TSC'FIre Dampers are provided on air/ gas ducts to control
flow under normal circumstances and to isolate areas
connected by duct from the fire affected area.
Dampers are manufactured with single flap/ multilouvers.
The louvers are connected through suitable linkage to
a controlling actuating device, such as electrical actuator
/ solenoid valve / pneumatic cylinder / fusible link.
Louver / flap shaft are provided with bearings with
greasing facility to enable smooth rotation.
Louvers / flaps are made of mild steel. The louvers
/flaps are designed in the form of a box and are sandwiched
with 'high grade Insulating material which can withstand
98e C for period of 90 minutes, conform to UL - 565,
thereby acting as effective barrier In closed position
to the flame path between air duct and fire effected
The shape of the louver / flap Is somewhat complex in
nature for multifold purposes :
a) The complex shape reduces the leakage factor considerably.
b) Fire exposed surfaces are backed-up by Insulating
C) Due to special Insulating material, the strength
of the louver / flap is retained at high
temperature, thereby reducing the
possibility of leakages.
d) The shape provided, enables thermal expansion of
the louver / flap
without affecting sealing areas.
POSITIVE SEALING LINKAGE:
Linkage provided with spring return device for positive
shut-off pressure on each louver flap, enabling reduction
In leakage factor.
Z sections are provided at mating surfaces are designed
to create a heavy pressure drop during leakage, because
the air gas has to take two sharp right angle turns.
This gives a low leakage factor during damper~ operation.
The sealing efficiency of damper Is 98 % approximately
on cross sectional area.