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Intumescent Dampers

Abesco Intumescent Dampers are designed to prevent the passage of flame and smoke through or into air movement ventilation ductwork or through air transfer apertures in walls, timber and steel fire doors.

Abesco Intumescent Dampers are manufactured from galvanised channel and comprise horizontal metal blades lined with a heat reactive intumescent material. Abesco Intumescent Dampers are available for circular, rectangular and square ducts and apertures.

Why useWhere to useWhat happens in a fire
  • Meets the requirements of BS5588-9, Sec 6.3 & 6.8
  • Rapid closure in fire conditions
  • Will provide fire protection for over 4 hours
  • Unaffected by moisture or high humidity
  • Non toxic inert materials used throughout
  • Low Maintenance? No mechanical components to maintain

Abesco Intumescent Dampers should be used to prevent the spread of flame and smoke from the room of fire origin to other compartments and escape routes through ventilation ductwork as outlined in method 1 of BS5588-9.

Abesco Intumescent Dampers can also be installed in timber or steel fire doors, fire compartment walls or partitions where such apertures form part of an air distribution system. Dampers installed in such a way should be fitted with a non-vision louvre cover plate, which are also available from Abesco.

In a fire situation, the intumescent material will expand within the damper fully closing the duct or air transfer aperture to the passage of flame and hot smoke to adjacent voids and compartments



Abesco products can be manufactured to meet project specific requirements where standard production specifications may not fulfil all a clients needs. Abesco operates its own fire test furnace and project specific fire testing can be arranged for particular site configurations. Contact us for more details.


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