Description• Standard Material: Galvanized steel sheet with insulated damper cover. • Prevents flame and smoke advancing at air ducting system, during a local fire. • High resistance against corrosion. • Two hours resistance at 1000ºC. • Installed on wall partitions/penetration holes where ducting pass through. • Has four models: Standard Model (FD-143), Circular Model (FD-243), Servo-motorized Model (FD-343), Servo-motorized Circular Model (FD-443). • Manufactured with electrical driven spring return actuator including electrothermal fuse set at 72ºC ( /- 4 ºC), or manufactured with manual including mechanical thermal fuse set at 72ºC ( /- 4 ºC).
