Anywhere.: They may be placed anywhere. The density of CO is so close to that of air that it does not layer. See http://www.ncbi.nlm.nih.gov/pubmed/21536403 J Emerg Med. 2012 Apr;42(4):478-82. doi: 10.1016/j.jemermed.2011.03.015. Epub 2011 May 4.
Answered 2/13/2015
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