APPLICATION :
'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.
CONSTRUCTION :
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 9800 C for period of 90 minutes, conform to UL - 555, thereby acting as effective barrier in closed position to the flame path between air duct and fire effected area.
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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 material.
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.
SEALING SYSTEM:
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.
SEALING EFFICIENCY :
The sealing efficiency of damper Is 98 % approximately on cross sectional area.
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