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<p class=MsoNormal style='margin-left:120.0pt;text-indent:-120.0pt;tab-stops:
120.0pt;mso-layout-grid-align:none;text-autospace:none'><b><span
style='mso-bidi-font-family:Calibri;color:black'>From:<span style='mso-tab-count:
1'>                                         </span></span></b><span
style='mso-bidi-font-family:Calibri;color:black'>Ed Cline
[ECline@filtersense.com]<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:120.0pt;text-indent:-120.0pt;tab-stops:
120.0pt;mso-layout-grid-align:none;text-autospace:none'><b><span
style='mso-bidi-font-family:Calibri;color:black'>Sent:<span style='mso-tab-count:
1'>                                           </span></span></b><span
style='mso-bidi-font-family:Calibri;color:black'>Wednesday, March 27, 2013 9:21
AM<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:120.0pt;text-indent:-120.0pt;tab-stops:
120.0pt;mso-layout-grid-align:none;text-autospace:none'><b><span
style='mso-bidi-font-family:Calibri;color:black'>To:<span style='mso-tab-count:
1'>                                               </span></span></b><span
style='mso-bidi-font-family:Calibri;color:black'>Topham, Nathan<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:120.0pt;text-indent:-120.0pt;tab-stops:
120.0pt;mso-layout-grid-align:none;text-autospace:none'><b><span
style='mso-bidi-font-family:Calibri;color:black'>Subject:<span
style='mso-tab-count:1'>                                     </span></span></b><span
style='mso-bidi-font-family:Calibri;color:black'>buiding pressure monitoring
for lead NESHAP<o:p></o:p></span></p>

<p class=MsoNormal style='margin-left:120.0pt;text-indent:-120.0pt;tab-stops:
120.0pt;mso-layout-grid-align:none;text-autospace:none'><b><span
style='mso-bidi-font-family:Calibri;color:black'>Attachments:<span
style='mso-tab-count:1'>                          </span></span></b><span
style='mso-bidi-font-family:Calibri;color:black'>DigiPort.pdf;
INS_SOAP_INSTALL03A.pdf; Paroscientific digiport paper.pdf<o:p></o:p></span></p>

<p class=MsoNormal><o:p> </o:p></p>

<p class=MsoNormal>Nate,</p>

<p class=MsoNormal><o:p> </o:p></p>

<p class=MsoNormal>Per our conversation this morning, FilterSense is contracted
to supply a differential pressure monitoring solution for a secondary lead
smelting facility to meet the NESHAP regulation for total enclosure monitoring.</p>

<p class=MsoNormal><o:p> </o:p></p>

<p class=MsoNormal>The rule requires enclosed areas to monitored with a DP
transmitter which has a range of 0.005 to 0.11 “wc and minimum accuracy of
0.0005”wc and the building be maintained at 0.007”wc negative pressure minimum.
We have a good source for the transmitter that meets these accuracy
requirements, Ashcroft IXLdp series.  Ashcroft has cautioned that there
can be large errors in a measurement this small due to wind effects and
pressure envelope created by the building at the outdoor measuring point. 
We have investigated this potential problem further and contacted the following
companies for assistance/expertise.  These companies have also indicated
that outdoor wind can produce errors in this type of measurement that are much
larger than the required measurement accuracy.</p>

<p class=MsoNormal><o:p> </o:p></p>

<p class=MsoNormal>Paroscientific Inc, Redmond, WA –They manufacture a device
called DigiPort that provides measurement accuracy better than +/- 0.08hPa
(0.032“wc) in strong winds.  This is much worse than the NESHAP accuracy
requirements.  See attached technical note p.2 that discusses the
dynamic/impact pressure caused by wind and DigiPort datasheet. </p>

<p class=MsoNormal><o:p> </o:p></p>

<p class=MsoNormal>Air Monitor Corporation, Santa Rosa, CA –They manufacture a
device called S.O.A.P.  They do not publish an accuracy specification vs.
wind velocity, however say it is used widely for building monitoring in nuclear
and other industries that typically have to maintain buildings at 0.02”wc
negative pressure.  See attached Static Outside Air Probe Installation
Procedure p.2 that describes the magnitude of pressure envelopes around a
building at various wind velocities.   </p>

<p class=MsoNormal><o:p> </o:p></p>

<p class=MsoNormal>The solution we are providing to the client will sound an
alarm if the differential pressure drops below 0.007”wc at any of the
measurement points.  We see a case where the measurement at the leeward
wall could easily drop below 0.007”wc due to wind effect and the building
envelope (not the loss of adequate building ventilation) and trigger a false
alarm.   We request further information or clarification from EPA on
how to make this measurement properly while maintaining the accuracy stated in
the NESAP.</p>

<p class=MsoNormal><o:p> </o:p></p>

<p class=MsoNormal>Thank You for your assistance.</p>

<p class=MsoNormal><o:p> </o:p></p>

<p class=MsoNormal>Ed Cline</p>

<p class=MsoNormal>VP Engineering </p>

<p class=MsoNormal>FilterSense</p>

<p class=MsoNormal>978-927-4304</p>

<p class=MsoNormal><a href="http://www.filtersense.com">www.filtersense.com</a></p>

<p class=MsoNormal><o:p> </o:p></p>

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