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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>James---<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'>This was discussed recently in the posts. See the attached response from last Tuesday. <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'>Mike Rosenberg commented that this is being addressed in the upcoming 90.1-2010 as such:<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='text-autospace:none'><b><span style='font-size:12.0pt;font-family:"TimesNewRoman\,Bold"'>G3.1.2.10.1 </span></b><span style='font-size:12.0pt;font-family:TimesNewRomanPSMT'>The calculated system fan power shall be<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:12.0pt;font-family:TimesNewRomanPSMT'>distributed to supply, return, exhaust, and relief fans in the<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:TimesNewRomanPSMT'>same proportion as the proposed design.</span><span style='font-size:12.0pt'><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><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#DB824A'>Andrew Craig </span></b><b><span style='font-size:6.0pt;font-family:"Arial","sans-serif";color:#DB824A'>PE, LEED AP<br></span></b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#4D4D4D'>Project Mechanical Engineer<br></span><span style='font-size:2.0pt;font-family:"Arial","sans-serif";color:#4D4D4D'><br></span><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#DB824A'>INTERFACE ENGINEERING<br>email </span></b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#4D4D4D'><a href="mailto:andrewc@interfaceeng.com"><span style='color:#4D4D4D;text-decoration:none'>andrewc@interfaceeng.com</span></a><br></span><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#DB824A'>direct </span></b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#4D4D4D'>503.382.2696<br></span><span style='font-size:2.0pt;font-family:"Arial","sans-serif";color:#4D4D4D'><br></span><b><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#DB824A'><a href="http://www.interfaceeng.com/"><span style='color:#DB824A'>www.interfaceeng.com</span></a><br></span></b><span style='font-size:2.0pt;font-family:"Arial","sans-serif";color:#4D4D4D'><br><br><o:p></o:p></span></p></div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> bldg-sim-bounces@lists.onebuilding.org [mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>James Hansen<br><b>Sent:</b> Tuesday, March 15, 2011 12:05 PM<br><b>To:</b> bldg-sim@lists.onebuilding.org<br><b>Subject:</b> [Bldg-sim] pro-rating fan power to supply/return fans per 90.1-2007?<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>App G says that if the proposed building has return fans, the baseline building is to be modeled with them as well, sized either at the minimum required to ensure ventilation, or 90% of the supply volume, whichever is greater. And the fan power calculations show that the KW allowance is for all supply, return, exhaust and relief fans combined. <o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>How do you generally pro-rate the fan power between supply and return fans in the baseline model? Ultimately it probably doesn’t make too much difference, but is there an actual ruling that tells you how to do this?<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><o:p> </o:p></p><p class=MsoNormal><b><span style='font-family:"Arial","sans-serif";color:teal'>GHT Limited<br></span></b><b><span style='font-family:"Arial","sans-serif"'><ns0:PersonName><span style='color:black'>James Hansen</span></ns0:PersonName></span><span style='color:black'>, PE, LEED AP<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>Senior Associate</span><span style='color:black'><o:p></o:p></span></b></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:Street><ns0:address><span style='color:black'>1010 N. 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