NRWG Multi-Leaf Damper Models JK-180MB / JK-190
Technical
documentation
Function | Areas of application and requirements
Construction subject to change
No return possible
Version: 2016-08-02 | Document: 09/53 | Page 2
FUNCTION
A natural smoke and heat exhaust ventilator (NRWG) is an
important part of a smoke and heat exhaust ventilation sys-
tem (RWA). In case of fire, it is used to remove hot gases
from a building in order to protect people, material property
and the environment.
In case of fire, smoke and heat exhaust ventilation systems
are supposed to ensure a smoke-free layer near the floor by
removing a sufficient amount of the smoke gas from the
smoke section. Moreover, in the initial fire, their function is
to remove the hot smoke gases released by the fire.
The use of smoke and heat exhaust ventilation systems for
creating smoke-free areas under a stable smoke layer is a
recognised smoke removal practice. It keeps rescue routes
free from smoke, thus assisting the evacuation of people. At
the same time, this method can reduce the damage and fi-
nancial losses caused by the fire. Moreover, this smoke re-
moval method facilitates the fire department's work:
by improving visibility
by removing the heat from the roof area
and by delaying horizontal fire propagation.
This is why a smoke and heat exhaust ventilation system
(RWA) constitutes an important safety device that serves for
preventive fire protection and must therefore be subjected
to regular tests and maintenance. The NRWG described in
this brochure is used as an integral part of an RWA overall
system.
"EN 12101-2 Smoke and heat control systems, Part 2: Speci-
fication for natural smoke and exhaust ventilators" specifies
the requirements of an NRWG and regulates the test meth-
ods for natural smoke and exhaust ventilators in the roof
and façade areas.
Application range according to DIN 18232-2
"This standard applies to the measurement and installation
of natural smoke removal systems (NRA) for rooms with ver-
tical smoke removal via the roof by thermal buoyancy ac-
cording to DIN 18232-1 for single-storey buildings and the
top floor of multi-storey buildings. This standard also applies
to the measurement and installation of NRA for rooms with
horizontal smoke removal through exterior walls. This stand-
ard contains information and definitions that have to be ob-
served when applying these measurement rules and in-
stalling NRA."
Measurement basis according to 18232-2
"The measurement of natural smoke removal systems (NRA)
depends on the energy release rate, the calculated fire sur-
face area or measurement group and on the desired thick-
ness of the low-smoke layer and on the room height.
The calculated values given for determining the above-
mentioned influence variables are auxiliary variables for
measurement and serve exclusively for measurement as
specified in this standard.
AREAS OF APPLICATION AND
REQUIREMENTS
The multi-leaf dampers JK-180MB and JK-190 are suitable as
natural smoke and exhaust ventilator for installation in the
façade area (wall) and roof area
1)
(ceiling).
REQUIREMENTS
of NRWG systems according to EN 12101-2:
Trigger element
Trigger devices must be used that either must be connected
to a smoke detector according to EN 54-7 or heat detectors
according to EN 54-5 or a different electrical signal that re-
sponds to smoke or heat.
Furthermore, prEN 12101-9 and EN 12101-10 must be ob-
served.
Opening mechanism
Each NRWG is equipped with an opening mechanism - spring
return actuator or direct current actuator.
Opening of NRWG
According to EN 12101-2, the NRWG corresponds to type B
and can be opened to assume its functional position and
closed again by remote control.
Inputs and outputs
Inputs and outputs must be present in order to connect the
NRWG to the control panel according to EN 12101-9 and
power supplies according to EN 12101-10.
-------------
1)
Installation in a flat roof or slightly inclined roof (max. 10°)
with 500 mm flat-roof plinth and mounted louvre hood or
roof hood
