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<div class=Section1>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Dear Wes,<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'>I think you are asking “How do I tell a non-technical
client / customer that CO2 is not worth worrying about.”<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'>First, it’s pretty hard to argue against popular opinion
and the mainstream media’s general inclination to promote gloom and
doom. After all, if ABC or MSNBC or the local newspaper or (fill in the
blank) says it, it MUST be true.<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'>My approach is something like:<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Do my homework and become confident that I have a reasonable
understanding of the basis for whatever position I take.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Be open to the (normal) reality that not everything is known
about almost any topic.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Stand up for the truth and discourage worry or fear when it’s
not warranted.<o:p></o:p></span></p>
<p class=MsoListParagraph style='text-indent:-.25in;mso-list:l0 level1 lfo1'><![if !supportLists]><span
style='font-size:11.0pt;font-family:Symbol;color:#1F497D'><span
style='mso-list:Ignore'>·<span style='font:7.0pt "Times New Roman"'>
</span></span></span><![endif]><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
color:#1F497D'>Present the best available information in a manner that helps
non-technical people understand it. In the case of CO2 or any indoor
contaminant, it would be something like “The premier experts in the field
of indoor air quality have condensed the requirements for acceptable indoor air
quality into a single standard that is recognized throughout the world and
updated regularly. That standard is called ASHRAE Standard 62.1. At
Moseley Architects, we follow that Standard as well as other related standards
and are confident that it represents the most current and comprehensive way to
assure your health in an indoor environment. Any questions?”<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'>That still may not carry the day for certain of your clients,
but what the heck! Science is supposed to be a rational topic and you
cannot argue an irrational objection; don’t try!<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'>p.s., Since this is a building simulation forum, I should
probably stop here. Feel free to call or e-mail directly at <a
href="mailto:jim@buildingperformanceteam.com">jim@buildingperformanceteam.com</a>.
<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 align=center style='text-align:center'><b><span
style='font-size:13.5pt;color:#1F497D'>The Building Performance Team<br>
</span></b><b><span style='color:#1F497D'>James V. Dirkes II, P.E., LEED AP<br>
</span></b><span style='color:#1F497D'>1631 Acacia Drive NW<br>
Grand Rapids, MI 49504<br>
616 450 8653<o:p></o:p></span></p>
</div>
<p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";
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 style='margin-left:.5in'><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-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Bonafe, Wes<br>
<b>Sent:</b> Tuesday, February 16, 2010 10:53 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Acceptable CO2 levels<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Me again:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>To me Mr. Dirkes’ seems
well informed on the issue of CO<sub>2</sub> concentration. Our concern
has been the public’s perception that one becomes sleepy, or drowsy when
exposed to PPM levels of CO<sub>2</sub> in excess of 1000 PPM. As they
say perception is reality and I can rarely come out on top of a discussion
involving a concerned parent with “my opinion”. Therefore the
need for a study or printed information to reinforce “my
opinion”. We would considers a reference to the OSHA TLV, coupled
with the 2000 PPM levels reached in a submarine. Has the U.S. Navy
printed anything? Can I backup my opinion that high CO<sub>2</sub> alone
is a non-issue. Mr. Dirkes’ comment was limited to CO<sub>2</sub>
and did not address all the other contaminants that can build up in a
space. There are products purported to eliminate these however they
cannot eliminate CO<sub>2</sub>. This requires that CO<sub>2</sub> be
allowed to increase in concentration above 1000 PPM within the space.
