Volume Control Dampers are manufacturing with single flap / multi louvers. The louvers are connected through suitable linkage to a controlling actuating devices, such as electrical actuator / pneumatic actuator / solenoid valve / pneumatic cylinder / fusible link. Louvers / flap shaft are provided with bearing with greasing facility to enable smooth rotation. Louvers / flap are made of mild steel / galvanized sheet. The louvers / flap are designed in the form, which can withstand high temperature control in closed position to the flame path between air duct and fire effected area.

The shape of the louvers / flap in somewhat complex in nature for multi fold purpose.

The complex shape reduces the leakage factor considerably.
Five exposed surfaces are backed up
Positive sealing linkage
Linkage provided with spring return devices for positive setup pressure on each louvers / flap, enabling reduction in leakage factor.

Sealing System: Complex shape are provided at mating surfaces are designed to create a heavy pressure drop during leakage because the air/gas has to take two sharp angles turns. This gives a low leakage factor during damper operation.

Sealing efficiency: The ceiling of damper is 97% on cross sectional area.

Closing Reliability: BKA Fire Dampers are designed to close automatically immediately (depends on the mode of actuation) on receiving of the signal of fire occurrence.

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