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Colleagues,<br>
<br>
UC Berkeley can substantiate Phillippe Flückiger observations about
HEPA longevity. The Microlab began operations in 1984 and during its
26 year life-cycle we never had to replace a HEPA filter because of
particle loading. However, the pre-filters were replaced ~ every 2
years. I should qualify this by pointing out the HEPA's in use were
the common type, made of spun-borosilicate and were thus "tortuous
path filters" and not "absolute", i.e they operated by electrostatic
force rather than by absolute pore size. <br>
<br>
When and if the NanoLab, whose facilities supersede the Microlab
requires HEPA replacement it is likely we will have to pay for them.
The pre-filter replacements are covered by the Campus.<br>
<br>
Bob Hamilton <br>
<pre class="moz-signature" cols="60">Bob Hamilton
Marvel NanoLab
University of CA at Berkeley
Rm 520 Sutardja Dai Hall
Berkeley, CA 94720-1754
<a class="moz-txt-link-abbreviated" href="mailto:bob@eecs.berkeley.edu">bob@eecs.berkeley.edu</a>
(e-mail preferred)
510-809-8600
510-325-7557 (mobile - emergencies)
</pre>
<div class="moz-cite-prefix">Flückiger Philippe wrote:<br>
</div>
<blockquote
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Dear
Denis,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Let me mention that EPFL is running with the
original HEPA filters since 14 years (1998) and still reach
the class 100 specifications.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">EPFL has no plan to change the HEPA filters.
Only some pre-filters might be occasionally changed for
example after construction work in the area.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Anyway, back to your question facilities would
pay for this.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">With my very best regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Philippe<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><i><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Dr Philippe Flückiger<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Director of Operations<o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><a moz-do-not-send="true"
href="http://cmi.epfl.ch/">http://cmi.epfl.ch/</a><o:p></o:p></span></i></p>
<p class="MsoNormal"><i><span
style="font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US">Phone +41 21 693 6695</span></i><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"
lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="FR">De :</span></b><span
style="font-size:10.0pt;font-family:"Tahoma","sans-serif""
lang="FR"> <a class="moz-txt-link-abbreviated" href="mailto:labnetwork-bounces@mtl.mit.edu">labnetwork-bounces@mtl.mit.edu</a>
[<a class="moz-txt-link-freetext" href="mailto:labnetwork-bounces@mtl.mit.edu">mailto:labnetwork-bounces@mtl.mit.edu</a>]
<b>De la part de</b> Dennis Grimard<br>
<b>Envoyé :</b> vendredi 21 septembre 2012 00:17<br>
<b>À :</b> <a class="moz-txt-link-abbreviated" href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a><br>
<b>Objet :</b> [labnetwork] HEPA Filters<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">All:<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Do any of you have to pay for the
replacement of your HEPA filters in your cleanrooms?<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">Thanks ...<br clear="all">
<o:p></o:p></p>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<p class="MsoNormal">-- <br>
Dennis S Grimard, Ph.D<o:p></o:p></p>
<div>
<p class="MsoNormal">Managing Director, Lurie
Nanofabrication Facility<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">University of Michigan<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">1246D EECS Building<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">1301 Beal Avenue<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">Ann Arbor, MI 48109-2122<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">(734) 368-7172 (Cell)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">(734) 647-1781 (Fax)<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><a moz-do-not-send="true"
href="http://www.lnf.umich.edu" target="_blank">http://www.lnf.umich.edu</a><o:p></o:p></p>
</div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
</div>
<br>
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<br>
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</pre>
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