mcr FID 240L Cut-off fire dampers for comfort ventilation systems

Cut-off mcr FID 240L dampers consist of a casing with a rectangular cross-section made of fire-resistant panels, a moving blade and an actuator activated either remotely or automatically thanks to a thermoelectric trigger. Total length of the casing can amount to 310-460 mm, depending on the height of the damper. The blade is made of 60mmthick fire-resistant panel. On the inner side, a sealing system can found. Additionally, stop profiles are fastened to limit the motions of the blade. Damper is typically equipped with steel flange, allowing for adding masking grilles or connecting steel ventilation ducts.

The mcr FID 240L dampers are equipped with an axial actuator with a BFL, BFN, BF-TL return spring, powered by 24 V AC/DC or 230 V AC, with thermoelectric trigger set to 72 °C (optionally it is possible to use triggers with the nominal tripping temperature of 95 °C). The actuators are equipped with limit switches used to monitor the blade position. Furthermore, the mechanical position indicator is placed on the actuator. The thermoelectric trigger is equipped with a test switch.

Dampers with analogue actuators: BFL, BFN or digital BF-TL close thanks to a thermoelectric trigger or power supply cut-off as a result of activating the return spring. The dampers open when the power supply voltage is applied to the actuator terminals. Furthermore, dampers with this kind of actuators can be also opened manually with a key. In case of fire, the damper blade in the fire area opens while remaining closed in the rest of the building - everything happens remotely by supplying voltage.

STRENGHTS

In normal circumstances the damper blade remains open. In case of fire the blade closes automatically or is closed remotely when the power supply is cut off.