Because carbon monoxide is slightly lighter than air and also because it may be found with warm rising air detectors should be placed on a wall about 5 feet above the floor.
Carbon monoxide detector distance from furnace.
Feet apart or less then place one in the middle.
Detector within 10 feet of the internal door to your garage.
If you have an enclosed garage directly attached t o the home then you should also place a.
The detector may be placed on the ceiling.
In short you should place your carbon monoxide detector at least 15 feet away from your furnace and this same rule applies to all other combustion appliances.
Do not place the detector right next to or over a fireplace or flame producing appliance.
How far should carbon monoxide detector be from furnace.
You will need more than one detector.
Keep the area ventilated to prevent unwanted alarms.
Keep at least 12 feet 3 7 m distance from the furnace or boiler if otherwise not specified in the user manual.
Keep units at least 20 feet 6 meters away from common sources of combustion particles.
In small homes where 20 foot distance is not possible place the alarm as far away from fuel burning sources as possible.
How far should a carbon monoxide detector be placed from a furnace or boiler.
Homes with attached garages.
According to this advice plugging the unit into a typical outlet near the floor creates very little safeguard against carbon monoxide poisoning in your home.
If however they are more than 30 feet apart.
The main thing that you are trying to avoid here is false alarms.