BSK
Fire-resisting dampers
Use
A fire safety damper prevents the spread
of smoke and fire via ventilation and air
conditioning system ducts in the event
of fire.
Such units are installed in air ducts
located in fire-separation walls and ceil
ings. The fire resistance rating according to
EN 1366-2 is EIS 60 or EIS 120.
Design
The
BSK
series dampers are made in the generalpurpose industrial ver
sion with a minimized variety of hardware components using low-alloy
galvanized steel. The flap is made of fire-resistant material (vermiculite)
with thermoexpansive fireproof sealing.
The duct design implies two connection ports for integration into a ven
tilation duct (duct system).
Control and modifications
Depending on the design variant the
BSK
series dampers are equipped
with:
MECHANICAL ACTUATING UNIT WITH A THERMAL FUSE AND
A RETURN SPRING
The fire safety damper remains open in the protective position. The
damper is set to the operating position upon the thermal fuse break
down resulting from a temperature increase. In the event of fire, the
fusible element will melt upon the temperature reaching 72 °C and the
spring will set the flap to the closed position.
ELECTRIC ACTUATOR WITH A BUILT-IN RETURN SPRING AND
A THERMALLY SENSITIVE BREAKER
Setting the damper to operating position (direct fire contact):
remotely, via electric actuator. The damper can be set to the operat
ing or protective position either remotely via a control panel or man
ually using the manual cocking handle which is always included
in the standard delivery set of the electric actuator. In case of the
remote control panel failure, the backup thermal breaker interrupts
the power supply to the electric actuator and the return spring sets
the damper to the operating position. Emergency damper actuation:
The damper flap is set to the protective position automatically (damper
unaffected by fire). The electric actuator remains energized at all times.
In case of an emergency actuation (direct fire contact): The electric actu
ator equipped with a return spring is de-energized and the damper flap
is set to the operating position by means of the spring energy. In case
of a power failure not related to fire and its subsequent restoration at
the actuator with a return spring, the damper flap returns to a protec
tive position.
Mounting
During the fire safety damper installation make sure that the release
mechanism and the inspection hole face an easily accessible side of the
wall or ceiling. This will ensure convenient control of the thermally sen
sitive release mechanism and its internals.
The damper can be embedded into brick or concrete walls with the
appropriate fire resistance rating.
Wooden spreader bars should be used to avoid casing deformation
during the installation.
Upon completing the installation remove the wooden spreader bars.
The damper may not be installed:
•
Into air ducts and on premises rated explosion and fire safety cate
gory A and B.
•
Into air ducts of local intakes for flammable and explosive mixtures.
•
Into systems which are do not undergo periodic cleaning pursuant
to the established regulations for prevention of flammable deposit
buildup.
Use of wooden spreader bars
during installation
Recommended damper
positions
Normally open fire-resisting
duct damper with a thermal fuse
and a return spring
Normally open fire-resisting duct damper
with an electric actuator, a return spring
and a thermoelectric breaker
blaubergventilatoren.de
38
2020
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FIRE SAFETY
FIRE
SAFE
TY
D
AMPERS
