<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:x="urn:schemas-microsoft-com:office:excel" 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=utf-8"><meta name=Generator content="Microsoft Word 14 (filtered medium)"><!--[if !mso]><style>v\:* {behavior:url(#default#VML);}
o\:* {behavior:url(#default#VML);}
w\:* {behavior:url(#default#VML);}
.shape {behavior:url(#default#VML);}
</style><![endif]--><style><!--
/* Font Definitions */
@font-face
{font-family:Helvetica;
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:Helvetica;
panose-1:2 11 6 4 2 2 2 2 2 4;}
@font-face
{font-family:Calibri;
panose-1:2 15 5 2 2 2 4 3 2 4;}
@font-face
{font-family:Tahoma;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:Verdana;
panose-1:2 11 6 4 3 5 4 4 2 4;}
@font-face
{font-family:"Franklin Gothic Book";}
@font-face
{font-family:Garamond;
panose-1:2 2 4 4 3 3 1 1 8 3;}
@font-face
{font-family:Garamond-Italic;
panose-1:0 0 0 0 0 0 0 0 0 0;}
/* Style Definitions */
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri","sans-serif";}
a:link, span.MsoHyperlink
{mso-style-priority:99;
color:blue;
text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{mso-style-priority:99;
color:purple;
text-decoration:underline;}
p.MsoPlainText, li.MsoPlainText, div.MsoPlainText
{mso-style-priority:99;
mso-style-link:"Plain Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Franklin Gothic Book";
color:#1F497D;}
p.MsoAcetate, li.MsoAcetate, div.MsoAcetate
{mso-style-priority:99;
mso-style-link:"Balloon Text Char";
margin:0in;
margin-bottom:.0001pt;
font-size:8.0pt;
font-family:"Tahoma","sans-serif";}
span.PlainTextChar
{mso-style-name:"Plain Text Char";
mso-style-priority:99;
mso-style-link:"Plain Text";
font-family:"Franklin Gothic Book";
color:#1F497D;}
span.BalloonTextChar
{mso-style-name:"Balloon Text Char";
mso-style-priority:99;
mso-style-link:"Balloon Text";
font-family:"Tahoma","sans-serif";}
span.EmailStyle21
{mso-style-type:personal-reply;
font-family:"Calibri","sans-serif";
color:#1F497D;}
.MsoChpDefault
{mso-style-type:export-only;
font-size:10.0pt;}
@page WordSection1
{size:8.5in 11.0in;
margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{page:WordSection1;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext="edit" spidmax="1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext="edit">
<o:idmap v:ext="edit" data="1" />
</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='color:#1F497D'>Here is an abstract from 90.1 User’s Manual that answers your question:<o:p></o:p></span></p><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;font-family:"Garamond-Italic","serif"'>Pressure Drop Adjustment Devices<o:p></o:p></span></i></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>This section provides a description of the<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>types of devices that quality for additional<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>fan power. …<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'><o:p> </o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>………<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><i><span style='font-size:10.0pt;font-family:"Garamond-Italic","serif"'>Return and/or exhaust airflow control devices</span></i><span style='font-size:10.0pt;font-family:"Garamond","serif"'>.<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>Some types of spaces such as laboratories,<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>test rooms, or operating rooms require<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>that an airflow control device be provided<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>at both the supply air delivery point and at<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>the exhaust. The exhaust airflow control<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>device is typically modulated to maintain a<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>negative or positive space pressure relative<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>to surrounding spaces. An additional<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>pressure drop and associated brake<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>horsepower adjustment is permitted when<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>this type of device is installed. The credit<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Garamond","serif"'>may be taken when some spaces served by</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>an air handler have exhaust airflow devices<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>and other spaces do not. However, the<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>credit is taken only for the CFM of air that<o:p></o:p></span></p><p class=MsoNormal style='text-autospace:none'><span style='font-size:10.0pt;font-family:"Garamond","serif"'>is delivered to spaces with a qualifying<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Garamond","serif"'>exhaust air flow device.