CO detector go off for real danger or false alarm. Real: bad furnaces, blocked chimneys, cars in garages, indoor generators. False: dead battery or expired device
Where to Install Your CO Detectors
Proper placement is just as important as having a detector in the first place. The National Fire Protection Association (NFPA) recommends:
Placement tips:
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Mount on the wall about 5 feet above the floor or on the ceiling
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Keep at least 10–15 feet away from fuel-burning appliances to avoid nuisance alarms from normal startup emissions
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Avoid bathrooms, direct sunlight, and areas near fans or vents
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