<div dir="ltr"><div class="gmail_default" style="font-family:arial,sans-serif">Shimon,</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif">good morning. Here at UofMichigan we have both a raised floor cleanroom, and low side wall return cleanroom. The raised floor is a catch-all for all kinds of debris/pieces/parts, and unless you make a conscious effort to pull the floor and vacuum under there, it does collect. As the facility guy, I've spent many hours vacuuming that surface whenever we do work in that underfloor plenum space. Even with the amount of stuff it collects and extra work required to keep it clean, I still wouldn't trade it for the low side wall return section. The raised floor provides another level of flexibility in the fit up of tools when you have to route some type of utility up from the subfab. We can talk more if you'd like to further discuss it.</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div class="gmail_default" style="font-family:arial,sans-serif">Good luck with your design, now is the time to make the correct choices,</div><div class="gmail_default" style="font-family:arial,sans-serif"><br></div><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div>Dennis<span class="gmail_default" style="font-family:arial,sans-serif"> Schweiger</span></div><div><span class="gmail_default" style="font-family:arial,sans-serif">Facilities Superviser</span></div><div><span class="gmail_default" style="font-family:arial,sans-serif">University of Michigan/LNF</span></div><div> </div><div>734.647.2055 Ofc</div></div></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Dec 13, 2021 at 7:48 AM Shimon Eliav <<a href="mailto:shimonel@savion.huji.ac.il">shimonel@savion.huji.ac.il</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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<p class="MsoNormal">Hello Everybody,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">We are designing a new cleanroom and I think to use an elevated floor to accommodate part of the utilities and serve as air return path to the chase. The air-conditioning designers didn’t like the idea: they argue it is expensive and difficult
to clean.<u></u><u></u></p>
<p class="MsoNormal">What is your experience with this? How clean that space below the elevated floor?<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Thanks in advance for your input.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Regards,<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Shimon<u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:8pt">The Hebrew University of Jerusalem<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8pt">The Unit for Nano Fabrication - UNF<u></u><u></u></span></p>
<p class="MsoNormal"><span style="font-size:8pt">Jerusalem - ISRAEL</span><u></u><u></u></p>
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