5
c) Smoke alarm device placement in large corridors
d) Smoke alarm device placement in corridors with corner areas
6. Structural features
• If the height of a room is separated by a platform or gallery, a smoke alarm device must be
installed below these features if their area exceeds 16 m
2
and their length and width each
exceed 2 m.
• In rooms with a ceiling slope of > 20° with respect to the horizontal, heat pockets can form
under the top of the ceiling, which prevent smoke reaching the smoke alarm device.
• Therefore, smoke alarm devices must be installed at least 0.5 m and at most 1 m from the top
of the ceiling in these room, see figure below.
• In rooms with a ceiling slope of ≤ 20°, smoke alarm devices must be installed in the middle
of the ceiling.
Installation example for a slanted roof with an angle of > 20°
Note: Smoke alarm devices can be placed either in the left position (1) or right position (2).
7. Notes for installation at the ceiling
For ceiling with bearer – (height (h) of the bearer ≤ 0.20 m and with a ceiling area of > 36 m
2
and ≤ 36 m
2
, respectively)
a) Example for a ceiling > 36 m
2
Key:
1 = smoke alarm device
Key:
1 = ceiling area
2 = bearer
b) Example for ceiling area ≤ 36 m
2
c) Example for ceiling with bearer (height (h) of the bearer > 0.20 m)
In corridors with a max. width of 3 m, the distance between two smoke alarm devices must
not be more than 15 m. The distance of the smoke alarm device to the short side of the cor-
ridor must not be more than 7.5 m. In areas of crossings, junctions and corners (mitre line) of
corridors, one smoke alarm device must be installed each. A placement example is shown in
section 4.
8. Installation
• Loosen the mounting plate at the back of the device by turning it counter-clockwise
• Fasten the mounting plate on the ceiling or wall using the enclosed mounting material. Before
doing so, ensure that the enclosed mounting material is suitable for the structural character-
istics of the ceiling or wall.
• Place the smoke alarm device into the mounting plate and turn it counter-clockwise until you
can hear it click into place.
• Caution: Smoke alarm devices with replaceable battery can only be fastened when the bat-
tery is inserted, because they have a locking mechanism.
The battery pin (red) set to OFF before the device is used (photo on the left). When the device
is switched on, the battery pin moves (photo on the right).
Make a test after installation
Key:
1 = ceiling area
2 = bearer
Ceiling
Ceiling
Ceiling
Ceiling
Ceiling
OFF
ON
OFF
ON
Red battery pin - OFF
Battery pin after installation
