mask, distancing), nobody else got infected. This is one data point and doesn’t allow any conclusions but still it is worth mentioning (the staff member had relatively mild
symptoms and was back at work after two weeks). <o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Distancing is a problem especially in training situations but here the high air velocity in combination with masks is helping us enormously. We are currently introducing headset intercoms
(inspired by Nanolab NL in Twente, NL) for training situations. This allows training situations without raising the voice in noisy environments thereby preventing unnecessary possible emission of viruses as well as proper distance. Of course proper hygiene
regarding the headsets is a must.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US">Best<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"> Jørg<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Jörg Hübner, Ph.D.</span></b><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Director</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">DTU Nanolab</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">National Centre for Nano Fabrication and Characterization</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Technical University of Denmark</span></b><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:8.0pt;font-family:"Arial",sans-serif">DTU Nanolab</span></b><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">National Centre for Nano Fabrication and Characterization</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Ørsteds Place</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Building 347, Room 178</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">2800 Kgs. Lyngby</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Denmark</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Direct +45 45255762</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif">Mobile +45 22785157</span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><u><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:blue"><a href="mailto:jhub@dtu.dk"><span style="color:purple">jhub@dtu.dk</span></a></span></u><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Arial",sans-serif"><a href="http://www.nanolab.dtu.dk/english"><span style="color:purple">www.nanolab.dtu.dk/english</span></a></span><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span lang="EN-GB" style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black"><labnetwork-bounces@mtl.mit.edu> on behalf of Tony L Olsen <tony.olsen@utah.edu><br>
<b>Date: </b>Wednesday, 16 December 2020 at 19.16<br>
<b>To: </b>Robert Vandusen <RobertVandusen@cunet.carleton.ca>, "labnetwork@mtl.mit.edu" <labnetwork@mtl.mit.edu><br>
<b>Subject: </b>Re: [labnetwork] Question about cleanroom mask policies<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Robert<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Early this summer, when the university began allowing folks back on campus, face masks were required. In fact, the university even provided a multi-layer cloth mask to ALL students, faculty, and staff. Most people use that mask, while
some have found other styles. I did not want anyone removing or replacing that mask to enter the cleanroom, so they continue to wear their own mask for the cleanroom. Frankly, I recognized that any user-provided mask (cloth or paper) may not be very effective
at particle filtering, but there are worse regular practices that compromise the cleanroom. We only double-mask (add a standard cleanroom snood) when the user’s mask does not cover all facial hair. I have no data to support our approach, but it seemed to
be a reasonable compromise to the current situation. The biggest problem has been the increased fogging of safety glasses. Social/physical distancing is still promoted, but poorly practiced.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I may be naïve, but I believe standard cleanroom protocols, frequent wipe downs of workstations, occupancy limits, and the high air exchange rate significantly reduce the risk of spread even when social distancing is problematic. Our cleanroom
reopened for limited use in May, including several lab courses during Fall Semester. To date, I am unaware of any lab member infected while using the cleanroom – although a few have been elsewhere.<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">tonyO<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">Tony Olsen<o:p></o:p></p>
<p class="MsoNormal">Nanofab Cleanroom Supervisor/Process Engineer<o:p></o:p></p>
<p class="MsoNormal">University of Utah<o:p></o:p></p>
<p class="MsoNormal">36 S Wasatch Drive, Suite 2500<o:p></o:p></p>
<p class="MsoNormal">Salt Lake City, UT 84112<o:p></o:p></p>
<p class="MsoNormal">801-587-0651<o:p></o:p></p>
<p class="MsoNormal"><a href="www.nanofab.utah.edu"><span style="color:blue">www.nanofab.utah.edu</span></a><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Robert Vandusen <RobertVandusen@cunet.carleton.ca>
<br>
<b>Sent:</b> Tuesday, December 15, 2020 10:29<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Question about cleanroom mask policies<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-CA">Hi all.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-CA">Hope this finds everyone safe.</span><o:p></o:p></p>
<p class="MsoNormal"><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.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-CA">So far we have just been wearing the standard cleanroom style masks.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-CA">Just wondering what other labs have been using.</span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-CA"> </span><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-CA">Thanks</span><o:p></o:p></p>
<p class="MsoNormal" style="background:white"><span lang="EN-CA" style="font-size:10.0pt;font-family:Helvetica;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><o:p></o:p></p>
<p class="MsoNormal"><span lang="EN-CA"> </span><o:p></o:p></p>
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