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Hi folks,<br><br>
I disagree with Mr. Dirkes' comment in this case. From the IAQ
perspective, CO2 level is also a measure stick for indoor air quality. If
you focus only on CO2 level, you are missing all sort of other possible
gases indoor pollutants (VOCs, BFRs and what not) which are not monitored
normally. High CO2 level = high indoor pollutants level unless you have
zero emission materials indoors (that means all building materials,
furnishing and furnitures), which is probably not possible in this case.
By increasing CO2 level by limit ventilation, you are then starting a
path heading having sick building syndrome (SBS) for the future
occupants. <br><br>
Saying we should not ventilate in order to save energy, because CO2 isn't
really a human carcinogen is really missing the issue of how indoor air
quality works.<br><br>
James Lo<br>
The University of Texas at Austin<br>
Department of Civil, Architectural and Environmental Engineering
<br><br>
At 07:29 AM 2/16/2010, Bonafe, Wes wrote:<br>
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All:<br>
<br>
Thanks to Mr. Dirkes.<br>
<br>
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.<br>
<br>
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.<br>
<br>
Thanks:<br>
<br>
Wes<br>
<br>
<b>From:</b> bldg-sim-bounces@lists.onebuilding.org
[<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" eudora="autourl">
mailto:bldg-sim-bounces@lists.onebuilding.org</a>] <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<br>
<br>
Dear Amit,<br>
<br>
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”.<br>
<br>
Health does not start to be affected until CO2 exceeds 5000 ppm. (per US
EPA and ACGIH)<br>
<br>
<div align="center"><b>The Building Performance Team<br>
James V. Dirkes II, P.E., LEED AP<br>
</b>1631 Acacia Drive NW<br>
Grand Rapids, MI 49504<br>
616 450 8653<br>
</div>
<br>
<b>From:</b> bldg-sim-bounces@lists.onebuilding.org
[<a href="mailto:bldg-sim-bounces@lists.onebuilding.org" eudora="autourl">
mailto:bldg-sim-bounces@lists.onebuilding.org</a>] <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<br>
<br>
Hi all,<br>
This question is not directly related to the group but i wanted to
throw it in as many of you might know the answer.<br>
<br>
What is the acceptable CO2 level for a healthcare facility? Can i find
the number in any ASHRAE standards?<br><br>
-- <br>
Thanks<br><br>
Sincerely,<br>
Amit Bhansali, M.S. , EIT<br>
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