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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'>Paul,<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The standard is using a reduced notation format (not one I generally use or encourage others to use). More fully described it should be (bold is my update):<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>“the region within an occupied space between planes <b>located</b> 3 <b>in</b> and 72 in. (75 <b>mm</b> and 1800 mm) above the floor and more than 2 ft (600 mm) from the walls or fixed air-conditioning equipment.”<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Basically, draw one plane relative to each surface of the room. If the surface is a floor, draw the breathing zone “floor” plane at 0’-3” AFF. If it is a ceiling, draw the plane relative to the floor at 6’-0” AFF. If it is a wall, draw the plane 2’-0” perpendicular from the wall. The volume enclosed by the intersection of all of those planes is the breathing zone.<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Hope that helps with the definition!<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The problem I usually run into is this definition to begin with. It conflicts with the definition for “zone” (renamed to “ventilation zone” by an addendum), which includes the entire volume of a space or multiple spaces. The calculations for breathing zone outdoor airflow use “Az = zone floor area: the net occupiable floor area of the zone ft2 (m2).” So for calculation purposes – I don’t see any use for the definition of breathing zone. The formulas are based on total floor area, not the area of the lower plane of the breathing zone (0’-3” AFF) and also do not make consideration for space volume vs. breathing zone volume. This is all while calculating Vbz for the breathing zone.<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Since it usually results in more OA than other methods, I typically ignore the breathing zone definition for calculation of Az.<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><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>Any thoughts from the rest of the list?<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><div><p class=MsoNormal><b><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#1F497D'>Jeremy R. Poling, PE, LEED AP+BDC</span></b><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><br><br></span><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p></div><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"'> equest-users-bounces@lists.onebuilding.org [mailto:equest-users-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Paul Diglio<br><b>Sent:</b> Thursday, April 21, 2011 10:16 AM<br><b>To:</b> equest-users@lists.onebuilding.org<br><b>Subject:</b> [Equest-users] LEED Increased Ventilation ASHRAE 62.1<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><div><p class=MsoNormal><span style='font-size:10.0pt;color:black'>Per the LEED NC V3 requirements in order to qualify for IEQc2 the ventilation in the breathing zone needs to be increased by 30%.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:black'>62.1-2007 defines the breathing zone as "the region within an occupied space between planes 3 and 72" above the floor and more than 2' from the walls or fixed air-conditioning equipment."<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:black'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:10.0pt;color:black'>I do not understand what is meant by "planes 3". <br><br>Can anyone shed some light on this? Has anyone has success modeling a reduced space volume in eQuest or is it easier to perform a manual calculation and adjust the CFM of outside air per a weighted volume? <br><br>Thank you,<br><br>Paul Diglio<o:p></o:p></span></p></div></div></div></body></html>