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FDR-3G…OF
Overflow Fire Damper FDR-3G
Description
Overflow fire dampers up to size 630 mm represent passive fire protection, designed with the help of
compartmentalization to prevent the spread of toxic gases, smoke and fire. Standard fire dampers are designed and
certified in accordance with EN 15650 and tested for EIS criteria according to EN 1366–2. Fire damper together with its
installation form an inseparable part of fire resistivity rating. FDR-3G...OF fire dampers are designed for the installations
listed and described in their User Manual. By default, all fire dampers are supplied with an manual mechanism or
actuator mechanism, optionally with smoke detector. FDR-3G...OF is equipped on both ends with Grilles that together
with the duct extensions cover blade overhangs.
Manually Operated Fire Dampers
By default, all manually operated fire dampers are supplied with hand crank, optionally with micro switches. In case of
fire, the fire damper is closes automatically after the melting of the thermal fuse. After the closing of the damper
blade, it is mechanically locked in the closed position and can only be opened manually. The actuating mechanism is
activated when the temperature of the air in the duct reaches 74°C and the damper closes within 10 seconds after the
melting of the fuse.
Actuator- Operated Fire Dampers
By default, all actuator operated fire dampers are supplied with an actuator with micro switches. A fire damper
equipped with a spring return actuator can be closed with command from the building management system, or after
the breaching of the thermoelectric fuse. Actuator operated fire dampers are standardly equipped with a
thermoelectric fuse, that activates the closing of the damper after the reaching or exceeding of the ambient
temperature of 72°C. The actuator power circuit is interrupted and its spring closes the damper blade within 20
seconds.
The activation mechanisms are removable and are interchangeable, for example an actuator operated mechanism
instead of a manually operated mechanism.
Highlights
• Activation types with fitted smoke detector
• Construction with included Grilles
• Tightness class 3C as standard
Summary of Contents for A-FDR-3G-OF
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