Fire dampers: installation, inspection, and maintenance

Installing, testing and maintaining fire dampers: automatic shut-off of ventilation ducts at every compartment boundary.

Request a quote 06 - 3815 2369

Certified in accordance with

VCA-certified ISO 9001 Kiwa K21050

Trusted by, among others, DNB · WTC Amsterdam · Cooltower · ASML

Ventilation ducts run straight through fire compartments and, without measures, form a direct route for fire and smoke. Fire dampers automatically close off this route as soon as needed.

We handle the entire process: installing fire dampers in new and existing ventilation ducts, in accordance with the installation instructions and within the damper's field of application, with the prescribed installation all round, and then periodically testing and maintaining them according to the manufacturer's instructions. A damper closes automatically when the temperature in the duct rises, via a fusible link or thermal mechanism, or via control from the fire alarm system.

Maintenance is where it goes wrong in practice. A fire damper that has not moved for years often no longer closes fully during a function test. That is why we test every damper, record the outcome per damper and repair or replace whatever does not work - recorded in your logbook, so the inspection is demonstrable.

What you can expect

Installing fire dampers in existing and new ventilation ducts
Automatic closure when temperature rises in the duct
Installation according to the instructions: mortar, mineral wool or an approved dry installation kit
Periodic inspection and function tests, with the outcome recorded per damper
Repair or replacement of dampers that fail the function test

Applications

Ventilation ducts at compartment boundaries Office buildings with mechanical ventilation Industrial climate systems Healthcare and educational buildings Parking garages

Standards & certification

NEN-EN 1366-2 - testing of fire dampers
NEN-EN 13501-3 - classification of fire dampers
NEN-EN 15650 - product standard for fire dampers
Test frequency according to the manufacturer's instructions

Our team works VCA-certified and our organization is ISO 9001 and Kiwa (K21050) certified.

More about our certifications

Costs

What do fire dampers cost?

For fire dampers, the price is determined by the quantity, duct dimensions, installation situation (new duct or retrofit), accessibility above ceilings, and the required perimeter sealing. We offer periodic testing and maintenance as a standalone visit or within a maintenance contract, with the price per damper decreasing as the number increases.

Request an itemized quote First take the quickscan

Common mistakes

Installing the damper without the prescribed installation according to the instructions, so that the fire separation still leaks.
Skipping periodic function tests, allowing a jammed mechanism to go unnoticed.
Boarding up dampers after a renovation or making them inaccessible for inspection.

References

Where we have done this

Including at De Nederlandsche Bank, WTC Amsterdam, Cooltower Rotterdam and ASML Veldhoven - buildings where a rejected fire separation is not an option.

Cooltower Rotterdam

Rotterdam · 2023

Fire-safe compartmentation in a new residential tower of more than 150 metres in the centre of Rotterdam.

View case study

Maanplein Den Haag

Den Haag · 2023

Shafts, toilet waste pipes, heat recovery ducts, water pipes and meter cupboards fire-stopped in a new apartment complex.

View case study

Middin Kijkduin

Den Haag (Kijkduin) · 2025

Fire-resistant floors and walls, penetrations, air ducts, fire dampers and cable trays during the renovation of a building more than a hundred years old.

View case study

All projects

For contractors and installers: Fire-resistant penetrations in non-residential buildings. Or submit a project request directly.

Our approach

This is how we approach it

Survey & quote

We map out the situation and provide a detailed quote with scope and schedule.

Certified execution

Our VCA team carries out the work in accordance with applicable NEN standards, with minimal disruption.

Delivery & logbook

You receive a delivery file and digital logbook, and a maintenance contract if desired.

View our full process

Frequently asked questions

Questions about fire dampers

How often must fire dampers be inspected?

According to the manufacturer's instructions, which differ per type. For the FK2-EU, for example, TROX specifies a function test at least every six months; after two consecutive successful tests the interval may be extended to a year. In some situations, such as with dirty or greasy air, more frequent testing may be needed. If you cannot show during an inspection that the dampers work, the compartmentation at that point has not been demonstrated.

What happens if a fire damper fails the function test?

Then we repair the damper where possible - cleaning, freeing the mechanism, replacing the fusible link - and replace it if that is not enough. The outcome per damper goes into the logbook, including what was done.

Can you install fire dampers in an existing duct?

Yes. The damper is installed in accordance with the installation instructions, with the prescribed installation all round; that installation is part of the damper's field of application and is often forgotten in installations put in by third parties.

Can you also inspect existing dampers?

Yes - inspection, function testing and, where necessary, repair or replacement of existing fire dampers, including those originally installed by another party.

Ventilation ducts with fire dampers in a suspended ceiling

16 September 2026 Maintenance

Fire dampers: how they work, inspection frequency, and common mistakes

A fire damper can be the weakest link in compartmentation if it is not installed correctly or not tested periodically. How it works, and how to check that it still does what it should.