Fire Damper Testing Requirements: How Often and What's Involved
Fire and smoke dampers are a hidden but critical part of your building's passive fire protection. If they fail to close, fire and smoke can travel unchecked through the ventilation system. This guide explains how often dampers must be tested, what a test involves, and the regulations behind it.
In short: Fire dampers must be tested at least every 12 months by a competent person, with a documented drop test for each damper. Dampers in kitchens and dusty environments need testing every six months. New installations must be tested within a year.
What Is a Fire Damper?
A fire damper is a mechanical device fitted inside ductwork at the point where it passes through a fire-rated wall, floor or ceiling. Its job is to maintain the fire resistance of that compartment line. Ventilation ducts create deliberate openings in fire compartment walls, and without a damper those openings would let fire and smoke spread from one compartment to the next.
Most traditional fire dampers are held open by a fusible link — a small metal element that melts at around 72°C. When the surrounding air reaches that temperature, the link releases and a spring-loaded curtain or set of blades drops to seal the duct.
Types of Damper
Fire Damper
Closes on heat (usually a 72°C fusible link) to stop fire and heat passing through ductwork at a compartment line.
Smoke Damper
Closes on smoke detection, driven by a motorised actuator linked to the fire alarm, to stop smoke spreading via the ventilation system.
Combined Fire/Smoke Damper
Performs both functions — actuator-operated and interfaced with the fire detection system, with thermal release as a backup.
How Often Must Fire Dampers Be Tested?
The recognised standard, BS 9999, and the supporting BESA guidance set out the following testing intervals:
- At least once every 12 months for fire and smoke dampers in normal environments.
- Every six months for dampers in dust-laden or high-risk environments, such as commercial kitchen extract systems.
- Within one year of installation for all newly fitted dampers (commissioning drop test).
- After any alteration to the building, ductwork or fire strategy that could affect the damper.
What Does a Fire Damper Test Involve?
Testing is carried out by a competent person and follows a clear sequence for every damper on site:
1. Locate and access
Each damper is located using drawings and accessed via the duct or an access panel. Where no access hatch exists, one may need to be installed.
2. Drop test
The fusible link is released (or the actuator triggered) and the engineer confirms the blades or curtain close fully to seal the duct.
3. Inspect and clean
The damper is checked for corrosion, obstruction, debris and mechanical damage, and cleaned where required.
4. Reset and record
The damper is reset to its open position and the result, location and any defects are recorded in a test report.
Access Is the Most Common Problem
The single biggest obstacle to damper testing is the lack of access hatches. Many dampers are concealed behind plasterboard, above hard ceilings or deep within duct runs with no way to reach them. A proper survey identifies missing access and is the first step to a compliant testing regime.
Need Your Fire Dampers Tested?
Fyrup carries out fire and smoke damper testing, maintenance and remedial works across London.
The Legal Background
Under the Regulatory Reform (Fire Safety) Order 2005, the responsible person for any non-domestic premises must keep fire safety provisions in efficient working order and good repair. Fire and smoke dampers are explicitly part of those provisions.
In practice, fire damper test certificates are routinely requested during a fire risk assessment, by insurers, and by enforcing authorities. Missing or out-of-date records are a common finding that can hold up compliance sign-off. Damper testing also sits alongside your wider fire stopping and compartmentation regime — both protect the same compartment lines.
Frequently Asked Questions
How often do fire dampers need to be tested?
Fire dampers must be tested at least once a year (every 12 months) under BS 9999 and the BESA TR19 / DW145 guidance. Dampers in dust-laden or high-risk environments such as commercial kitchens should be tested more frequently, typically every six months. Newly installed dampers must be tested within one year of installation and after any building or ductwork alterations.
What does a fire damper drop test involve?
A drop test checks that the damper closes fully and freely. The engineer accesses the damper, releases the fusible link or actuator, and confirms the blades fully close to seal the duct. The damper is then reset and the curtain or blades re-secured. Each damper is logged with its location, condition, test result and any remedial actions in a test report.
Is fire damper testing a legal requirement?
Yes. Under the Regulatory Reform (Fire Safety) Order 2005, the responsible person must ensure fire safety provisions — including fire and smoke dampers — are maintained in efficient working order. BS 9999 sets annual testing as the recognised standard, and fire damper test records are routinely requested by fire risk assessors, insurers and enforcing authorities.
What is the difference between a fire damper and a smoke damper?
A fire damper closes to stop fire and heat passing through ductwork where it crosses a fire-rated wall or floor, usually triggered by a fusible link that melts at around 72°C. A smoke damper closes in response to smoke detection to prevent smoke spreading through the ventilation system. Combined fire/smoke dampers do both and are operated by a motorised actuator linked to the fire alarm.
What happens if a fire damper fails its test?
A failed damper — one that will not close, is seized, obstructed or has a damaged fusible link — is a fire safety defect that must be addressed. The test report should record the failure and the remedial action required, such as cleaning, repair, replacement of the fusible link, or full damper replacement. Failures should be prioritised because a non-functioning damper leaves an open path for fire and smoke.
Who can test fire dampers?
Fire damper testing must be carried out by a competent person with the training, experience and equipment to access, drop test and reset dampers safely. This is usually a specialist passive fire protection or ventilation hygiene contractor. The competent person should provide a documented report suitable for your fire safety records.
Keep Your Dampers Compliant
Fyrup provides fire and smoke damper testing, drop tests, access installation and remedial works to BS 9999 across London. We deliver clear, audit-ready reports for your fire safety records.