</span><span style='color:#1F497D'><o:p></o:p></span></p><div><p class=MsoNormal><span style='color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='color:#1F497D'>-- <o:p></o:p></span></p><p class=MsoNormal><b><span style='font-family:"Verdana","sans-serif";color:#666666'>Maria Karpman </span></b><span style='font-family:"Verdana","sans-serif";color:#666666'>LEED AP, BEMP, CEM</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana","sans-serif";color:#666666'>________________</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-family:"Verdana","sans-serif";color:#666666'>Karpman Consulting<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Verdana","sans-serif";color:#666666'><a href="http://www.karpmanconsulting.net/"><span style='color:blue'>www.karpmanconsulting.net</span></a> </span><span style='font-size:10.0pt;color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Verdana","sans-serif";color:#666666'>Phone </span><span style='font-size:7.5pt;font-family:"Helvetica","sans-serif";color:#666666;background:white'>860.430.1909 </span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#666666'>41C New London Turnpike</span><span style='color:#1F497D'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:7.5pt;font-family:"Arial","sans-serif";color:#666666'>Glastonbury, CT 06033</span><span style='color:#1F497D'><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 [mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Jones, Christopher<br><b>Sent:</b> Wednesday, July 29, 2015 6:06 PM<br><b>To:</b> bldg-sim@onebuilding.org<br><b>Subject:</b> [Bldg-sim] ASHRAE 90.1 fan power limitation calculation question<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><p class=MsoPlainText>For the baseline fan power limitation, the pressure drop allowances are defined. I am a bit fuzzy on the definition of "Return/Exhaust Control Devices". A system with a return fan and OA economizer typically has dampers to control the flow of the OA, return/exhaust air streams. Would these dampers qualify as a Return/Exhaust Control Device?<o:p></o:p></p><p class=MsoPlainText><o:p> </o:p></p><p class=MsoNormal><span style='color:#1F497D'><img border=0 width=108 height=43 id="Picture_x0020_2" src="cid:image001.png@01D0CA2E.A4FA5540" alt="cid:image003.png@01D09C46.E75BA0D0"></span><b><span style='color:#1C467A'><o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1C467A'>Christopher Jones,</span></b><b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'> </span></b><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>P.Eng.<i> <br></i></span><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Senior Engineer<b><o:p></o:p></b></span></p><p class=MsoNormal><b><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>WSP Canada Inc.<o:p></o:p></span></b></p><p class=MsoNormal><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>2300 Yonge Street, Suite 2300<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Toronto, ON M4P 1E4</span><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#595959'><br></span><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>T +1 416-644-4226<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>F +1 416-487-9766<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>C +1 416-697-0065<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><a href="http://www.wspgroup.com/">www.wspgroup.com</a> </span><i><span lang=EN-CA style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#565656'><o:p></o:p></span></i></p><p class=MsoPlainText><o:p> </o:p></p><div class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><hr size=2 width="100%" align=center></span></div><div><p class=MsoNormal><span style='font-size:9.0pt;font-family:"Arial","sans-serif";color:gray'><br>You are receiving this communication because you are listed as a current WSP contact. Should you have any questions regarding WSP’s electronic communications policy, please consult our Anti-Spam Commitment <a href="www.wspgroup.com/casl">www.wspgroup.com/casl</a>. For any concern or if you believe you should not be receiving this message, please forward this message to us at <a href="mailto:caslcompliance@wspgroup.com">caslcompliance@wspgroup.com</a> so that we can promptly address your request. This message is intended only for the use of the individual or entity to which it is addressed, and may contain information which is privileged, confidential, proprietary or exempt from disclosure under applicable law. If you are not the intended recipient or the person responsible for delivering the message to the intended recipient, you are strictly prohibited from disclosing, distributing, copying or in any way using this message. If you have received this communication in error, please notify the sender, and destroy and delete any copies you may have received. <br><br>WSP provides professional land surveying services through the following entities: WSP Surveys (AB) Limited Partnership and WSP Surveys (BC) Limited Partnership <o:p></o:p></span></p></div><div class=MsoNormal align=center style='text-align:center'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'><hr size=1 width="100%" noshade style='color:#A0A0A0' align=center></span></div><p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><span style='font-size:12.0pt;font-family:"Times New Roman","serif"'>No virus found in this message.<br>Checked by AVG - <a href="http://www.avg.com">www.avg.com</a><br>Version: 2014.0.4821 / Virus Database: 4365/10324 - Release Date: 07/28/15<o:p></o:p></span></p></div></body></html>