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<p>Hi Travis,</p>
<p>At 4D LABS our facility is tied into the main house exhaust
system with stainless ducting. Tool exhausts, wetbenches, and gas
cabinets all go into this stream. We have local scrubbers for
extra hazardous materials. The exhaust system on the roof has 3
strobic fans and we would likely be ok with 2/3 running.</p>
<p>One tip I can offer is to always plan generously for future
expansion. It is very expensive and difficult to add exhaust
capacity after the main build.<br>
</p>
<p>Thanks,</p>
<p>Nathanael<br>
</p>
<div class="moz-cite-prefix">On 2025-02-24 6:23 p.m., Massey, Travis
wrote:<br>
</div>
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<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif">Hi all,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif">LLNL is
planning a significant cleanroom expansion, and the question
arose whether we
<i>need</i> separate exhaust for hoods and tools/gases, or
if they can be combined into a single shared exhaust. Or do
you have a single exhaust with 2+ exhaust fans pulling
simultaneously, so there’s always
<i>some </i>exhaust air moving if one fan is down? The
conventional wisdom around here has its share of holes, so
I’m out to learn from the broader nanofab cleanroom
community. How are your cleanrooms’ exhaust systems are
configured, especially if you’ve had to go down this
cleanroom design rabbit hole?<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif">I’m also
broadly open
<i>any</i> other lessons learned regarding provisioning
exhaust or other utilities – whatever you feel like
sharing. Too much information during the design phase is
far better than too little.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif"><br>
Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif">Travis
Massey<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif">Center
for Micro and Nano Technology (CMNT)<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Calibri",sans-serif">Lawrence
Livermore National Laboratory (LLNL)<o:p></o:p></span></p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
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Sieb</span> </b> <br
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