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<p>Hi Joe,<br>
</p>
<p>We also have a bay and chase design with almost 100% HEPA
coverage in the ceiling. Our EHS folks measured the acoustic
levels a few years ago and got readings of ~73-75 dBA pretty
consistently across all the bays.</p>
<p>The exposure limit in BC is 85 dBA for 8 hr exposure and a
maximum peak exposure of 140 dBC.<br>
</p>
<p>Thanks,</p>
<p>Nathanael<br>
</p>
<div class="moz-cite-prefix">On 2025-03-18 5:40 p.m., N Shane
Patrick wrote:<br>
</div>
<blockquote type="cite"
cite="mid:B5908FC9-F2AD-493D-89DF-7DD1F5475544@uw.edu">
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Our facility is bay and chase, no subfab, so all the pumps and
chillers and all are right next door to the equipment. After a
recent request by one of our staff members, I did an informal
survey using NIOSH’s Sound Level Monitor app (NIOSH SLM) and an
uncalibrated microphone. The only time I got above 80db was when
people were talking or dropped things, even in our loudest
chases.
<div><br>
</div>
<div>Sustained levels at 85 or more are the levels of concern for
hearing loss according to US agencies. Our EHS team agreed with
me that even with an uncalibrated system we were very unlikely
to reach sustained levels of concern. People are still welcome
to use hearing protection for their own comfort, of course, and
I’d likely provide it for my staff if asked, but it takes a lot
to get to that sustained 85db point.</div>
<div><br>
</div>
<div>Now, 80db acoustics and the associated mechanical vibrations
from all of that is certainly enough to mess with sensitive
instruments, and we have had to relocate certain tools or just
accept our environmental noise translates to measurement noise.
That’s more a matter of design and space limitations for us than
anything else.</div>
<div><br>
</div>
<div>-N. Shane Patrick</div>
<div>Manager, Lab Operations and Safety</div>
<div>Washington Nanofabrication Facility<br>
<div><br>
</div>
<div><br id="lineBreakAtBeginningOfSignature">
<div dir="ltr">Sent from my iPhone</div>
<div dir="ltr"><br>
<blockquote type="cite">On Mar 18, 2025, at 5:26 PM, Joseph
Losby <a class="moz-txt-link-rfc2396E" href="mailto:joseph.losby@ucalgary.ca"><joseph.losby@ucalgary.ca></a> wrote:<br>
<br>
</blockquote>
</div>
<blockquote type="cite">
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Hi everyone,</div>
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<br>
</div>
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Have any of you taken acoustic noise measurements of
your cleanroom facilities, or have a basis of design for
acceptable levels? </div>
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<br>
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If you can share your facility ACH with noise level ( dB
) that would be great. Any other input will be much
appreciated as well. </div>
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<br>
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Cheers,</div>
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Joe</div>
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<br>
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