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Hi Adam,<br>
<br>
The two cleanrooms I helped build were set between 10 and 15 Pa.<br>
<br>
Cheers,<br>
<br>
Iulian<br>
<pre class="moz-signature" cols="72">iulian Codreanu, Ph.D.
Director, Nanofabrication Facility
University of Delaware
Harker ISE Lab, Room 163
221 Academy Street
Newark, DE 19716
302-831-2784
<a class="moz-txt-link-freetext" href="http://udnf.udel.edu">http://udnf.udel.edu</a></pre>
<div class="moz-cite-prefix">On 4/6/2022 7:14 PM, Albert William
(Bill) Flounders wrote:<br>
</div>
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cite="mid:CAHxjShk3iCLbCAuGQOxvXQ0iJzQVM8FU-UP8rvnCfnUVyoHvuA@mail.gmail.com">
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<div>Adam,</div>
<div>Interesting question.</div>
<div>Ours is set at 0.08 - 0.1 inches water column = 20-25 Pa</div>
<div>45 - 60 Pa seems excessive.</div>
<div><br>
</div>
<div>I reviewed "Cleanroom Technology" by William Whyte <br>
</div>
<div>(2nd Ed, pg 69) <br>
</div>
<div>"Differential pressure of 10 Pa between two cleanrooms, and
15 Pa <br>
</div>
<div>between a cleanroom and an unclassified area, are
reasonable <br>
</div>
<div>minimum design pressures."</div>
<div><br>
</div>
<div>I do not have data on particle count vs diff pressure.</div>
<div>When we above ~ 0.2 (50 Pa) our doors begin to have
trouble latching automatically.</div>
<div><br>
</div>
<div>Bill Flounders</div>
<div>UC Berkeley<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Wed, Apr 6, 2022 at 3:38 PM
Adam Pettigrew <<a href="mailto:apettigr@ualberta.ca"
moz-do-not-send="true" class="moz-txt-link-freetext">apettigr@ualberta.ca</a>>
wrote:<br>
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<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
<div dir="ltr">Hey All,
<div><br>
</div>
<div>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.</div>
<div><br>
</div>
<div>Thanks,</div>
<div>Adam<br clear="all">
<div><br>
</div>
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