On Fri, 02 Mar 2007 01:01:09 GMT, kjw wrote:


It is my understandng that the combo units aren't nearly as good as
smoke rises and CO sinks. Putting a smoke detector low won't do much
good, nor would a CO do much good high.

CO does not sink. CO has a molecular weight of 28, the same as
nitrogen which makes up the majority of our atmosphere.