If you have ceilings that are pitched install the alarm within 3 feet of the peak but not within the apex of the peak four inches down from the peak.
Hight requireme mount smoke detector from ceiling on wall.
Ceiling mounted smoke detectors should be mounted at least 6 inches away from where the ceiling meets the wall.
Every new dwelling shall be provided with smoke detectors.
The detector shall be mounted on the ceiling or wall at a point centrally located in the corridor or area giving access to rooms used for sleeping purposes and in every sleeping room.
The table below also shows heights which detectors are permitted to be mounted at if 10 or less of the ceiling is the height shown.
This gives enough room for any gasses while also making sure that the smoke detector detects the rising smoke and as an added bonus you can see the smoke detector red light in case there is something wrong like the battery is low.
There is inconsistency in design and code enforcement for spacing requirements of smoke detectors when installed in areas with high ceilings where high ceilings are defined as over 10 feet in height.
Wall mounted alarms should be installed not more than 12 inches away from the ceiling to the top of the alarm.
The detector may be placed on the ceiling.
Below is a series of recommended mounting heights for fire alarm system equipment including different types of smoke detector including optical beam detectors and heat detectors.
Mount smoke alarms high on walls or ceilings remember smoke rises.
If you have ceilings that are pitched install the alarm within 3 feet of the peak but not within the apex of the peak four inches down from the peak.
Mount the smoke detector on a wall at least 6 inches away from the ceiling but not more than 12 inches away keeping the detector away from the dead zone but high enough to detect the smoke since smoke rises.
Confusing but the answer is simple.
Mount smoke alarms high on walls or ceilings remember smoke rises.
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.
Place a smoke detector about 12 inches from the ceiling on the wall.