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Message: <blockquote data-quote="guywhofishes" data-source="post: 76569" data-attributes="member: 337"><a href="http://www.ncbi.nlm.nih.gov/pubmed/21536403#" target="_blank">J Emerg Med.</a> 2012 Apr;42(4):478-82. doi: 10.1016/j.jemermed.2011.03.015. Epub  2011 May 4.[h=1]Should the placement of carbon monoxide (CO) detectors be influenced by CO's weight relative to air?[/h]<a href="http://www.ncbi.nlm.nih.gov/pubmed/?term=Hampson%20NB%5BAuthor%5D&cauthor=true&cauthor_uid=21536403" target="_blank">Hampson NB</a>[SUP]1[/SUP], <a href="http://www.ncbi.nlm.nih.gov/pubmed/?term=Courtney%20TG%5BAuthor%5D&cauthor=true&cauthor_uid=21536403" target="_blank">Courtney TG</a>, <a href="http://www.ncbi.nlm.nih.gov/pubmed/?term=Holm%20JR%5BAuthor%5D&cauthor=true&cauthor_uid=21536403" target="_blank">Holm JR</a>.[h=3]<a href="http://www.ncbi.nlm.nih.gov/pubmed/21536403#" target="_blank">Author information</a>[/h][h=3]Abstract[/h][h=4]BACKGROUND:[/h]Numerous  states and localities have recently passed legislation mandating the  installation and use of residential carbon monoxide (CO)  detectors/alarms. Interestingly, there seems to be confusion about the  optimal placement, if any, of CO alarms inside the home.[h=4]OBJECTIVES:[/h]It  was the goal of this study to demonstrate the behavior of CO in air and  to help provide a data-based recommendation for CO alarm placement.[h=4]METHODS:[/h]CO  was calculated to be slightly lighter than air. An 8-foot-tall airtight  Plexiglas chamber was constructed and CO monitors placed within at the  top, middle, and bottom. CO test gas (15 L, 3000 parts per million) was  infused at each of the three heights in different trials and CO levels  measured over time.[h=4]RESULTS:[/h]Contrary  to a significant amount of public opinion, CO did not layer on the  floor, float at the middle of the chamber, or rise to the top. In each  case, the levels of CO equalized throughout the test chamber. It took  longer to equalize when CO was infused at the top of the chamber than  the bottom, but levels always became identical with time.[h=4]CONCLUSIONS:[/h]As  would have been predicted by the Second Law of Thermodynamics, CO  infused anywhere within the chamber diffused until it was of equal  concentration throughout. Mixing would be even faster in the home  environment, with drafts due to motion or temperature. It would be  reasonable to place a residential CO alarm at any height within the  room.</blockquote>

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