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Old 11-14-2014, 10:28 AM   #51
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Originally Posted by keith_h View Post
That is not correct. LP is heavier than air which is why the detector is near the floor. The The specific gravity of Carbon Monoxide is 0.9657. With air having a specific gravity of 1.0 this means CO will float. As to where to place the detector the general recommendation is up high but below the ceiling to allow for hot air at the top that can keep CO from rising all of the way up. I placed ours on the side of the cabinet that is over our bed and is about 10" from the ceiling.
Since CO is somewhat lighter than air you would want the detector lower than your sleeping area. You want the alarm to activate prior to breathing the products of combustion (CO).
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Old 11-14-2014, 10:42 AM   #52
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Since CO is somewhat lighter than air you would want the detector lower than your sleeping area. You want the alarm to activate prior to breathing the products of combustion (CO).
The general recommendations from the manufacturers and safety organizations are to mount the detectors around eye level and at least a foot or two from the ceiling. Many safety organizations/fire departments do not recommend using plugin types, unless they have a chord to allow higher mounting, as that would place the detector too low when plugged into a typical wall socket. In the case of our trailer where I have mounted the detector is roughly eye level.
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Old 11-14-2014, 11:09 AM   #53
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Fyi

Where to Place a Carbon Monoxide Detector

Manufacturers are not specific concerning where to locate a carbon monoxide detector. If you read the installation instructions from a variety of CO detector models you'll become confused and wonder if there is such a thing as a "good location".

There is a reason for the ambiguity. There is no "best" location. It depends on the type of detector, how it is powered and the layout of the building it is supposed to protect.

Old-school theory dictates that the detector should be placed high on the wall, above the height where room thermostats are normally located. That puts it roughly at 6 or 7 feet above the floor.

The theory says that since CO is slightly lighter than air, it will gradually rise and make its way toward the ceiling. The chemical charts show that carbon monoxide (CO) is 3% lighter than air at standard conditions.

However, over time manufacturers realized that CO disburses in air and generally would follow air currents based on the temperature of the air. If the air cools down, CO would also cool and then hover closer to the floor. So, many of the manufacturers deemed it permissible to locate CO detectors closer to the floor and plug them into standard power outlets that are 12 to 24 inches above the floor.
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Old 11-14-2014, 11:00 PM   #54
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Originally Posted by keith_h View Post
That is not correct. LP is heavier than air which is why the detector is near the floor. The The specific gravity of Carbon Monoxide is 0.9657. With air having a specific gravity of 1.0 this means CO will float. As to where to place the detector the general recommendation is up high but below the ceiling to allow for hot air at the top that can keep CO from rising all of the way up. I placed ours on the side of the cabinet that is over our bed and is about 10" from the ceiling.

I stand corrected. Guess I was recalling propane not CO.


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Old 11-15-2014, 06:14 AM   #55
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To further muddy the discussion of CO movement, remember that the two sources of CO inside an RV are the cooktop and furnace (if the heat exchanger is cracked). The CO from these will be hot, so although the specific gravity of it is very close to that of air, it will tend to rise with the rest of the products of combustion (mostly CO2, water vapor and heated air) until all those hot gases mix with the rest of the air in the RV. So it won't really go just to level dictated by its specific gravity.

Propane, on the other hand, isn't heated, so you'd expect it to seek low levels.

Also, remember that the primary value of a propane detector is that odor doesn't wake up humans. You can detect a propane leak long before the concentration is a problem when you are awake, but not when you are asleep.
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Old 11-16-2014, 07:12 PM   #56
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I missed this thread when it was started over the summer. We had a night of continuing false alarms out of the Saf-T-Alert combo LP/CO detector in our July 2010 build '11 Sunseeker 2300 one night this past August, while plugged in with no CO sources anywhere nearby, and no wiffs of LP either. After 3 squawks in an hour between 1am and 2am, venting the unit via open door and bathroom fan each time, it got pulled out of the cabinet and the wiring disconnected. The "expiration date" on it was the prior month.

The replacement, in round numbers with shipping almost $100 (!), went off our next big trip one night in early October, but that was while dry camping with the generator running so it may have been warranted, but in our 4th season of this RV a CO condition inside has never been an issue previously, at least with the original detector.

I'll be staying tuned to what else is posted here.
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Old 11-16-2014, 08:47 PM   #57
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Why do they always go off at 2:00 am?
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