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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><b><span style='color:#0070C0'>Hello colleagues <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'>I have a an air leakage question, <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'>The problem is when the exterior soffit vents and fascia panels are open to interior ceiling spaces, can be to a plenum ceiling or non-plenum ceiling, <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'>these openings at the soffit and fascia are allowing air infiltration above ceiling tile, <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'>Does anybody know what method/formula to use to calculate these air infiltration energy losses, and how they load the HVAC units ?<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'>Any reference/articles ?<o:p></o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'>Thank you <o:p></o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='color:#0070C0'>P.S I don’t use any software, I would like to do it in excel </span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#0070C0'><o:p></o:p></span></p><p class=MsoNormal><b><span style='color:#0070C0'><o:p> </o:p></span></b></p><p class=MsoNormal><b><o:p> </o:p></b></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div></body></html>