Description
The MDF25 L-M square fire dampers are used as a closure for air ducts in case of fire. When the damper is closed, the spread of fire and the spread of smoke through the duct from one fire compartment to another is prevented. Activation of the damper in case of fire is ensured by a 72 °C thermal fuse as standard. Closure of the damper after activation of the thermal fuse of the thermoelectric actuator is ensured by the closing spring of the actuator. The damper casing, which has a series of perforations to prevent heat transfer, is made of galvanised steel sheet. It is fitted with two inspection holes. The flap sheet is made of calcium silicate plates. The blade rotates on steel pins mounted in bronze bushings. The actuator is fitted with two limit switches. The flapper is designed to minimize pressure loss. The damper is provided with a flange at both ends for connection to the air piping.
Features
CE marking according to EN 15650 certification, classification according to EN 13 501-3 is EI 90/120 S. Tested according to EN 1366-2 at 500 Pa.
Use
The flaps are suitable for installation in all common building structures such as rigid wall structures, lightweight partitions or rigid ceiling structures. The flap can be installed in fire separating construction with the axis of the sheet vertically or horizontally. Fire dampers can only be used for air free of mechanical and chemical impurities. Maximum flow velocity 10 m/s.
Mounting
The fire dampers are designed for square air ducts from 100x200 mm to 800x600 mm (width x height). The axis of the damper must be inside the fire separation structure.
Notice
Fire dampers are dedicated fire safety devices (see the Ministry of Interior decree on fire prevention), therefore it is necessary to comply with the prescribed rules (training of installers, regular operational checks, etc.). Ask for information!
Accessories
- RDH pipe inspection element
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