Is air duct cleaning a legal requirement?

Duct cleaning legal requirements: every rule in one overview

There is no single rule that covers everything. Four types of source together determine what you have to do. The table below shows, per source, what is actually regulated and what is not.

In short: the law says what the result must be (clean air, a working installation, no fire hazard), not how often you must clean. A fixed interval only appears in policy conditions and, as guidance, in standards.

What do the Dutch working conditions rules say about ventilation?

The core is in article 6.2 of the Working Conditions Decree (Arbobesluit). Paragraph 1 states: "Sufficient uncontaminated air is present at the workplace." Paragraph 2 adds that ventilation installations are always in working order. In addition, an installation must have a control system that signals faults, insofar as this is necessary for the health of employees.

For workplaces in buildings, article 6.2 refers, through paragraphs 5 and 6, to the Bbl. The words maintenance and cleaning do not appear in the article. Maintenance only follows indirectly from the requirement that the installation is always in working order: a duct full of dust and dirt does not deliver clean air and does not work as intended.

The Dutch government's Arboportaal gives concrete advice on ventilation: replace dust filters regularly and clean the ducts. That is advice, not a statutory article. On top of this comes the general duty of care in article 3 of the Working Conditions Act (Arbowet): the employer ensures safety and health in all aspects of the work. Anyone who ignores demonstrably contaminated ducts runs into trouble with that duty of care, even without a fixed interval.

Is ventilation system maintenance required in buildings?

Indirectly, yes. The Bbl requires almost every existing building to have a ventilation provision that prevents indoor air from reaching a quality that is harmful to health (art. 3.67 to 3.73). A building must also be kept in good condition: all work needed so that it can continue to perform its function has to be carried out.

An explicit duty to clean ventilation ducts or extraction systems, with a frequency, is not included. The Bbl does contain a duty of care for fire safety in art. 6.4: anyone who knows, or can reasonably suspect, that use of the building may cause a fire must take all reasonable measures to prevent it. For a kitchen duct with grease deposits, that is the most important legal hook.

What it means in practice per building type

• Offices and schools: no interval, but clean air and a working installation are required. More on the practical side in the topic air duct cleaning in offices.
• Hospitality and commercial kitchens: fire safety plus policy conditions. Here an annual inspection is the standard in practice.
• Healthcare: no Dutch statutory interval either; the German guideline VDI 6022 mentions a hygiene inspection every 2 or 3 years and can serve as a reference.

Why the fire insurer enforces cleaning of kitchen extract ducts

For kitchen extraction in hospitality, the policy is stricter than the law. The Goudse prevention conditions for hospitality ask for grease filters that are cleaned or replaced weekly, and for an exhaust duct and motor that are inspected annually and cleaned where needed by a specialist. De Zeeuwse puts it this way: the exhaust duct and the extraction motor are inspected at least once a year and cleaned where needed by the supplier or a specialised company. After a claim you must be able to show proof.

KHN (Royal Dutch Hospitality Association) confirms this picture: the law does not specify how often you must have the extract duct cleaned, but fire insurers do require regular maintenance. And the business owner must maintain the extraction installation and duct in such a way that no fire hazard arises. According to KHN, a cleaning contract alone is not enough proof: you need a report, photographs and a certificate.

If you want to know how this works in a kitchen in practice, continue with kitchen extract duct cleaning. For buildings other than hospitality, the fact check on this page found no policy conditions with a fixed interval: so always check your own policy.

Standard or law: what does EN 15780 mean for the obligation?

EN 15780 is the European standard for the cleanliness of ventilation systems. The 2011 version has been withdrawn and replaced by EN 15780:2025, published on 23 July 2025. The German edition DIN EN 15780:2026-07 extends the scope to commercial kitchen extraction. The standard describes cleanliness classes, how to assess the need for cleaning (visually and with measurements), general guidance on inspection frequency and how to record the result.

In the Netherlands a standard is not a law unless a law or contract refers to it. But if an insurer, client or inspector asks how you assessed cleanliness, EN 15780 is the logical frame of reference. According to trade publications, dust limits per quality class are given as less than 0.6, 3.0 and 4.5 g/m², but these values have not been verified from the text of the standard itself. More background on EN 15780 and VDI 6022 can be found in the standards guide. For practical intervals per building type there is a separate page on how often to clean air ducts.

How accurate are the common claims?

On the websites of cleaning companies you will find firm statements about obligations. We placed the best known claims next to the primary source. The verdict "not demonstrable" means: we found no source for it, so do not present it as fact.

The lesson: for every claim, ask for the statutory article or the policy clause. If it is not given, it is advice or a sales argument.

What this means for cleaning contractors and facilities teams

Precisely because the law gives no interval, there is an opportunity here. Your client wants certainty towards the insurer and the occupational health service. A fixed annual round as a service, with a report as proof, gives them exactly that. It matches what KHN names as proof: report, photographs and certificate.

Checklist for a cleaning round you can prove

1. Record the condition of the duct beforehand with photographs or camera footage.
2. Close off the work area and work with duct sealing balloon, so that loosened dust does not enter the building.
3. Clean mechanically, for example with a rotating brush on the Electric duct brushing machine (ducts of 100 to 600 mm, reach up to 30 metres).
4. Check difficult sections and bends with an compressed air duct cleaning, suitable for ducts from 30 mm.
5. Take new images afterwards and summarise everything in a report with date, location and findings.

If you offer this as a fixed annual round, it becomes a recurring appointment for your client instead of a one-off job. More about setting up air duct cleaning as a service can be found on the page for cleaning contractors. An overview of machines, brushes and extraction is available under duct cleaning kit. Lamers Reinigingstechniek in Zelhem supplies that equipment; you can duct cleaning advice to decide which combination suits the ducts you clean.

How to decide for yourself whether cleaning is needed (without a statutory interval)

Without a fixed statutory interval, you have to make a well founded choice yourself. Use these four questions:

• What does your policy say? Search the prevention conditions for extraction, ducts and inspection.
• What do you see during inspection? KHN points out that serious contamination is often not visible to the naked eye. Camera footage gives certainty.
• What risk do you run? Grease in a kitchen duct is a fire risk; dust in an office duct mainly affects air quality.
• Can you prove it? Keep reports and photographs, so that you have evidence immediately when the insurer or an inspector asks.

Fictional example: a facility manager of an office building with a staff restaurant sees an annual inspection requirement for the kitchen extraction in the policy and no requirement for the office ventilation. So he schedules the kitchen annually and has the office ducts assessed on the basis of inspection. The same reasoning works for any mixed use building: split the installation into parts, link each part to the source that applies to it, and record the decision in writing. More background is available in the guides on ductwork cleaning.