GEZE hold-open system FA GC 150
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Hold-open system FA GC 150
3.5.2 Number and installation of fire detectors
h
Distance between lower edge of the lintel and ceiling or false ceiling (where a larger concentration of
smoke is to be expected first in the event of a fire).
Lintel-mounted smoke switch
Ceiling-mounted detector
Usually there must be at least one ceiling-
mounted detector - i.e. one pair of detectors - fit-
ted in the rooms adjacent to the smoke opening
– and at least one lintel-mounted detector on
one side of the lintel over the active leaf above
the smoke opening.
If the following prerequi-
sites are met, other installations are sufficient
one lintel-mounted smoke switch
ú
if the distance h is smaller than 100 cm on both
sides of the door
and
ú
if the opening width of the swing door is smaller
than 300 cm
7
if appropriate
smoke-permea-
ble false ceiling
Fig. 3.5.2.1
one lintel-mounted smoke switch and
one ceiling-mounted detector on each side of
the door
ú
if the distance h is greater than 100 cm on at
least one side of the door
or
ú
if the opening width of the swing door is greater
than 300 cm
7
if appropriate
smoke-permea-
ble false ceiling
Fig. 3.5.2.2
Lintel-mounted smoke switch
ú
The lintel-mounted smoke switch is installed directly above the door, in the case of 2-leaf doors above the
active leaf.
ú
The lintel-mounted smoke switch is installed in such a way that a minimum distance of 1 cm is observed
between the upper edge of the smoke switch housing and the component above it.
ú
The lintel-mounted smoke switch is only suitable for wall installation, it must not be installed on the ceiling.
ú
If the lintel-mounted smoke switch is subject to disruption such as steam, dust, condensation or operation-
related smoke development, it can make sense to cover the smoke chamber of the lintel-mounted smoke
switch and to install an additional thermal detector as lintel-mounted smoke switch above the door using an
installation bracket instead
(not permissible on rescue routes).
Ceiling-mounted detector
ú
The ceiling-mounted detectors are installed on the ceiling above the door, the distance to the wall is be-
tween 50 cm and 250 cm. The distance to any installation is at least 50 cm.
ú
If the distance h on one side of the door is greater than 500 cm, the corresponding ceiling-mounted detec-
tor can be mounted on a projecting arm 50 cm in front of the wall and at least 350 cm above the lower edge
of the lintel.
ú
In special ceiling situations (e.g. sloped ceilings, false ceilings, galleries) the fire detectors must be installed
where a larger concentration of smoke is to be expected in the event of a fire. If in doubt, a fire protection
planner or expert should be consulted.
