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.
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.
Wall mounted alarms should be installed not more than 12 inches away from the ceiling to the top of the alarm.
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.
Mount smoke alarms high on walls or ceilings remember smoke rises.
Confusing but the answer is simple.
Place a smoke detector about 12 inches from the ceiling on the wall.
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.
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.
Mount smoke alarms high on walls or ceilings remember smoke rises.
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.
Clarification is required in nfpa 72 on how to apply smoke detection spacing requirements for these high ceiling applications.
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.
Every new dwelling shall be provided with smoke detectors.
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.
Do not place the detector right next to or over a fireplace or flame producing appliance.