This, by the way, is easy (relatively cheap) to measure. It appears there
is no direct evidence “other than OSHA’s 5000 PPM TLV” that
up to 5000 PPM CO2 causes no harm. True?<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>As a disclaimer I have not
read ASHRAE Standard 62.1.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Thanks for your assistance:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Wes<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal style='margin-left:.5in'><b><span style='font-size:10.0pt;
font-family:"Arial","sans-serif";color:#1F497D'>Wes Bonafe, P.E.</span></b><span
style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><br>
Chief Mechanical/Plumbing Engineer<br>
Vice President<br>
LEED Accredited Professional<br>
<br>
<b>MOSELEY ARCHITECTS</b> <br>
Architecture. Engineering. Interiors. Planning<br>
3200 Norfolk Street<br>
Richmond, VA 23230<br>
804.794.7555<br>
FAX 804.355.5690<br>
<a href="http://www.moseleyarchitects.com">www.moseleyarchitects.com</a><br>
<a href="http://www.moseleyprojects.com">www.moseleyprojects.com</a></span><span
style='color:#1F497D'><o:p></o:p></span></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:7.5pt;
font-family:"Verdana","sans-serif";color:green'><br>
Please consider the environment before printing this e-mail.</span><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";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 style='margin-left:.5in'><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-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>James V
Dirkes II, PE<br>
<b>Sent:</b> Tuesday, February 16, 2010 9:18 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Acceptable CO2 levels<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:.5in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Dear Bldg-Sim community,<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>A few more comments for your
consideration:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>ASHRAE
Standard 62.1 is the principal reference used for acceptable indoor air
quality. It hasn’t been mentioned in this discussion, so I want to
make sure you consult it. It’s Appendix A says, <o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>“</span><span
style='font-size:10.0pt;font-family:"Sylfaen","serif"'>CO</span><span
style='font-size:8.0pt;font-family:"Sylfaen","serif"'>2 </span><span
style='font-size:10.0pt;font-family:"Sylfaen","serif"'>is a bioeffluent
generated by people at a rate determined by their size, age, fitness, and
activity level. At the same time people are generating CO</span><span
style='font-size:8.0pt;font-family:"Sylfaen","serif"'>2</span><span
style='font-size:10.0pt;font-family:"Sylfaen","serif"'>, they are also
producing odorous bioeffluents. These odorous bioeffluents are generated
proportionally to the rate of CO</span><span style='font-size:8.0pt;font-family:
"Sylfaen","serif"'>2 </span><span style='font-size:10.0pt;font-family:"Sylfaen","serif"'>production,
although diet and personal hygiene also play a role. Nevertheless, CO</span><span
style='font-size:8.0pt;font-family:"Sylfaen","serif"'>2 </span><span
style='font-size:10.0pt;font-family:"Sylfaen","serif"'>concentration is a
fairly dependable indicator of the concentration of the odorous bioeffluents
that the occupant component of the breathing zone ventilation rate attempts to
control. Hence, we can use CO</span><span style='font-size:8.0pt;font-family:
"Sylfaen","serif"'>2 </span><span style='font-size:10.0pt;font-family:"Sylfaen","serif"'>concentration
to dynamically adjust the occupant component of the ventilation rate to
reduce outdoor air intake rates when zones are not occupied at their design
occupancy.”<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>The
key concept misunderstood in most discussions about CO2 is that maintaining a
specific level of CO2 in an occupied space is done NOT because the CO2 is
unhealthful, but because it’s a convenient indicator of occupant comfort.
Comfort in this case is measured by “odorous bioeffluents”,
otherwise known as “body odor”.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>While
you <u>can</u> have harmful health effects from high levels of CO2, those
levels are (essentially) never encountered in a building. The only
“real” situation I am aware of where CO2 concentrations exceed
2000ppm (which is less than 50% of OSHA’s TLV) is in a submarine; not too
much fresh air available there!<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I’ve
paid very close attention to information about CO2 over the last 20 years or so
because for many of those years, I worked for a manufacturer of
direct-fired heating equipment. That type of heating is commonly used in
industrial occupancies due to its exceptional efficiency (92%) and a few other
factors. One perceived downside of that equipment was that all of the
combustion products, including CO2, are released into the occupied space,
causing CO2 levels to rise, on occasion, to 2000ppm.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>I
also sat for several years on the ANSI Technical Advisory Group which wrote the
current national standards for that equipment. The member group of a
couple dozen code officials, testing agency and manufacturing representatives
