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<p class="MsoNormal"><span style="color:#1F497D">Hello Steve;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">To tag onto Ari’s response only because it was a semi-vague question.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If this is a general type question: ASHRAE 62.1-2010 Section 5.3 calls for Ventilation ‘whenever occupied’. Tagging onto this ASHRAE 90.1-2010 Section 6.4.3.4.2 states that all outside air and exhaust damper
shut when systems or spaces served are not in use. (paraphrasing). Different reasons, but effective ventilation when the space is occupied used, and minimize energy the spaces aren’t used. Keeps occupants healthy with OA and minimizes energy consumption.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">If this is a modeling / appendix G type question, the Ari nailed it.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial Black",sans-serif;color:black;text-transform:uppercase">DARIC R. ADAIR</span><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#1F497D">
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</span><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:black">Licensed in KS.</span><span style="font-size:7.5pt;font-family:"Arial",sans-serif;color:#1F497D"> </span><span style="color:#1F497D"><o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Greenberg, Ari [mailto:AGreenberg@brplusa.com] <br>
<b>Sent:</b> Thursday, August 13, 2015 2:45 PM<br>
<b>To:</b> 'Steve Jacobs' <sjacobseng@gmail.com>; equest-users@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Equest-users] Fan cycling when unoccupied<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#44546A">Hi Steve,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#44546A">I believe the requirement comes from Appendix G: “<b>G3.1.2.4 Fan System Operation.
</b>Supply and return fans shall operate continuously whenever spaces are occupied and shall be cycled to meet heating and cooling loads during unoccupied hours.”<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#44546A"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#44546A">Hope that helps.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#44546A">Ari<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#44546A"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#0F286F">Ari Greenberg<br>
HVAC Engineer</span></b><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#484848">
<o:p></o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Equest-users [<a href="mailto:equest-users-bounces@lists.onebuilding.org">mailto:equest-users-bounces@lists.onebuilding.org</a>]
<b>On Behalf Of </b>Steve Jacobs<br>
<b>Sent:</b> Thursday, August 13, 2015 3:30 PM<br>
<b>To:</b> <a href="mailto:equest-users@lists.onebuilding.org">equest-users@lists.onebuilding.org</a><br>
<b>Subject:</b> [Equest-users] Fan cycling when unoccupied<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Does anyone know if the requirement for the OA to remain off when the fans cycle after hours comes from somewhere in ASHRAE, or is just something that LEED requires.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thanks,<o:p></o:p></p>
<p class="MsoNormal">Steve<o:p></o:p></p>
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