Fire Damper Drop Testing and Servicing

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fire_damper-open-jammedDuctwork can transfer flame and smoke very quickly through a building in the event of a fire.

The built-up heat inside a duct can also cause any nearby flammable material to burst into flames.

A fire outbreak can cause considerable damage to your building. Moreover, a fire outbreak will also result in higher insurance claims.

Fire dampers, therefore, are a vitally important part of any ventilation system. Your fire dampers need to be a part of a fire damper maintenance programme to ensure correct operation. Indeed BS9999:2017 Fire Damper Regulations, calls for the following:

  • You should make arrangements for competent specialists to test your fire dampers on completion of installation. Additionally, you should repair/replace fire dampers at least annually if found to b
  • You should test spring-operated fire dampers annually.
  • If you place your fire dampers in dust-laden atmospheres, you should test them more frequently, at periods to suit the degree of pollution.


HTM03-1 also calls for hospitals to test fire dampers every 12 months.

Because of the location of ventilation ductwork all too often this essential work is overlooked. In the course of our duct cleaning work we have witnessed many examples of poor maintenance such as;

  • Collapsed Blades
  • Parted Fusible Links
  • Inoperative Cassettes
  • Corroded Or Jammed Springs
  • Jammed Open With Wood
  • Installed Incorrectly, i.e. Wrong Airflow Direction Or Upside Down

The photographs show a fire damper in the jammed and open position.

Ductbusters will perform a fire damper inspection and “drop test” on all fire dampers, subject to access. Furthermore, we will supply advise on any remedial work that needs to be done so that the “jammed” situation does not occur and the fire integrity of the ductwork system is not compromised.

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