Carbon monoxide

Is carbon monoxide lighter or heavier than air?
Of course, any time you have gas appliances or a wood-burning fireplace, you should have at least one carbon monoxide (CO) detector in the home.
CO is odorless, tasteless and DOES NOT GIVE WARNING that it is being produced or building up.
And, is it lighter or heavier than air? Which means, does it rise or fall when produced?
Since the molecular weights of gases differ, what makes them move is convection. If a gas is released because of combustion, it would tend to rise due to its heat.
CARBON MONOXIDE HAS NEARLY THE DENSITY OF AIR. CO is slightly lighter. So how does CO compare with air? It is 3% lighter. So it distributes very easily through a house.
But when CO is produced, it immediately begins mixing, and therefore diluting, with the air around it. It is very diluted. And as CO is produced, it is warmer than the air around it.
So what is the most advantageous place to put a CO detector? CO moves with the air, so where the air is flowing it will go also. It is very unpredictable where the air, and therefore CO, will move at any given time. That is why the instructions with the unit you buy do not say to place it high or low on the wall.
Understanding all that, the National Fire Protection Association (NFPA) suggests in 720, 2-1.1.2* 1998 -
"A carbon monoxide alarm or detector should be centrally located outside of each separated sleeping area in the immediate vicinity of the bedrooms. Where bedrooms are separated and the audibility of the alarm or detector to occupants within the bedroom area could be seriously impaired, more than one unit could be needed. Each alarm or detector should be located on the wall, ceiling, or other location as specified in the installation instructions that accompany the unit."
Which detector should you buy?
The suggestion is one that is plugged in and preferably with a battery back up. These detectors use electrochemical technology to detect CO gas. Like smoke detectors, they are effective for 10 years.
My recommendation: buy a good plug-in detector with a battery back up. Put it near any potential CO source and another near your bedroom(s).

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