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<div class="moz-cite-prefix">Hi Jacob.<br>
<br>
I assume the sequence mentioned applies to smoke detected in the
cleanroom space and not to every "building-level" fire alarm. In
that particular situation my cleanroom would go negative (-0.05"
WC) but the initiation of what we call the "smoke purge sequence"
is a manual process - folks have to think things through before
pushing the "cleanroom purge" button.<br>
<br>
Hope this helps.<br>
<br>
Iulian<br>
<pre class="moz-signature" cols="72">iulian Codreanu, Ph.D.
Director of Operations, UD NanoFab
University of Delaware
163 ISE Lab
221 Academy Street
Newark, DE 19716
302-831-2784</pre>
On 8/1/2014 7:43 AM, Jacob Trevino wrote:<br>
</div>
<blockquote cite="mid:D000F598.31C9%25Jacob.Trevino@asrc.cuny.edu"
type="cite">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;
font-size: 14px;"> <span style="font-family: Calibri, 'Slate
Pro', sans-serif; font-size: medium; background-color:
rgb(255, 255, 255);">Hello All,</span></div>
<div style="color: rgb(0, 0, 0); font-family: Calibri, sans-serif;
font-size: 14px;"> <br>
</div>
<div><span style="background-color: rgb(255, 254, 254);"><font
face="Calibri,Slate Pro,sans-serif"><font color="#000000"
face="Calibri,sans-serif">We are so very close to having
our contractor hand over our new building and cleanroom,
however an issue has come up over cleanroom pressurization
during fire alarms. Currently in a fire alarm event, the
building </font>management<font color="#000000"
face="Calibri,sans-serif"> system ramps the cleanroom
supply air down, while maintaining hood exhaust rates,
thus bringing the room into negative pressure. We have
been told that this was done to comply with NYC Department
of Building code, which requires rooms to be negative
relative to</font></font></span><span style="font-size:
medium; font-family: Calibri, 'Slate Pro', sans-serif;
background-color: rgb(255, 255, 255);"> </span><span
style="font-size: initial; font-family: Calibri, 'Slate Pro',
sans-serif; line-height: initial; text-align: initial;">?corridor
pressurization (in the event of a fire).</span></div>
<div style="color: rgb(0, 0, 0);"><span style="background-color:
rgb(255, 254, 254);"><font face="Calibri,Slate Pro,sans-serif"><font
color="#000000" face="Calibri,sans-serif"><br>
</font></font></span></div>
<div style="color: rgb(0, 0, 0);">The cleanroom team argues the
negative pressure has two very negative implications. The first
and most important is that with hoods still pulling air at
normal rates, doors leading out of the cleanroom may become
suctioned shut and difficult to open in the event of fire.
Secondly, negative pressures are obviously bad for the
cleanliness of the cleanroom. </div>
<div style="color: rgb(0, 0, 0);"><br>
</div>
<div style="color: rgb(0, 0, 0);">We would like to throttle the
system down to maintain a very light positive pressure in the
event of a fire alarm, however we are still meeting a good deal
of resistance from building designers who have never worked with
a cleanroom before. </div>
<div style="color: rgb(0, 0, 0);"><br>
</div>
<div style="color: rgb(0, 0, 0);">I am very curious to learn what
your pressurization scheme might be in the event of a fire
alarm. Do you have any references you have found valuable
(people, organizations, documents)? Any input would be greatly
appreciated.</div>
<div style="color: rgb(0, 0, 0);"><br>
</div>
<div style="color: rgb(0, 0, 0);">Best,</div>
<div style="color: rgb(0, 0, 0);">Jacob</div>
<div style="color: rgb(0, 0, 0);"><br>
</div>
<div style="color: rgb(0, 0, 0);">
<div>
<div>----------------------------- </div>
<div>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt;
font-size: 11pt;"><b><i>Jacob Trevino, PhD</i></b><br>
NanoFabrication Facility Director<br>
The City University of New York (CUNY)<br>
Advanced Science Research Center (ASRC)<br>
Tel. (646) 664-8914<o:p></o:p></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt;
font-size: 11pt;">Fax. (646) 664-2965<o:p></o:p></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt;
font-size: 11pt;">Email: <a moz-do-not-send="true"
href="mailto:Jacob.Trevino@asrc.cuny.edu" style="color:
purple;">Jacob.Trevino@asrc.cuny.edu</a><o:p></o:p></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt;
font-size: 11pt;">Web: <a moz-do-not-send="true"
href="http://asrc.cuny.edu/" style="color: purple;">http://asrc.cuny.edu/</a><o:p></o:p></p>
<p class="MsoNormal" style="margin: 0in 0in 0.0001pt;
font-size: 11pt;"><o:p> </o:p></p>
</div>
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</div>
<div style="color: rgb(0, 0, 0);"><br>
</div>
<div style="color: rgb(0, 0, 0);"><br>
</div>
<div style="color: rgb(0, 0, 0);"><span style="background-color:
rgb(255, 254, 254);"><font color="#1f497d" face="Calibri,Slate
Pro,sans-serif"><font color="#000000"
face="Calibri,sans-serif"><br>
</font></font></span></div>
<br>
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