WH25 Circular Fire Damper

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​Fire damper WH25 is a circular fire damper with 25mm thick closing blade made from refractory material for air duct system that penetrate fire resistance walls or floors. This circular fire damper has casing leakage performance Class C according to Standard EN1751:2014 section C.3. WH25 circular fire damper prevents fire and smoke from spreading through the air duct system. WH25 circular fire damper is tested and classified in accordance with EN 13501-3 and EN 1366-2 with 500 Pa negative pressure and it is CE marked in accordance with EN 15650.

Fire damper WH25 consists of housing in galvanized sheet steel and damper blade in non-combustible materials, limit switches, electrical spring return actuator and thermal tripping device. It is activated by a heat and/or smoke detector.

Fire damper WH25 has been optimised for small diameter ducts and reduced installation space while it focuses on aeraulic and acoustical performance.​​​​

Related Documents

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​Characteristics of WH25 Fire Damper

  • Casing made from galvanised carbon steel
  • Air duct connection gasket - Lindab safe
  • Thermal labryinth obtained from the casing
  • Intumescent sealing gasket
  • 25mm thick closing blade made from refractory material
  • Opening/closing mechanism with IP42 protection box (IP54 for motorised version)
  • Internal intumescent gasket for hot smoke seal
  • Lip seal on blade border for cold smoke seal


European Standards and Certification

  • CE Certification - EN 15650
  • Test - EN 1366-2
  • Classification - EN 13501-3
  • Thermal Fuse Reliability - ISO 10294
  • Air Tightness - EN 1751
  • Resistance to Corrosive Environments - EN 60068-2-52
  • CE Certificate of Constancy of Performance
  • German Approval
  • NF Certification
  • Swiss Approval
  • Swedish Approval
  • Fire Resistance Classification According to EN 13501-3-2009