<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:large;color:#0000ff">Dear Chris,</div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:large;color:#0000ff">I have made the assumption that the pressure drop imposed by the silencers <u>on the fan system</u> is the value that should be counted.</div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:large;color:#0000ff"><br></div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:large;color:#0000ff">3 silencers on the supply side, for example, only affect the fan the same as one silencer (assuming they're in parallel). If, as you say, there is also one on the return side, then both will affect the fan and both should be counted.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Feb 28, 2017 at 8:09 AM, Chris Jones via Bldg-sim <span dir="ltr"><<a href="mailto:bldg-sim@lists.onebuilding.org" target="_blank">bldg-sim@lists.onebuilding.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="m_-8027644772265469232MsoPlainText">The 90.1-2007 fan pressure drop allowance includes credit for sound attenuation sections. Do you apply the credit for each silencer on a system? The system I am looking at has 3 silencers, one on the supply duct, one on each or two return
ducts entering the AHU.<u></u><u></u></p>
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<p class="MsoNormal"><b><span style="font-size:10.5pt;font-family:"Arial","sans-serif";color:#005eb8">Christopher Jones, </span></b><b><span style="font-size:9.0pt;font-family:"Arial","sans-serif";color:#005eb8">P.Eng.
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<br></blockquote></div><br><br clear="all"><div><br></div>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><div dir="ltr"><p><span style="font-size:10pt;font-family:Arial,sans-serif;color:black;background-image:initial;background-repeat:initial"></span></p>James V Dirkes II, PE, BEMP, LEED AP<br>CEO/President<br>The Building Performance Team Inc.<br>1631 Acacia Dr, GR, Mi 49504<br><br>Direct: 616.450.8653<br><a href="mailto:jim@buildingperformanceteam.com" target="_blank">jim@buildingperformanceteam.com</a><br><br><a href="http://buildingperformanceteam.com" target="_blank">Website </a>l <a href="https://www.linkedin.com/pub/jim-dirkes/7/444/413" target="_blank">LinkedIn</a> | <a href="http://buildingperformanceteam.com/bpt-insights-blog/item/73-modeled-performance-isn-t-actual-performance" target="_blank">May 2016 ASHRAE Journal article on energy modeling</a><p align="center" style="margin-bottom:0in;margin-bottom:.0001pt;text-align:center"><b><i><span style="font-size:14.0pt;line-height:115%;font-family:"MS Reference Sans Serif","sans-serif""> </span></i></b><span style="font-family:"MS Reference Sans Serif","sans-serif""></span></p><p style="vertical-align:middle">
</p><p style="margin-bottom:6.0pt;text-autospace:none"><span style="font-family:Calibri,sans-serif"><font size="4" color="#0000ff"></font></span></p><pre style="white-space:pre-wrap"><p style="margin-bottom:6.0pt;text-autospace:none"><span style="font-family:Calibri,sans-serif;font-size:10pt">Choice. It is perhaps the most distinct </span><span style="font-family:Calibri,sans-serif;font-size:10pt">and dignifying characteristic of humans. Consciously and with understanding, we </span><span style="font-family:Calibri,sans-serif;font-size:10pt">choose what is true, honorable, right, pure, lovely … or otherwise. Like the </span><span style="font-family:Calibri,sans-serif;font-size:10pt">rest of humanity, my choices don’t always align with true, honorable, right, pure, </span><span style="font-family:Calibri,sans-serif;font-size:10pt">and lovely, but I know those are what I set my sights upon. I choose them.</span></p></pre></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div>
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