conducted an extensive review of literature and found no evidence either in the
literature or their collective experience that CO2 was a concern under 5000ppm.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>In
summary, my personal and fairly informed opinion is that the CO2 level in
buildings is not even close to a health issue. Follow ASHRAE Standard
62.1 and all will be well. A recent post on this list referenced an
article at buildingscience.com by Joe Lstiburek which (I think rightly) points
out the huge energy implications of introducing more air than indicated by Std
62.1; that’s a bigger issue, I think.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:.5in;text-autospace:none'><span
style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'>p.s.,
I could not find any literature in my archives regarding a correlation between
CO2 and drowsiness. I don’t think there’s any literature
indicating a strong correlation, certainly not at normal building concentrations.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<div>
<p class=MsoNormal align=center style='margin-left:.5in;text-align:center'><b><span
style='font-size:13.5pt;color:#1F497D'>The Building Performance Team<br>
</span><span style='color:#1F497D'>James V. Dirkes II, P.E., LEED AP<br>
</span></b><span style='color:#1F497D'>1631 Acacia Drive NW<br>
Grand Rapids, MI 49504<br>
616 450 8653<o:p></o:p></span></p>
</div>
<p class=MsoNormal style='margin-left:.5in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";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 style='margin-left:1.0in'><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-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>Bonafe, Wes<br>
<b>Sent:</b> Tuesday, February 16, 2010 8:29 AM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Acceptable CO2 levels<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>All:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Thanks to Mr. Dirkes.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Can anyone direct us to a
study that says high CO<sub>2</sub> in and of itself does not cause health
issues especially drowsiness? We have asked for such a study from those
providing filtration prior to considering such filtration on our projects.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>I think CO<sub>2</sub> is
definitely related to energy use/modeling because you can reduce levels of
outside air if allowing higher CO<sub>2</sub> levels.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Thanks:<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Wes<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";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 style='margin-left:1.0in'><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-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>James V
Dirkes II, PE<br>
<b>Sent:</b> Monday, February 15, 2010 4:39 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> Re: [Bldg-sim] Acceptable CO2 levels<o:p></o:p></span></p>
</div>
</div>
<p class=MsoNormal style='margin-left:1.0in'><o:p> </o:p></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Dear Amit,<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Keep in mind that
ASHRAE’s “acceptable” level of CO2 has almost nothing to do
with health. You could describe it as more of a “body odor”
or “pleasantness” index. When the ambient levels of CO2
exceed their recommendation (~1000 ppm), people start to feel that the indoor
air is less pleasant or “stuffy”.<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'>Health does not start to be
affected until CO2 exceeds 5000 ppm. (per US EPA and ACGIH)<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<p class=MsoNormal align=center style='margin-left:1.0in;text-align:center'><b><span
style='font-size:13.5pt;color:#1F497D'>The Building Performance Team<br>
</span><span style='color:#1F497D'>James V. Dirkes II, P.E., LEED AP<br>
</span></b><span style='color:#1F497D'>1631 Acacia Drive NW<br>
Grand Rapids, MI 49504<br>
616 450 8653<o:p></o:p></span></p>
<p class=MsoNormal style='margin-left:1.0in'><span style='font-size:11.0pt;
font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p>
<div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>
<p class=MsoNormal style='margin-left:1.5in'><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-bounces@lists.onebuilding.org
[mailto:bldg-sim-bounces@lists.onebuilding.org] <b>On Behalf Of </b>amit
bhansali<br>
<b>Sent:</b> Monday, February 15, 2010 4:24 PM<br>
<b>To:</b> bldg-sim@lists.onebuilding.org<br>
<b>Subject:</b> [Bldg-sim] Acceptable CO2 levels<o:p></o:p></span></p>
</div>
<p class=MsoNormal style='margin-left:1.5in'><o:p> </o:p></p>
<div>
<p class=MsoNormal style='margin-left:1.5in'>Hi all,<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.5in'>This question is not directly
related to the group but i wanted to throw it in as many of you might
know the answer.<o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.5in'> <o:p></o:p></p>
</div>
<div>
<p class=MsoNormal style='margin-left:1.5in'>What is the acceptable CO2 level
for a healthcare facility? Can i find the number in any ASHRAE standards?<br
clear=all>
<br>
-- <br>
Thanks<br>
<br>
Sincerely,<br>
Amit Bhansali, M.S. , EIT<o:p></o:p></p>
</div>
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