12
ANYWHERE ALONG 
THIS BOLD SURFACE
Locations permitted for smoke
alarms and smoke detectors
on tray-shaped ceilings.
Not within 6 feet of appliances
ACCEPTABLE
TOP OF ALARM
ACCEPTABLE HERE 
Note: measurements shown 
are to the closest edge 
of the alarm.
ANYWHERE ALONG 
THIS BOLD SURFACE
Locations permitted for smoke
alarms and smoke detectors
on tray-shaped ceilings.
Not within 6 feet of appliances
ACCEPTABLE
TOP OF ALARM
ACCEPTABLE HERE 
Note: measurements shown 
are to the closest edge 
of the alarm.
ANYWHERE ALONG 
THIS BOLD SURFACE
Locations permitted for smoke
alarms and smoke detectors
on tray-shaped ceilings.
Not within 6 feet of appliances
ACCEPTABLE
TOP OF ALARM
ACCEPTABLE HERE 
Note: measurements shown 
are to the closest edge 
of the alarm.
ANYWHERE ALONG 
THIS BOLD SURFACE
Locations permitted for smoke
alarms and smoke detectors
on tray-shaped ceilings.
Not within 6 feet of appliances
ACCEPTABLE
TOP OF ALARM
ACCEPTABLE HERE 
Note: measurements shown 
are to the closest edge 
of the alarm.
NFPA 72 states: “Smoke alarms in rooms with ceiling slopes greater than 1 ft in 8 ft (.3m in 2.4 m) horizontally 
shall be located on the high side of the room.” NFPA 72 states: “A row of detectors shall be spaced and located 
within 3 ft (0.9m) of the peak of the ceiling measured horizontally.”
Figure 7-B Figure 7-C