<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Thanks for your thoughts John. I am wondering how useful the measurement of CO2 in homes is. I have a CO meter and pull it out on occasion and to my memory have not found anything with it in a home. Typically with a couple of people or small family in a single family dwelling, I wonder whether they alone could ever get the levels up to something dangerous? Now blended families or extended families all living under one roof, I think that may be possible. <div><br></div><div>I'm not disagreeing with you at all, what you are saying is what I talk about too, but again, is it actually valid? I don't know, and hence the head scratching. </div><div><br></div><div>Grateful for your time thinking about this.</div><div><br></div><div>Stephen</div><div><br><div>
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"><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; text-transform: none; orphans: 2; white-space: normal; widows: 2; word-spacing: 0px; "><div style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; "><span class="Apple-style-span" style="border-collapse: separate; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; color: rgb(0, 0, 0); font-family: Helvetica; font-size: 12px; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; -webkit-text-decorations-in-effect: none; text-indent: 0px; -webkit-text-size-adjust: auto; 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"><span class="Apple-style-span" style="font-size: 10px; "><span class="Apple-style-span" style="font-size: 10px; "><span class="Apple-style-span" style="font-size: 10px; ">Indoor Environmental Testing & Building Consulting</span></span></span></span></font></span></div><div><a href="http://www.yourhealthyhouse.ca">http://www.yourhealthyhouse.ca</a></div><div><a href="mailto:stephen@yourhealthyhouse.ca">stephen@yourhealthyhouse.ca</a></div><div>705.652.5159</div><div><span class="Apple-style-span" style="font-size: medium;"><br></span></div></span></span></div></span></div></span></div></span></div></span></div></span></span></div><div><br class="webkit-block-placeholder"></div><div><blockquote type="cite"><o:smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region">
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<div class="Section1"><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Hi,<o:p></o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">There are a lot of adjectives for air –
stale, stagnant, dead, fetid…<o:p></o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Air basically means for us oxygen as a
requirement – so stale air could simply be oxygen poor air.<o:p></o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">.<o:p></o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">With ashrae I guess there is adequate
ventilation and inadequate ventilation and stale would be an excess of
unventilated air (stale??). Ashrae uses co2 concentrations as the indicator for
adequate ventilation so there definition is ppm for various uses.<o:p></o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">In emergency first aid I measure
ventilation rates, blood oxygen levels as well of level of consciousness –
all of which could reveal an emergency condition in students in a classroom at
the end of a day subject to averaged ventilation and subsequent ‘stale’
air. Tidal volume (breath) is about 500ml with about 14% oxygen and 4.4% co2
exhaled – outside air is about 21% oxygen and .04% co2. <o:p></o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">So a significant amount of c02 is released
on each breath in comparison to the intake – so we could say that ‘stale
air’ is any air exhaled.<o:p></o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">Fun question.<o:p></o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy">John<o:p></o:p></span></font></p><p class="MsoNormal"><font size="2" color="navy" face="Arial"><span style="font-size:
10.0pt;font-family:Arial;color:navy"><o:p> </o:p></span></font></p><p class="MsoNormal"><font class="Apple-style-span" color="#000080" face="Arial" size="3"><span class="Apple-style-span" style="font-size: 13px;"><br></span></font></p><div><div><span style="orphans: 2;text-align:auto;widows: 2;-webkit-border-horizontal-spacing: 0px;
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