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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The general rule of thumb with HEPA’s is at least a 20 year lifespan, the pre-filters take most of the contaminants out. As far as an indicator for when they need replacement, amperage draw on the fans should be baselined and checked at least annually for increased draw to maintain pressurization or if your setup uses variable frequency drives in a closed loop, look for an increase in speed over time. <o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> Steve<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><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> labnetwork-bounces@mtl.mit.edu [mailto:labnetwork-bounces@mtl.mit.edu] <b>On Behalf Of </b>Vicky Diadiuk<br><b>Sent:</b> Wednesday, September 26, 2012 7:51 AM<br><b>To:</b> Dennis Grimard<br><b>Cc:</b> labnetwork@mtl.mit.edu<br><b>Subject:</b> Re: [labnetwork] HEPA Filters<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>HI,<o:p></o:p></p><div><p class=MsoNormal> The answer for MTL is the same as EPFL's, except that our HEPAs have been unchanged since 1985 :)<o:p></o:p></p></div><div><p class=MsoNormal>Vicky<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal>On Sep 25, 2012, at 4:22 AM, Flückiger Philippe wrote:<o:p></o:p></p></div><p class=MsoNormal><br><br><o:p></o:p></p><div><div><p class=MsoNormal><span lang=FR-CH style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dear Denis,</span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=FR-CH style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Let me mention that EPFL is running with the original HEPA filters since 14 years (1998) and still reach the class 100 specifications.</span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>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.</span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Anyway, back to your question facilities would pay for this.</span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>With my very best regards,</span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Philippe</span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Dr Philippe Flückiger</span></i><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Director of Operations</span></i><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><a href="http://cmi.epfl.ch/">http://cmi.epfl.ch/</a></span></i><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><i><span style='font-size:10.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Phone +41 21 693 6695</span></i><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'> </span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><b><span lang=FR style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black'>De :</span></b><span class=apple-converted-space><span lang=FR style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black'> </span></span><span lang=FR style='font-size:10.0pt;font-family:"Tahoma","sans-serif";color:black'><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>]<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">labnetwork@mtl.mit.edu</a><br><b>Objet :</b><span class=apple-converted-space> </span>[labnetwork] HEPA Filters</span><span lang=FR-CH style='color:black'><o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=FR-CH style='color:black'> <o:p></o:p></span></p></div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>All:<o:p></o:p></span></p></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'> <o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>Do any of you have to pay for the replacement of your HEPA filters in your cleanrooms?<o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'> <o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>Thanks ...<br clear=all><o:p></o:p></span></p></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'> <o:p></o:p></span></p></div></div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>--<span class=apple-converted-space> </span><br>Dennis S Grimard, Ph.D<o:p></o:p></span></p></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>Managing Director, Lurie Nanofabrication Facility<o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'> <o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>University of Michigan<o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>1246D EECS Building<o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>1301 Beal Avenue<o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>Ann Arbor, MI 48109-2122<o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>(734) 368-7172 (Cell)<o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'>(734) 647-1781 (Fax)<o:p></o:p></span></p></div></div><div><div><p class=MsoNormal><span lang=FR-CH style='color:black'><a href="http://www.lnf.umich.edu" target="_blank">http://www.lnf.umich.edu</a><o:p></o:p></span></p></div></div><div><p class=MsoNormal><span lang=FR-CH style='color:black'> <o:p></o:p></span></p></div></div><p class=MsoNormal><span lang=FR-CH style='font-size:13.5pt;font-family:"Helvetica","sans-serif";color:black'>_______________________________________________<br>labnetwork mailing list<br><a href="mailto:labnetwork@mtl.mit.edu">labnetwork@mtl.mit.edu</a><br><a 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