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<p class="MsoNormal">Hi Adam<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">In my opinion, anything that is measurably positive is adequate to keep particles out, with diminishing returns above .05”WC.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">What is more important is control stability (set CFM offset, my strong preference vs control to DP), cascading gradients of connected spaces (vs pressure sinks of bio containment) and your risk tolerance.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">At MIT.nano: Pregown is +0.02” relative to public corridor -> Gowning is +0.02” relative to pre-gown -> Cleanroom is +0.02” relative to gown = Cleanroom 0.06-0.07”WC relative to public corridor.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Nicholas Menounos, </span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">PE, LEED AP </span><span style="font-size:8.0pt;font-family:"Arial",sans-serif;color:black">(he/him/his)</span><span style="color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Assistant Director of Infrastructure</span><span style="color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#212121"> </span></b><span style="color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:#212121">MIT.nano</span></b><span style="color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><b><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Massachusetts Institute of Technology</span></b><span style="color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">77 Massachusetts Ave, Bldg 12-4003</span><span style="color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Cambridge, MA 02139</span><span style="color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Cell: <a href="tel:+15089320938">(508) 932-0938</a></span><span style="color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Office: <a href="tel:+16172537234">(617) 253-7234</a></span><span style="color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal" style="background:white"><span style="font-size:9.0pt;font-family:"Arial",sans-serif;color:black">Email: <a href="mailto:Menounos@mit.edu">Menounos@mit.edu</a></span><span style="color:#212121"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b>From:</b> labnetwork <labnetwork-bounces@mtl.mit.edu> <b>
On Behalf Of </b>Adam Pettigrew<br>
<b>Sent:</b> Wednesday, April 6, 2022 3:53 PM<br>
<b>To:</b> labnetwork@mtl.mit.edu<br>
<b>Subject:</b> [labnetwork] Cleanroom Pressure Setpoint<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Hey All,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">I am curious what others have as a setpoint for their cleanroom pressure relative to an unclean or lower classification cleanroom. I have found some information which suggests 10-15Pa is more than sufficient. We have ours set quite high
at 60Pa but it typically sits at 45Pa. If you have tried adjusting the pressure, have you noticed any change in cleanliness/particle counts? Any information would be really appreciated.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Thanks,<o:p></o:p></p>
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<p class="MsoNormal">Adam<br clear="all">
<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">-- <o:p></o:p></p>
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<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Adam Pettigrew</span><span style="font-size:10.0pt;color:#222222"><o:p></o:p></span></p>
<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Systems Technician</span><span style="font-size:10.0pt;color:#222222"><o:p></o:p></span></p>
<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">University of Alberta - nanoFAB</span><span style="font-size:10.0pt;color:#222222"><o:p></o:p></span></p>
<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">W1-028A ECERF Building</span><span style="font-size:10.0pt;color:#222222"><o:p></o:p></span></p>
<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">9107 - 116 Street</span><span style="font-size:10.0pt;color:#222222"><o:p></o:p></span></p>
<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Edmonton, Alberta</span><span style="font-size:10.0pt;color:#222222"><o:p></o:p></span></p>
<p style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black">Canada T6G 2V4 Ph: 587-879-1514</span><span style="font-size:10.0pt;color:#222222"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:black"><a href="http://www.nanofab.ualberta.ca/" target="_blank"><span style="color:#1155CC">www.nanofab.ualberta.ca</span></a></span><span style="color:#222222"><o:p></o:p></span></p>
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