Fire Dampers

Back to Fire Dampers

The WKS25 series fire dampers “applique” for quick installation, suitable for rectangular ducts with base up to 800mm and height up to 600mm, allow maximum security in the prevention of spread of fire in buildings. They guarantee a perfect heat insulation and seal from hot and cold smoke as demonstrated by the various tests carried out in accordance with standard EN 1366-2.
They constitute a barrier from the spread of fire, transfer of heat and spread of harmful fumes and gases because of the use of the seal tested at 500Pa depression, much higher than the minimum required 300Pa as foreseen by standard EN 1366-2. By connecting them to fire and smoke alarm systems, it is possible to anticipate the closing of the damper blade before it comes into direct contact with the flame therefore preventing the onset of indirect damages that may result from the spread of fumes generated by combustion.

Technical data

  • Size range from 100x200mm up to 800x600mm.
  • Casing made of galvanized carbon steel or stainless steel.
  • Top or bottom inspection openings on request.
  • Classified for installation:
    • within rigid walls with fire class up to EI 120 (ve i↔o) S;
    • within plasterboard walls with fire class up to EI 120 (ve i↔o) S;
    • within gypsum blocks walls with fire class up to EI 120 (ve i↔o) S;
    • transfer, without duct connection on one or both sides;
    • for details of the fire resistance classes in function of the type of support and sealing, it is recommended to always refer to the technical manual and the Declaration of Performance.
  • Installation flexibility:
    • installable working on only one side of the wall;
    • installable without sealing materials;
    • installable with vertical or horizontal axis;
    • installable in contact with the ceiling and/or the lateral wall;
    • installable side by side without minimum distance between two fire dampers in the same wall.
  • Fire behaviour:
    • automatic closure in less than 30 seconds when reaching 70 °C;
    • insulation to heat and flame;
    • indifferent to direction of origin of the fire;
    • no thermal bridge between the two wall faces;
    • no thermal bridge between the upstream and downstream ducts.
  • Smoke behaviour:
    • acts as smoke damper both in the absence of fire (cold smoke) and in the presence of fire (hot smoke) tested at 500Pa.
  • Case tightness:
    • class C according to EN 1751, for all sizes, with positive and negative pressure up to 2000Pa.
  • Corrosive environments:
    • salt spray exposure test performed in accordance with EN 60068-2-52 overcome with degree of severity 2.
  • Controls: mechanical, magnetic or motorized.
  • Thermalfuse calibrated at 70 °C or 95 °C.


Fire damper Series WKS25

CE marking according to European Regulation UE 305/2011 and standard EN 15650


Technical Catalog