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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Dear eQuest Experts –<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'>I am working on a model for a laboratory building where the laboratory exhaust exceeds 5,000 cfm (combined, not for a single space). <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'>ASHRAE 90.1-2007, Section G3.1.1, exception d, states that <i>“for laboratory spaces with a minimum of 5,000 cfm exhaust, use system type 5 or 7 that reduce the exhaust and makeup air volume to 50% of design values, during unoccupied periods.” </i>This is a requirement for the Baseline case. <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'>I am using system type 5 but am not too sure how to model this requirement for flow rates. Does anyone have an insight to this or know of any specific instructions for meeting this requirement?<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'>As always, thank you for being such a helpful and knowledgeable group.<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'>Regards,<o:p></o:p></span></p><div><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#006E78'>Jeff Ross-Bain, PE, </span></b><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#006E78'>L</span><span style='font-size:8.0pt;font-family:"Century Gothic","sans-serif";color:#006E78'>EED AP BD+C, BEMP</span><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#535053'><br>Principal<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#535053'>404-220-8940 Office<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#535053'>404-220-8955 Direct<o:p></o:p></span></p><p class=MsoNormal style='margin-bottom:12.0pt'><b><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#006E78'><a href="http://www.rbgb.com/"><span style='color:blue'>www.rbgb.com</span></a></span></b><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#535053'><br><br></span><span style='font-size:7.5pt;font-family:"Century Gothic","sans-serif";color:#006E78'>Build Green. Save Time<b><o:p></o:p></b></span></p></div></div></body></html>