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Old 12-06-2009, 04:13 PM   #16
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Smoke/Carbon Monixide Placement Code

Indications in the diagrams indicate location within 12" of the ceiling
As I recall my instructions indicated these exact details/locations

DOE link that seems to indicate that the CO will mix with Air & since they are close to the same density it is not critical

But they do say:

Although the molecular weights of these gases differ, convection and not density differences dominate the distribution of CO, methane etc. The release of gases associated with combustion tend to rise because they are hotter than ambient. For this reason smoke detectors and CO detectors are usually placed high on the walls of hallways etc


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Old 12-06-2009, 05:30 PM   #17
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Smoke/Carbon Monixide Placement Code

To answer the OP's question: Most local codes incorporate NFPA 72, the "National Fire Alarm and Signaling Code."


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