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<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>All,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>A colleague brought up an interesting point about filters and fan
BHp. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Regarding 90.1-2007, Table 6.5.3.1.1A, Option 2, what is your
interpretation of “bhp = the maximum combined fan brake horsepower”
for an AHU? And how does 90.1-2007 verify this?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>90.1-2007 defines “fan system bhp” and “fan
system design conditions”; however there isn’t any clear mention of
how exactly fan BHp is defined with respect to filters (100% loaded filter</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'> delta-</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>p, 66%
loaded filter</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'> delta-p</span><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>, 33% loaded filter</span><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:black'> delta-p</span><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:black'>, etc.).
The fan system would still meet capacity requirements, just at a reduced filter
pressure drop as scheduled.<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>For example, a designer could define (and schedule) the fan BHp to
operate at a max of 66% of allowable filter pressure drop for reduced fan energy,
yet schedule a fan motor to be able to meet the fully loaded filter pressure
drop. <o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>The ramifications of scheduling a lower fan BHp against 90.1-2007
is the proposed system will now be operating more “efficiently”,
compared to the baseline, assuming the filters are truly replaced at 66% of
allowable filter pressure drop (which likely would never happen in the field!).
<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Any thoughts on this? Anyone on the 90.1-2007 committee that
could shed some insight?<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Thanks,<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'>Ryan<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";
color:black'><o:p> </o:p></span></p>
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<p class=MsoNormal align=center style='text-align:center;mso-element:frame;
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paragraph;mso-element-anchor-horizontal:column;mso-height-rule:exactly'><span
style='color:black'><img width=47 height=62 id="Picture_x005f_x0020_10"
src="cid:image001.jpg@01CAC41D.BE9A7650"
alt="cid:image002.jpg@01CA226C.BD738F80"></span><span style='font-family:
"Arial","sans-serif";color:black'><o:p></o:p></span></p>
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<p class=MsoNormal style='line-height:11.0pt;mso-line-height-rule:exactly;
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mso-height-rule:exactly'><b><span style='font-size:14.0pt;color:navy;
letter-spacing:-.3pt'>R. Ryan Hammond </span></b><b><span
style='font-size:10.0pt;color:navy;letter-spacing:-.3pt'>PE, HBDP, BEMP, LEED</span></b><b><span
style='font-size:10.0pt;color:navy;letter-spacing:-.3pt'> </span></b><b><span
style='font-size:10.0pt;color:navy;letter-spacing:-.3pt'>AP</span></b><span
style='font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal style='line-height:11.0pt;mso-line-height-rule:exactly;
mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-wrap:around;
mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;
mso-height-rule:exactly'><b><span style='font-size:10.0pt;color:navy'>Engineer</span></b><span
style='font-size:12.0pt;font-family:"Times New Roman","serif";color:black'><o:p></o:p></span></p>
<p class=MsoNormal style='line-height:11.0pt;mso-line-height-rule:exactly;
mso-element:frame;mso-element-frame-hspace:2.25pt;mso-element-wrap:around;
mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;
mso-height-rule:exactly'><b><span style='font-size:9.0pt;color:gray'>(P)
916.921.1956 x202 </span></b><span style='font-family:"Arial","sans-serif";
color:black'><o:p></o:p></span></p>
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mso-height-rule:exactly'><b><span style='font-size:10.0pt;color:navy;
letter-spacing:.4pt'>GUTTMANN</span></b><span style='font-size:10.0pt;
color:#FF6600;letter-spacing:.4pt'> <b>& </b></span><b><span
style='font-size:10.0pt;color:navy;letter-spacing:.4pt'>BLAEVOET </span></b><span
style='font-size:10.0pt;color:#FF6600;letter-spacing:.2pt'>Consulting
Engineers</span><span style='font-family:"Arial","sans-serif";color:black'><o:p></o:p></span></p>
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mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;
mso-height-rule:exactly'><span style='font-size:9.0pt;color:navy'><a
href="http://gb-eng.com/page/Contact"><span style='color:navy;text-decoration:
none'>San Francisco | Sacramento | Santa Rosa</span></a> | <a
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style='font-size:9.0pt;color:navy'><o:p></o:p></span></p>
<p class=MsoNormal style='line-height:11.0pt;mso-line-height-rule:exactly'><b><i><span
style='font-size:9.0pt;color:green'>Certified <a
href="http://www.greenbiz.ca.gov/AboutUs.html"><span style='color:green;
text-decoration:none'>Green Business</span></a> committed to the <a
href="http://www.2030challenge.com/"><span style='color:green;text-decoration:
none'>2030 Challenge</span></a><o:p></o:p></span></i></b></p>
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mso-element-anchor-vertical:paragraph;mso-element-anchor-horizontal:column;
mso-height-rule:exactly'><b><span style='font-size:9.0pt;color:#FF6600;
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style='color:#FF6600;text-decoration:none'>HVAC, Plumbing, Fire Protection,
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<p class=MsoNormal style='line-height:11.0pt;mso-line-height-rule:exactly;
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