<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><meta http-equiv=Content-Type content="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><style><!--
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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='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I vote “Ignore it”. It’s a small construction difference in a small portion of the overall envelope and will not affect your overall results at all, especially considering the myriad of other assumption you are making.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal align=center style='text-align:center'><b><span style='font-size:13.5pt;font-family:"Calibri","sans-serif";color:#1F497D'>The Building Performance Team<br></span></b><b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>James V. Dirkes II, P.E., BEMP , LEED AP<br></span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>1631 Acacia Drive NW<br>Grand Rapids, MI 49504<br>616 450 8653<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p><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>Rob Hudson<br><b>Sent:</b> Wednesday, November 09, 2011 9:45 AM<br><b>To:</b> bldg-sim@lists.onebuilding.org<br><b>Subject:</b> [Bldg-sim] Modeling an Exterior Chase<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Is it good modeling practice to model a small chase in a building if it is on the exterior? Should I simply add it to the space nearby or create its own space and let it float and push the loads via heat transfer to the interior spaces? Does adding this little bit of detail make enough difference? See my attachment for a little view as to what I am talking about.<o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Any help would be appreciated!<br clear=all><o:p></o:p></p><div><p class=MsoNormal><o:p> </o:p></p></div><p class=MsoNormal>-- <br>Rob Hudson<o:p></o:p></p></div></div></body></html>