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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>I was wondering if anyone would be willing to share thermally broken aluminum frame conductance values that they’ve been using in recent Windows5 center-of-glass calculations. I don’t have information on the particular aluminum frames for my current project, so I don’t really want to try and learn THERM quite yet.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Most of the older documentation online that I’ve found shows that thermally broken aluminum frames typically have a U-value of about 1.0. This jives with one of DOE-2s window entries for a PPG glass with a frame conductance of 0.94.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Almost every commercial building constructed these days is made with aluminum framed windows…I just have a hard time believing that manufacturers haven’t figured out better ways to insulate the frames. With vinyl and wood having U-values < 0.4, I have to think that aluminum frames should be able to at least approach 0.5, if not lower. Unfortunately not a lot of manufacturers of aluminum frames post their thermal characteristics.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>What are people using?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Thanks in advance!<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></b><b><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></b><b><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. Glebe Rd, Suite 200</span></ns0:address></ns0:Street></span><o:p></o:p></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif"'><ns0:place><ns0:City><span style='color:black'>Arlington</span></ns0:City><span style='color:black'>, </span><ns0:State><span style='color:black'>VA</span></ns0:State><span style='color:black'> </span><ns0:PostalCode><span style='color:black'>22201-4749</span></ns0:PostalCode></ns0:place></span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-338-5754 (Cell)</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-243-1200 (Office)</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:black'>703-276-1376 (Fax)</span><span style='color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Arial","sans-serif";color:teal'><a href="http://www.ghtltd.com/"><span style='font-size:10.0pt;color:blue'>www.ghtltd.com</span></a><o:p></o:p></span></p><p class=MsoNormal><b><span style='color:#31849B'><o:p> </o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p></div></body></html>