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<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>OK , its Friday so I am allowed to ask for advice and
guidance.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Firstly I am using VisualDoe, I am modeling the energy
performance of a 200,000 sf building which has 60,000 sf of laboratories. The
labs all have fume hoods so the supply air is balanced to the exhaust air (100%
OA).. Now I have the following problem: a fan system is either on or off,
therefore the lab fans are on 24 hours a day. I would like to reduce the
exhaust flow during unoccupied periods to exhaust air from the fume hoods at
their minimum flow of 40%. Reducing the flow would also reduce the make up of
outside air to balance the flow and obviously reduce energy consumption.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'>Am I missing something here or does anyone have a magic
trick that will allow me to accomplish my goal. Simply said HELP<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=2 face=Arial><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Peter Simmonds Ph.D.</span></font><o:p></o:p></p>
<p class=MsoNormal><font size=3 face=Arial><span style='font-size:12.0pt;
font-family:Arial'>Associate</span></font><br>
<font size=1 color=gray face=Arial><span style='font-size:7.5pt;font-family:
Arial;color:gray'>IBE Consulting Engineers</span></font><o:p></o:p></p>
<p class=MsoNormal><st1:Street w:st="on"><st1:address w:st="on"><font size=1
color=gray face=Arial><span style='font-size:7.5pt;font-family:Arial;
color:gray'>14130 Riverside Drive Suite 201</span></font></st1:address></st1:Street><o:p></o:p></p>
<p class=MsoNormal><st1:City w:st="on"><st1:place w:st="on"><font size=1
color=gray face=Arial><span style='font-size:7.5pt;font-family:Arial;
color:gray'>Sherman</span></font></st1:place></st1:City><font size=1
color=gray face=Arial><span style='font-size:7.5pt;font-family:Arial;
color:gray'> Oaks, CA 91423<br>
p: (818) 377-8220<br>
f: (818) 377-8230<br>
m: (818) 219-1284<br>
<a href="BLOCKED::http://www.ibece.com/" title="http://www.ibece.com/"><font
color=gray face="Arial Black" title="http://www.ibece.com/"><span
style='font-family:"Arial Black";color:gray'>IDEAS FOR THE BUILT ENVIRONMENT</span></font></a><br>
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