Smoke and carbon monoxide (CO) detectors are best installed on every level of a home, inside each bedroom, and outside sleeping areas, typically on ceilings or high on walls (4-12 inches from the ceiling) because smoke rises and CO mixes with air, placing them near living areas and fuel-burning appliances but away from kitchens/bathrooms to avoid false alarms. Interconnected units provide maximum safety, with CO alarms near garages and boilers too.
Smoke Alarms Installation Location
Location: On ceilings or high on walls (4-12 inches from ceiling) in central locations, inside and outside sleeping areas, on every home level (including basement).
Why: Smoke rises, so high placement catches it first.
Carbon Monoxide (CO) Alarms Installation Location
Location: On every level, inside bedrooms, outside sleeping areas, near attached garages, and near fuel-burning appliances like furnaces/boilers.
Placement Details: On walls, 6 inches below the ceiling to 6 inches above the floor, or on the ceiling at least 6 inches from the wall.
Why: CO mixes evenly with air, so placement needs to cover all living/sleeping areas and potential sources.
Where NOT to Install (for both/CO)
Avoid: Kitchens (steam/fumes), bathrooms (humidity), near fans/vents, in dusty workshops, direct sunlight, or within 3 feet of windows/doors.
Keep Away: At least 10 feet from fuel-burning appliances.
Best Practices
Interconnect: Connect all alarms so when one sounds, they all do.
Combination Units: Use smoke/CO combination alarms for efficiency.
