Do not place the detector right next to or over a fireplace or flame producing appliance.
Carbon monoxide detector distance from furnace.
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.
The detector may be placed on the ceiling.
How far should a carbon monoxide detector be placed from a furnace or boiler.
How far should carbon monoxide detector be from furnace.
Keep units at least 20 feet 6 meters away from common sources of combustion particles.
Homes with attached garages.
Detector within 10 feet of the internal door to your garage.
In small homes where 20 foot distance is not possible place the alarm as far away from fuel burning sources as possible.
Feet apart or less then place one in the middle.
Keep the area ventilated to prevent unwanted alarms.
Make sure you don t install any co detector too close to any appliance that generates heat.
Avoid kitchens garages and furnace rooms.
Keep at least 12 feet 3 7 m distance from the furnace or boiler if otherwise not specified in the user manual.
The main thing that you are trying to avoid here is false alarms.
You will need more than one detector.