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Hello Philippe,
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<div>We too had our HEPA filters well beyond their expected life with no discernible loss in air quality. However, we saw that it became harder and harder for the air handlers to push the air through the filters, and the positive pressure differential in the
cleanrooms relative to the surrounding corridor became less and less. I.e., the filters were still working but they were definitely getting more and more clogged up. Eventually (after 18 years) we had no choice but to replace them. It was obviously very disruptive
to ongoing operations, but it couldn't be put off any longer.</div>
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<div>Since we had to shut down for a period anyway, we took the opportunity to add VFDs to the fan motors in the air handlers, which resulted in very significant energy cost reductions.</div>
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<div> -- John</div>
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<div apple-content-edited="true"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Arial; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Arial; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; ">
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<font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">-------------------------------------------------------------<br>
John S. Hughes Office: (217) 333-4674<br>
Associate Director FAX: (217) 244-6375<br>
Laboratory Operations <a href="mailto:hughes@illinois.edu">hughes@illinois.edu</a><br>
Micro and Nanotechnology Laboratory</span></font>
<div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">University of Illinois at Urbana-Champaign</span></font></div>
<div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">3114 Micro and Nanotechnology Laboratory<br>
208 North Wright Street<br>
Urbana, Illinois 61801 <a href="http://mntl.illinois.edu">http://mntl.illinois.edu</a></span></font></div>
<div><font class="Apple-style-span" size="3"><span class="Apple-style-span" style="font-size: 12px; ">-------------------------------------------------------------</span></font></div>
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<div>On Sep 25, 2012, at 3:22 AM, Flückiger Philippe <<a href="mailto:philippe.fluckiger@epfl.ch">philippe.fluckiger@epfl.ch</a>></div>
<div> wrote:</div>
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<div lang="FR-CH" link="blue" vlink="purple" style="font-family: Arial; font-size: medium; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; ">
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<span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Dear Denis,<o:p></o:p></span></div>
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<span style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">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></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">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></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Anyway, back to your question facilities would pay for this.<o:p></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">With my very best regards,<o:p></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Philippe<o:p></o:p></span></div>
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<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">
<i><span lang="EN-US" style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Dr Philippe Flückiger<o:p></o:p></span></i></div>
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<i><span lang="EN-US" style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Director of Operations<o:p></o:p></span></i></div>
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<i><span lang="EN-US" style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><a href="http://cmi.epfl.ch/" style="color: purple; text-decoration: underline; ">http://cmi.epfl.ch/</a><o:p></o:p></span></i></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">
<i><span lang="EN-US" style="font-size: 10pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); ">Phone +41 21 693 6695</span></i><span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "><o:p></o:p></span></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">
<span lang="EN-US" style="font-size: 11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125); "> </span></div>
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<b><span lang="FR" style="font-size: 10pt; font-family: Tahoma, sans-serif; ">De :</span></b><span lang="FR" style="font-size: 10pt; font-family: Tahoma, sans-serif; "><span class="Apple-converted-space"> </span><a href="mailto:labnetwork-bounces@mtl.mit.edu" style="color: purple; text-decoration: underline; ">labnetwork-bounces@mtl.mit.edu</a><span class="Apple-converted-space"> </span>[mailto:labnetwork-<a href="mailto:bounces@mtl.mit.edu" style="color: purple; text-decoration: underline; ">bounces@mtl.mit.edu</a>]<span class="Apple-converted-space"> </span><b>De
la part de</b><span class="Apple-converted-space"> </span>Dennis Grimard<br>
<b>Envoyé :</b><span class="Apple-converted-space"> </span>vendredi 21 septembre 2012 00:17<br>
<b>À :</b><span class="Apple-converted-space"> </span><a href="mailto:labnetwork@mtl.mit.edu" style="color: purple; text-decoration: underline; ">labnetwork@mtl.mit.edu</a><br>
<b>Objet :</b><span class="Apple-converted-space"> </span>[labnetwork] HEPA Filters<o:p></o:p></span></div>
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<o:p> </o:p></div>
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All:<o:p></o:p></div>
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<o:p> </o:p></div>
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Do any of you have to pay for the replacement of your HEPA filters in your cleanrooms?<o:p></o:p></div>
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<o:p> </o:p></div>
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Thanks ...<br clear="all">
<o:p></o:p></div>
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<o:p> </o:p></div>
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--<span class="Apple-converted-space"> </span><br>
Dennis S Grimard, Ph.D<o:p></o:p></div>
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<div style="margin: 0cm 0cm 0.0001pt; font-size: 12pt; font-family: 'Times New Roman', serif; ">
Managing Director, Lurie Nanofabrication Facility<o:p></o:p></div>
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<o:p> </o:p></div>
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University of Michigan<o:p></o:p></div>
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1246D EECS Building<o:p></o:p></div>
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1301 Beal Avenue<o:p></o:p></div>
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Ann Arbor, MI 48109-2122<o:p></o:p></div>
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(734) 368-7172 (Cell)<o:p></o:p></div>
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(734) 647-1781 (Fax)<o:p></o:p></div>
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<a href="http://www.lnf.umich.edu" target="_blank" style="color: purple; text-decoration: underline; ">http://www.lnf.umich.edu</a><o:p></o:p></div>
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<o:p> </o:p></div>
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