Self-acting back draught damper FIDi

FIDi is a self-acting back draught damper designed to prevent the spread of combustion gas via the intake air system in ventilation systems. FIDi is equipped with measurement and commissioning functions, thus it can also be used as a adjustment damper.

Quick facts

  • Sizes from Ø 100 to 250 mm
  • Commissioning function
  • Available in MagiCAD


The back draught damper should be used in combination with a fan in use solution, smoke venting via exhaust air or the like and to maintain its function requires the supply air fan to be operational during the fire. The fire protection functions work for all design fire scenarios that can be expected to occur with traditionally used fire development rates. Planning and fire protection analysis are to be made by fire experts.


FIDi has a simple pull-out insert with a membrane that closes very quickly with overpressure in the room. The design of FIDi means that the back draught damper has a low build height, but also that the insert is easy to remove. Removing the insert also allows access for inspection and cleaning of the duct in both directions.



No accessories available for this product