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From: "Ron Laughlin" <ronlaughlin@hotmail.com>
To: lancair.list@olsusa.com
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Subject: Re: Garage heater
Date: Thu, 27 Dec 2001 09:49:02 -0600
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          <<  Lancair Builders' Mail List  >>
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>>
Hi Tony,

You better dust off those books. <BG> CO2 is heavier than CO because of the 
extra oxygen molecule.  CO, with only 2 molecules, is a relatively light gas 
with an atomic weight in the neighborhood of O2 or N2. It mixes so well with 
our atmosphere that location of the sensor is fairly non-critical. I think 
the manufacturers recommend mounting on the wall about 18 inches below 
ceiling level due to the fact that there is sometimes less air movement and 
mixing up at ceiling level in a typical room. We are talking here about 
differences in detection time of seconds, not minutes or hours. If the 
detector is anywhere in the room with you, you will have plenty of warning, 
particularly if there is a heater in the room causing air currents to rise 
to and mix everything up. This applies to an aircraft cabin as well.

Ron Laughlin



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