> CO is a denser-than-air gas, so stays near the floor while the Protect is mounted on the ceiling to detect smoke Research on this topic seems to indicate tha

> CO is a denser-than-air gas, so stays near the floor while the Protect is mounted on the ceiling to detect smoke Research on this topic seems to indicate that CO dissipates pretty evenly: "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." http://www.ncbi.nlm.nih.gov/pubmed/21536403 http://www.ncbi.nlm.nih.gov/pubmed/21536403